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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260513T150000
DTEND;TZID=Australia/Sydney:20260513T160000
DTSTAMP:20260520T021545
CREATED:20260503T233334Z
LAST-MODIFIED:20260507T002040Z
UID:18802-1778684400-1778688000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Georgios Paraschos (University of Turku)
DESCRIPTION:Shocks\, polarisation\, and high-energy emission: Probing black hole jets from VLBI to IXPE\n\nAbstract: \n\nRelativistic jets launched by accreting supermassive black holes are fundamental drivers of feedback in galaxies\, yet the location and mechanisms responsible for high- energy γ-ray emission remain uncertain. I will present recent multimessenger studies combining VLBI imaging\, IXPE X-ray and optical polarimetry\, γ-ray monitoring\, and neutrino observations of blazars undergoing major flaring events. These coordinated campaigns reveal shock–shock interactions in the parsec-scale jet\, conditions favourable for hadronic emission\, and γ-ray production occurring well downstream of the central engine. I will discuss these results in the context of our broader efforts with the Event Horizon Telescope to directly probe the physical conditions governing jet formation and high-energy radiation near supermassive black holes. Finally\, I will touch upon the collaborative work planned with colleagues at the ATNF. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-georgios-paraschos-university-of-turku/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2026/05/BU_ALL_Paraschos-scaled.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Perth:20260506T120000
DTEND;TZID=Australia/Perth:20260506T130000
DTSTAMP:20260520T021545
CREATED:20260430T030155Z
LAST-MODIFIED:20260430T030300Z
UID:18796-1778068800-1778072400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Prof Yihua Yan (National Astronomical Observatories\, Chinese Academy of Sciences)
DESCRIPTION:Overview on Chinese Meridian Project – Solar and Heliospheric Radio Studies at Mingantu Observing Station\n\nAbstract: \n\nThe Chinese Meridian Project (CMP) is a Ground‐based Space Environment Monitoring Network which includes the Space Environment Monitoring System. The system adopts a well‐designed monitoring architecture\, known as “One Chain\, Three Networks\, and Four Focuses” to achieve stereoscopic and comprehensive monitoring of the entire solar-terrestrial space. The “One‐Chain” component utilizes optical\, radio\, interplanetary scintillation\, and cosmic ray instruments to cover the causal chain of space weather disturbances from the solar surface to near‐Earth space. For the ionosphere\, middle and upper atmosphere\, and geo-magnetic field\, instruments are deployed along longitudes of 120o and 100oE\, and latitudes of 30o and 40oN\, forming the “Three Networks”. Furthermore\, more powerful monitoring facilities or large‐scale instruments have been deployed in four key regions: the high-latitude polar region\, mid‐latitude region in northern China\, low‐latitude region at Hainan Island\, and the Tibet region. These four regions are crucial for disturbances propagation and evolution\, or possess unique geographical and topographical characteristics. \n\nThe Mingantu Observing Station\, which is located about 400km northwest of Beijing with the wide‐band spectral radioheliographs and the interplanetary scintillation telescopes\, constitutes a key component of CMP for tracking and monitoring solar eruptions from the Sun’s atmosphere into interplanetary space. Here we give an overview on CMP and introduce the progress on solar and heliospheric radio studies at Mingantu Observing Station. \n\nPlease note that the event timezone is AWST (UTC+8 hrs) \n\nLocation\n\nOrganiser\n\n\n \n\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-prof-yihua-yan-national-astronomical-observatories-chinese-academy-of-sciences/
LOCATION:CSIRO – Kensington\, Australian Resources Research Centre (ARRC)\, 26 Dick Perry Ave\, Kensington\, WA\, 6101\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2026/04/yihua_yan.jpeg
ORGANIZER;CN="Gemma Anderson":MAILTO:gemma.anderson@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260408T150000
DTEND;TZID=Australia/Sydney:20260408T160000
DTSTAMP:20260520T021545
CREATED:20260330T022844Z
LAST-MODIFIED:20260330T023210Z
UID:18562-1775660400-1775664000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Georgia Stewart (University of Tasmania)
DESCRIPTION:Echoes of the Dying Light: The Evolution and Spectral Signatures of Simulated Remnant Radio Galaxies\n\nAbstract: \n\nRadio galaxy remnants are the quiescent phase of radio-loud active galactic nuclei (RLAGN) and provide key insight into AGN duty cycles and feedback. Observationally\, remnants are challenging to identify\, as their spectral and morphological properties often overlap with active sources\, necessitating multi-frequency data. \n\nIn my PhD\, I worked on the largest suite (to-date) of three-dimensional hydrodynamic simulations of active and remnant RLAGN evolving in realistic environments. Using synthetic radio emission generated from these simulations\, I investigated how jet power\, environment\, and active-phase duration shape the dynamics\, spectral evolution\, and observability of remnants. I showed that low-density environments delay the transition to buoyancy\, and high-powered sources sustain forward shocks that continue heating their surroundings. I also find several trends in the spectral evolution of remnants that are dependent on environment properties. \n\nI further explore remnant identification using machine learning on simulated radio data\, finding that even simple models can distinguish active and remnant sources\, though younger remnants are harder to classify. Finally\, I introduce a new method to calculate radio and X-ray observables directly from simulations\, enabling detailed\, high-resolution studies of lobe emission and its interaction with the environment. \n\nThese results provide a theoretical framework to interpret current and upcoming low-frequency surveys and improve our understanding of the lifecycle and impact of RLAGN. \n\n \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-georgia-stewart-university-of-tasmania/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2026/03/talk_graphic_G_Stewart-scaled.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Perth:20260401T120000
DTEND;TZID=Australia/Perth:20260401T130000
DTSTAMP:20260520T021545
CREATED:20260325T192708Z
LAST-MODIFIED:20260401T043523Z
UID:18536-1775044800-1775048400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Yuxiang Qin (Australian National University)
DESCRIPTION:Inferring properties of the first galaxies and intergalactic medium with 21-cm cosmology\n\nAbstract: \n\nThe redshifted 21-cm signal provides a unique probe of the first galaxies and their imprint on the thermal and ionization state of the intergalactic medium (IGM) during the Cosmic Dawn and Epoch of Reionization. In this talk\, I present a unified inference framework that jointly interprets constraints from low-frequency interferometers (e.g.\, HERA and MWA) and global-signal experiments such as EDGES\, in combination with complementary galaxy and CMB observations. \n\nBy jointly modelling these datasets\, we find converging evidence that the IGM was heated early\, ruling out a broad class of cold reionization scenarios and placing new constraints on the X-ray emissivity of the first galaxies. Within a galaxy-driven framework\, these results imply enhanced high-redshift X-ray production relative to local scaling relations\, potentially driven by metal-poor stellar populations and their remnants. In parallel\, global-signal analyses provide independent constraints on the timing and amplitude of the cosmic dawn signal\, and serve as a critical test of its astrophysical interpretation. \n\nAs these early sources are likely beyond the reach of direct detection\, even for facilities such as JWST\, the 21-cm signal remains a uniquely powerful probe of their collective impact. Looking ahead\, I will show how the Square Kilometre Array (SKA) will transform this field\, enabling precision constraints on the thermal history of the IGM and the properties of the first galaxies. \n\nPlease note that the event timezone is AWST (UTC+8 hrs) \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-yuxiang-qin-australian-national-university/
LOCATION:CSIRO – Kensington\, Australian Resources Research Centre (ARRC)\, 26 Dick Perry Ave\, Kensington\, WA\, 6101\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2026/03/yuxiang_qin_apad-1.jpg
ORGANIZER;CN="Gemma Anderson":MAILTO:gemma.anderson@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260331T150000
DTEND;TZID=Australia/Sydney:20260331T160000
DTSTAMP:20260520T021545
CREATED:20260325T234343Z
LAST-MODIFIED:20260325T234343Z
UID:18544-1774969200-1774972800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Valentina Di Marco (University of Melbourne)
DESCRIPTION:All Models Are Wrong: Noise Modelling in Pulsar Timing\n\nAbstract: \n\nPulsar timing arrays\, like any experiment\, depend on accurate noise modelling to detect nanohertz gravitational waves. But the noise itself is much more complex than in some other experiments. It is multi-component and\, due to the astrophysical origin of several noise processes\, often uncertain and difficult to model accurately. In this talk\, I explore what happens when our noise models are wrong. \n\nI show that misspecified noise can bias gravitational-wave inference and distort spectral estimates. While these effects are sometimes conservative\, they can also lead to systematically incorrect conclusions\, highlighting the need to account for model uncertainty properly. \n\nI then present a transdimensional Bayesian approach for noise analysis that lets the data decide which noise processes are present in the signal. By jointly performing model selection and parameter estimation\, this framework provides a more robust and statistically consistent way to analyse pulsar timing data. \n\nPlease note that the event timezone is AEDT (UTC+11 hrs) \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-valentina-di-marco-university-of-melbourne/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2026/03/Valentina_DiMarco.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260326T120000
DTEND;TZID=Australia/Sydney:20260326T130000
DTSTAMP:20260520T021545
CREATED:20260325T234550Z
LAST-MODIFIED:20260325T234550Z
UID:18546-1774526400-1774530000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Matt Miles (Vanderbilt University)
DESCRIPTION:All Models Are Wrong: Noise Modelling in Pulsar Timing\n\nAbstract: \n\nPulsar timing arrays are only as good as the timing residuals they produce — and those residuals are only as clean as the method used to extract them. Traditional template-matching approaches measure pulse time-of-arrival (TOA) by fitting a single fixed or radio-frequency dependent template to observed profiles\, but this leaves a critical vulnerability: any stochastic variation in pulse shape is silently absorbed into the TOA as a systematic bias\, quietly corrupting the signals we are trying to extract. \n\nSCULPT is a new technique built of old ideas that fixes this at its source. By constructing a basis directly from observed profiles via SVD\, SCULPT learns the true structure of pulse shape variability from the data itself — no analytic assumptions\, no oracle knowledge required. Stochastic shape changes are absorbed into nuisance amplitude coefficients within this basis\, keeping them out of the timing solution. The result is a variational profile basis that is optimally adapted to the actual pulse morphology: expressive where it needs to be\, simple everywhere else. \n\nI will present the methodology behind this process and explore with the audience what it is we’re trying to achieve and why it’s an important goal. \n\nPlease note that the event timezone is AEDT (UTC+11 hrs) and will be held in the Faraday room \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-matt-miles-vanderbilt-university/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2026/03/SCULPTGraphic_ManimCE_v0.20.1.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260325T120000
DTEND;TZID=Australia/Sydney:20260325T130000
DTSTAMP:20260520T021545
CREATED:20260319T101801Z
LAST-MODIFIED:20260319T102254Z
UID:18378-1774440000-1774443600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Luca Ighina (Harvard Center for Astrophysics)
DESCRIPTION:A New Radio Window on the Growth of the First Supermassive Black Holes\n\nAbstract: \n\nFrom reionizing the Universe to quenching star formation in massive galaxies\, accreting supermassive black holes (SMBHs)\, or active galactic nuclei (AGN)\, are thought to play a pivotal role in early galaxy evolution. Growing observational evidence\, including recent results from JWST\, suggests that accreting black holes are both more abundant and more massive at than predicted by current theoretical models. In this talk I will present recent observational results on accreting black holes in the early Universe\, with a particular focus on radio-powerful AGN. I will show how relativistic jets can play an important role in both the rapid assembly of very massive black holes and the regulation of star formation in their host galaxies in the early Universe.  \n\nWhile exciting\, current studies focus on optically luminous AGN\, which likely represent only the tip of the iceberg of the SMBH population at early cosmic times. Heavily obscured AGN\, whose accretion signatures are hidden at optical and near-infrared wavelengths\, are predicted to dominate the high-z AGN population\, yet these sources remain largely unconstrained from an observational point of view. The synergy between next-generation radio and near-infrared wide-area surveys will soon open a new window on this elusive population. In particular\, radio observations can reveal the presence of relativistic jets\, and therefore ongoing black hole accretion\, even in systems that are obscured at optical wavelengths. The combination of ASKAP/EMU and EUCLID-wide surveys will provide the deepest multi-wavelength view of the extra-Galactic southern sky\, enabling the construction of the first large\, unbiased census of accreting black holes at z>6. As an example of the power of this synergy\, I will present a preliminary cross-match of EMU and Euclid over the EUCLID deep field South (∼25 deg2). \n\nPlease note that the event timezone is AWST (UTC+8 hrs) \n\n \n\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-luca-ighina-harvard-center-for-astrophysics/
LOCATION:CSIRO – Kensington\, Australian Resources Research Centre (ARRC)\, 26 Dick Perry Ave\, Kensington\, WA\, 6101\, Australia
CATEGORIES:Colloquia
ORGANIZER;CN="Gemma Anderson":MAILTO:gemma.anderson@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260312T120000
DTEND;TZID=Australia/Sydney:20260312T130000
DTSTAMP:20260520T021545
CREATED:20260306T042802Z
LAST-MODIFIED:20260306T042802Z
UID:17980-1773316800-1773320400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Eric Burt (NASA/JPL\, 2025 IEEE Distinguished Lecturer on Frequency Control)
DESCRIPTION:Frequency Standard Contributions to Limitations on the Signal-to-Noise Ratio of Very Long Baseline Interferometry Observations\n\nAbstract: \n\nSince its observation in 2019\, the first image of a super-massive black hole using Very Long Baseline Interferometry (VLBI) between a network of Earth-based radio telescopes has generated much scientific and public interest\, including the possible extension to include one or more space-based radio antennas in order to obtain higher image resolution.  The VLBI technique assumes that each radio telescope has its own frequency standard or “clock\,” and a key requirement for that frequency standard is that it have sufficient stability and precision to enable the phase-coherent combination of signals from the independent radio telescopes.  For ground-based radio telescopes\, the state-of-practice is to have a hydrogen maser co-located.  The number of frequency standards that are both space-qualified and perform well enough for this type of VLBI is a small subset of those available on the ground.  Among these\, it will be necessary to determine what type of frequency standard performance is really required.  In addition\, given the high cost of launching instruments into space\, it may be necessary to make difficult trade-offs between instrument size\, and performance.  To facilitate this trade space\, we derive a metric that directly links frequency standard noise characteristics to the signal-to-noise (S/N) ratio as a function of averaging time for the central VLBI observable\, known as the “visibility.”  Using this metric\, we find that among the existing space clock candidates\, only an Ultra-Stable Oscillator (USO) and space hydrogen maser are potentially viable.  Furthermore\, a USO will only be effective for relatively short integration times for the high observational frequencies required\, which are typically of order 100 GHz or higher.  While a hydrogen maser can extend the averaging time\, it is likely to have prohibitive size and cost for a space VLBI node.  We also investigate emerging frequency standards\, including optical clocks\, and find that the best option may be the optical local oscillator used in an optical clock by itself without the atomic reference.  This approach can greatly reduce size and complexity of the frequency standard by eliminating the atomic reference while providing a limit on VLBI visibility S/N significantly higher than what is possible with a hydrogen maser. \n\nPlease note that the event timezone is AEDT (UTC+11 hrs)\, and it will be held at Payne Scott room instead of the lecture theatre. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-eric-burt-nasa-jpl-2025-ieee-distinguished-lecturer-on-frequency-control/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2026/03/2025RS008476_fig_12-scaled.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260225T120000
DTEND;TZID=Australia/Sydney:20260225T130000
DTSTAMP:20260520T021545
CREATED:20260224T064725Z
LAST-MODIFIED:20260224T065328Z
UID:17584-1772020800-1772024400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Joe Grundy (Curtin University)
DESCRIPTION:Investigating the Complex Radio Spectra and Infrared-Radio Correlation in Nearby Starforming Galaxies\n\nAbstract: \n\nIn my recently accepted thesis\, I examined the radio continuum emission of galaxies to determine how the physical processes that occur within galaxies modify the radio spectral energy distribution and physical distribution of radio emission. I studied the resolved radio continuum emission of 27 nearby star forming galaxies with facilities including MWA\, ASKAP\, ATCA and ALMA to examine the impact of cosmic ray electron energy loss and radio continuum absorption mechanisms as well as cosmic ray transport on the radio spectral energy distribution and their relations to a galaxies physical properties. I have also examined the relationships between radio continuum emission and star formation through the infrared to radio correlation and how these relationships are affected by physical processes within galaxies. Overall I find that the radio continuum emission of star forming galaxies is much more complex than simple two component synchrotron and free-free power law emission with factors such as ionisation losses\, synchrotron losses and free-free absorption impacting the radio emission differently in each galaxy depending on a galaxies size\, star formation rate and gas properties. A thorough understanding of the links between the physical properties of a galaxy and its radio spectral energy distribution is vital to be able to better calibrate radio star formation rate measures in preparation for future broad-band\, all-sky radio surveys with telescopes like the SKA. \n\nPlease note that the event timezone is AWST (UTC+8 hrs) \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-joe-grundy-curtin-university/
LOCATION:CSIRO – Kensington\, Australian Resources Research Centre (ARRC)\, 26 Dick Perry Ave\, Kensington\, WA\, 6101\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2026/02/joe_grundy_apad.png
ORGANIZER;CN="Gemma Anderson":MAILTO:gemma.anderson@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260204T150000
DTEND;TZID=Australia/Sydney:20260204T160000
DTSTAMP:20260520T021545
CREATED:20260129T232023Z
LAST-MODIFIED:20260129T232024Z
UID:16754-1770217200-1770220800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Kovi Rose (University of Sydney) 
DESCRIPTION:Probing the Timescales of Radio Variability: From Late-time Supernovae Re-Brightening to Long Period Transients\n\nAbstract: \n\nWe have entered the age of big data in astrophysics and radio astronomy is no exception. Wide-field surveys with the Australian SKA Pathfinder (ASKAP) radio telescope are finding millions of radio-bright sources in the southern skies. In this talk I will speak about three recent discoveries and their implications on our understanding of stellar magnetism in fully convective stars\, binary evolution in accreting systems\, and the mass-loss history of supernova progenitors. The first comes from our detection of periodic bursts from an ultracool brown dwarf\, the latest spectral type star ever found to produce radio emission. Second\, we have found orbitally-modulated X-ray and radio pulses from a newly discovered long period transient. And finally\, we are finding supernovae re-brightening years after their optical discovery\, as the blast wave interacts with shells of circumstellar material. Finding and studying these rare transients is helping us explore astrophysical environments that cannot be studied on Earth. \n\nPlease note that the event timezone is AEDT (UTC+11 hrs) \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-kovi-rose-university-of-sydney/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2026/01/accreting_WD_visual-scaled.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260128T150000
DTEND;TZID=Australia/Sydney:20260128T160000
DTSTAMP:20260520T021545
CREATED:20260122T040557Z
LAST-MODIFIED:20260122T040557Z
UID:16698-1769612400-1769616000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Ashna Gulati (University of Sydney) 
DESCRIPTION:From Jets to Mergers: Multiwavelength Signatures of Synchrotron Transients\n\nAbstract: \n\nSynchrotron transients arise from some of the most energetic explosions in the Universe and trace the interaction of relativistic or sub-relativistic outflows with their surrounding environments. These interactions generate shocks that accelerate particles and amplify magnetic fields\, producing broadband synchrotron emission. While the underlying emission mechanism is broadly similar across sources\, differences in progenitor systems give rise to a wide range of outflow velocities\, energies\, and light-curve behaviours. Broadband observations are therefore a powerful tool for probing the physics of these extreme events\, from compact object interactions to stellar explosions. \n\nIn this talk\, I present results from three complementary approaches to studying synchrotron transients: targeted wide-field radio surveys\, untargeted extreme transient searches\, and rapid response follow-up. I discuss late-time ASKAP searches for radio afterglows from compact object mergers detected by LIGO–Virgo\, the discovery and detailed characterisation of the luminous and long-lived extragalactic radio transient ASKAP J0055–2558\, and a comprehensive radio-to-X-ray study of the exceptionally bright GRB 240825A. Together\, these studies demonstrate how broadband observations enable robust constraints on relativistic outflows and establish radio surveys and electromagnetic follow-up as a critical tool for exploring the extreme transient Universe in the SKA era. \n\nPlease note that the event timezone is AEDT (UTC+11 hrs) \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-ashna-gulati-university-of-sydney/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2026/01/A_gulati_colloquium.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20251203T120000
DTEND;TZID=Australia/Sydney:20251203T130000
DTSTAMP:20260520T021545
CREATED:20251118T071516Z
LAST-MODIFIED:20251127T060200Z
UID:16181-1764763200-1764766800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Sam Taziaux (Ruhr University Bochum)
DESCRIPTION:MEDUSA  — Magnetic-field Evolution in Dwarf galaxies from Ultra-deep SKA Analysis  \n\n\nAbstract: \n\nDwarf galaxies are an important class of galaxies\, which are known to serve as proxy for the early Universe and play a crucial role in the formation and evolution of larger galaxies. To understand the underlying emission mechanism and the physics that drive the radiation far away from their origin\, we perform radio continuum polarimetry studies using deep MeerKAT observations. With the MEDUSA (Magnetic field Evolution in Dwarf galaxies Using SKA Analysis) project\, we present to-date the largest radio polarimetry study of dwarf galaxies\, including HI kinematics. Analysis of the spectrum reveals potential energy losses with rapid dissipation of electrons over kiloparsec scales\, a phenomenon contrasting sharply with observations from grand spiral galaxies. Furthermore\, small-scale dynamos in the star-fomation knots and a correlation between the level of depolarisation and the star formation histories deepen the understanding of this low mass systems. These findings provide evidence of intense material feedback into the intergalactic medium\, a process expected to be prevalent in the protogalaxies of the early Universe.  \n\nPlease note that the event timezone is AWST (UTC+8 hrs) \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\n \n\n \n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-sam-taziaux-ruhr-university-bochum/
LOCATION:26 Dick Perry Ave\, Kensington WA 6151\, 26 Dick Perry Avenue\, Kensington\, Washington\, 6151
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2025/11/sam_taziaux_apad.png
ORGANIZER;CN="Gemma Anderson":MAILTO:gemma.anderson@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20251126T150000
DTEND;TZID=Australia/Sydney:20251126T160000
DTSTAMP:20260520T021545
CREATED:20251123T222415Z
LAST-MODIFIED:20251123T222416Z
UID:16208-1764169200-1764172800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Jennifer West (Dominion Radio Astrophysical Observatory)
DESCRIPTION:Is the heliopause seen in radio synchrotron emission?\n\nAbstract: \n\nDiffuse radio synchrotron emission originating in the Milky Way fills the entire sky\, even at high Galactic latitudes. The emission is highly linearly polarised\, and comes from high energy CRs moving in the Galaxy’s magnetic field. Planck has measured the orientation of this emission and has mapped the magnetic field pattern across the sky\, however\, we do not know if the origin of the pattern is distant (tracing the large-scale magnetic field) or nearby (tracing the Local Bubble\, a massive superbubble where our Sun now resides). The reality is the emission must originate at a wide range of distances. In this talk\, I will present evidence that some of this emission has its origin in the interaction between the heliopause and the very local interstellar magnetic field. The emission is polarised\, and traces the local interstellar magnetic field as it wraps around the heliosphere at the heliopause boundary\, which is related to the Sun’s motion through space\, and which has previously been revealed through a bright ribbon of emission detected by NASA’s Interstellar Boundary Explorer (IBEX). \n\nPlease note that the event timezone is AEDT (UTC+11 hrs) \n\n \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-jennifer-west-dominion-radio-astrophysical-observatory/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2025/11/PastedGraphic-1.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20251121T110000
DTEND;TZID=Australia/Sydney:20251121T120000
DTSTAMP:20260520T021545
CREATED:20251117T221855Z
LAST-MODIFIED:20251120T051718Z
UID:16167-1763722800-1763726400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Anna Ivleva (Observatory of Munich / Ludwig Maximilian University)
DESCRIPTION:Odd Radio Circles (ORCs): probing radio features at group scales with simulations\n\nAbstract: \n\nExtragalactic radio astronomy has proven to be immensely useful in the study of high energy particle physics by constraining the acceleration of cosmic ray electrons and their subsequent synchrotron emission. Investigations of galaxy clusters have shown to be particularly fruitful\, since such massive environments grant favourable conditions for efficient particle acceleration via merger driven shocks. Yet\, a new class of radio objects discovered only a few years ago imposes the question if also merger shocks in less massive systems can accelerate CR electrons to GeV energies. Specifically\, a growing number of observations is pointing towards the existence of ringlike features around small galaxy groups  and even Milky Way-like objects\, accordingly titled Odd Radio Circles (ORCs). Recent works have proposed that these could be interpreted as radio analogs to the merger shocks observed in more massive systems. However\, ORCs are appearing in a colder and less magnetized medium than the radio features in galaxy clusters\, challenging particle acceleration  mechanisms in more constraining environments. Now\, by interpreting multiple observed ORCs at different stages as an evolutional time sequence and comparing them to simulations of such systems\, one can infer underlying properties of these unique features\, while simultaneously testing the limits of diffusive shock acceleration (DSA). To this end\, I will present the first of its kind magnetohydrodynamical simulation of a galaxy group\, utilising on-the-fly treatment of spectral cosmic rays. I will study the emerging radio features and discuss both similarities and differences to the observed counterparts. Finally\, I will review the relative importance of DSA in the formation of ORCs compared to galactic sources of high energy particles\, such as supernovae and AGN. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-anna-ivleva-observatory-of-munich-ludwig-maximilian-university/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2025/11/talk_graphic.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20251118T150000
DTEND;TZID=Australia/Sydney:20251118T160000
DTSTAMP:20260520T021545
CREATED:20251116T222856Z
LAST-MODIFIED:20251116T222856Z
UID:16142-1763478000-1763481600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Jordan Collier (Australian SKA Regional Centre)
DESCRIPTION:Science with the AusSRC: Building on the Precursors Towards the SKA\n\nAbstract: \n\nThe Australian SKA Regional Centre (AusSRC) is Australia’s portion of the international SKA Regional Centre Network (SRCNet)\, which aims to establish and build capability to support the Australian and international SKA science communities\, thereby ushering in the next era of astronomical discovery and advanced data processing.  This presentation will cover AusSRC’s science support\, with highlights from our current SRCNet activities and current round of Australian SKA precursor support\, including visibility compression\, and the development and implementation of science workflows for representative SKA science\, with particular focus on visualisation and analysis capabilities within the Cube Analysis and Rendering Tool for Astronomy (CARTA). A summary will be presented of our future plans\, in transitioning toward supporting SKA science verification. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-jordan-collier-australian-ska-regional-centre/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2025/11/image-2025-9-10_22-14-11-scaled.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20251112T150000
DTEND;TZID=Australia/Sydney:20251112T160000
DTSTAMP:20260520T021545
CREATED:20251110T011649Z
LAST-MODIFIED:20251110T011650Z
UID:16115-1762959600-1762963200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Dan Rybarczyk (University of Wisconsin-Madison)
DESCRIPTION:New constraints on CO-dark molecular gas properties in the diffuse ISM: Insights from 21cm and 3mm absorption observations\n\nAbstract: \n\nThe evolution of the multiphase interstellar medium (ISM) drives galaxy evolution. The transition from diffuse atomic gas to denser molecular clouds sets the initial conditions for star formation\, so plays a critical role in this evolution. However\, since molecular hydrogen (H2) is invisible in many diffuse environments\, observational constraints on the atomic-to-molecular transition remain limited. CO emission is often used to trace H2\, but in the diffuse ISM\, a significant fraction of H2 is not associated with any CO emission (the “CO-dark” molecular gas). Thankfully\, HCO+ absorption at 3mm is an excellent tracer of diffuse molecular gas — with a stable abundance and formation/survival at low column density\, HCO+ is a reliable probe of the H2 column density in the diffuse ISM. Here we report observations of HI\, HCO+\, and CO in absorption toward five diffuse lines of sight. In all of these directions\, we detect a kinematically broad\, CO-dark signature in HCO+ absorption that is associated with nearly all the cold atomic gas in these directions. We constrain the CO abundances in these directions\, which are consistent with chemical model predictions and account for the non-detection of CO. In fact\, we show that CO emission or absorption are unlikely to be detected where N(H2) < 7E19 cm^-2\, while HCO+ absorption is readily detected for N(H2) > ~fewE18 cm^-2\, opening an important window on the HI-to-H2 transition. The diffuse\, CO-dark gas associated with broad HCO+ absorption has systematically different properties\, including a lower fraction of cold atomic gas and a lower molecular fraction\, than CO-bright gas. These observations therefore offer insights on the HI-to-H2 transition that are inaccessible with CO observations.  I will briefly discuss future work aimed at uncovering the spatial structure of this diffuse\, partially-molecular gas — key to understanding the physics of this critical stage of galaxy evolution. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-dan-rybarczyk-university-of-wisconsin-madison/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2025/11/3C111_absorption.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20251105T150000
DTEND;TZID=Australia/Sydney:20251105T160000
DTSTAMP:20260520T021545
CREATED:20251103T032208Z
LAST-MODIFIED:20251103T032208Z
UID:16080-1762354800-1762358400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Michael Busch (NRAO)
DESCRIPTION:OH as a Tracer of “CO-Dark” Gas in the Interstellar Medium Near and Far\n\nAbstract: \n\nMolecular clouds are the birthplace of stars. It is unfortunate then that the most abundant interstellar molecule\, molecular hydrogen (H2)\, is practically invisible in cold molecular clouds (T<100K). Astronomers typically use the second most abundant molecule\, carbon monoxide (CO)\, to trace the bulk distribution of H2 in our galaxy and many others because of its relative brightness and abundance. CO observations alone\, however\, fail to trace a significant amount of molecular gas\, known as “CO-dark” molecular gas. In this talk\, I will review the observational evidence for the existence of a significant amount of “CO-dark” gas in the galaxy\, then recount the efforts in the 2010s to use OH with the Green Bank Telescope (GBT) to observe the “CO-dark” gas in the Outer galaxy (Busch et al. 2019\, 2021). Then I will present recent results on an extremely sensitive pilot survey for 18cm OH emission towards the southern disk of the Andromeda Galaxy\, in which trace the large-scale galactic “CO-Dark” molecular gas with the GBT (Busch 2024). A follow-up Andromeda survey is presented. I will discuss recent efforts in combining HCO+ absorption in the diffuse ISM with OH emission to understand the properties of diffuse molecular gas in the ISM and conclude on future work with collaborators in Australia regarding OH as a tracer of “CO-dark” gas. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-michael-busch-nrao/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2025/11/ColumnDensityHNucleiM31.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20251027T150000
DTEND;TZID=Australia/Sydney:20251027T160000
DTSTAMP:20260520T021545
CREATED:20251026T222558Z
LAST-MODIFIED:20251026T222559Z
UID:16012-1761577200-1761580800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Jessica Dempsey (ASTRON / SKAO)
DESCRIPTION:Learning in low frequency: Charting a path for SKA from LOFAR and ASTRON\n\nAbstract: \n\nLOFAR is one of the highest-impact Observatories on the planet. I will discuss its achievements\, technical and scientifically and how vital the path to LOFAR has been\, and will be\, for SKA-Low success. LOFAR2.0 is currently finishing construction and will be operational at the end of 2026. I will show the benefits of aligning the parallel projects\, both scientifically and technically\, and the crucial role the community can play in accelerating the success of both telescopes\, as well as other ASTRON technology initiatives with strong future synergies with next-generation Australian radio astronomy plans. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-jessica-dempsey-astron-skao/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2025/10/Colloq-27102025-scaled.jpg
ORGANIZER;CN="Joshua Preston Pritchard":MAILTO:joshua.pritchard@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20251022T150000
DTEND;TZID=Australia/Sydney:20251022T160000
DTSTAMP:20260520T021545
CREATED:20251020T225636Z
LAST-MODIFIED:20251020T225637Z
UID:15989-1761145200-1761148800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Kelly Gourdji (ATNF)
DESCRIPTION:Revisiting GW170817 at milliarcsecond scale: high-precision constraints on jet geometry and Hubble’s constant\n\nAbstract: \n\nThe historic detection of gravitational waves from the electromagnetically bright binary neutron star merger GW170817 enabled the first standard siren measurement of Hubble’s constant (H0). The accuracy and precision of this measurement depends crucially on how well the merger inclination angle is constrained\, given its strong covariance with luminosity distance. Modeling the light curve of the jet’s afterglow provides constraints on inclination\, but is highly dependent on the similarly uncertain jet opening angle. Past studies have improved on this by invoking high-resolution radio observations\, obtained through very long baseline interferometry\, to constrain the viewing angle. In this talk\, I will present our Bayesian visibility-plane model-fitting framework that provides a more informed and robust measurement of the viewing geometry of GW170817\, by including all relevant data\, robustly handling systematic uncertainties\, rigorously sampling model parameter space and using new hydrodynamical jet models. We extend our framework to fit for H0 directly\, and consider various plausible peculiar velocity corrections to present a new and improved standard siren measurement of H0. Strikingly\, we find our result to be in better agreement with one of the two precise and independent H0 measurements that are famously in tension. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-kelly-gourdji-atnf/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2025/10/colloq_20251022.png
ORGANIZER;CN="Joshua Preston Pritchard":MAILTO:joshua.pritchard@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20251015T150000
DTEND;TZID=Australia/Sydney:20251015T160000
DTSTAMP:20260520T021545
CREATED:20251013T225020Z
LAST-MODIFIED:20251013T225021Z
UID:15937-1760540400-1760544000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Ben Stappers (Jodrell Bank / University of Manchester)
DESCRIPTION:Hunting FRBs and Transients with MeerTRAP \n\nAbstract: \n\nMeerTRAP (more TRAnsients and Pulsars) is a fully commensal program running on the MeerKAT telescope to search for transients including FRBs and radio emitting neutron stars. It utilises the excellent sensitivity and wide bandwidth of the MeerKAT telescope to enable it to see faint/distant sources both inside and outside our Galaxy. I will describe the MeerTRAP experiment including our real time analysis systems and our transient buffer which allows us to localise FRBs. I will present some highlights of the FRBs that we have discovered so far including some which have been localised and have associated (high) host galaxy redshifts. I will also present some results on the two repeating FRBs that we have identified. MeerTRAP works with the MeerLICHT optical telescope to undertake simultaneous observations and I will present the latest results from those studies. MeerTRAP has also discovered more than 100 new Galactic transients and I will summarise their properties and discuss some of the particularly interesting sources\, especially those with longer than typical pulsar spin periods. I will also present the detection of a particularly interesting Galactic transient. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-ben-stappers-jodrell-bank-university-of-manchester/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2025/10/colloq_20251014.jpg
ORGANIZER;CN="Joshua Preston Pritchard":MAILTO:joshua.pritchard@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20251001T130000
DTEND;TZID=Australia/Sydney:20251001T140000
DTSTAMP:20260520T021545
CREATED:20251002T020957Z
LAST-MODIFIED:20251002T021018Z
UID:15805-1759323600-1759327200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Taïssa Danilovich (Monash University)
DESCRIPTION:The effect of evolved star binaries on circumstellar astrochemistry and dust formation\n\nAbstract: \n\nLow- and intermediate-mass stars disgorge their outer layers during the asymptotic giant branch (AGB) phase\, one of the last stages of their lives. Material containing newly-formed elements and a variety of dust and molecules streams out of them in what we call a stellar wind. Studies resolving the extended circumstellar environments of AGB stars have revealed spirals\, discs and bipolar outflows\, with the shaping of the gas attributed to interactions with a companion. However\, most of these companions are not directly observed\, because their light is so strongly attenuated by the dust created around the AGB star. Astrochemistry is the study of molecules\, dust and the chemical reactions that link them in astrophysical environments. I will discuss new methods that combine theoretical astrochemistry with observations to allow us to deduce the nature of the companion stars in binary systems with AGB stars. From this we can begin to understand how companion stars affect the length of the AGB phase. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-taissa-danilovich-monash-university/
LOCATION:CSIRO – Kensington\, Australian Resources Research Centre (ARRC)\, 26 Dick Perry Ave\, Kensington\, WA\, 6101\, Australia
CATEGORIES:Colloquia
ORGANIZER;CN="Li Wang":MAILTO:li.wang1@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20250926T130000
DTEND;TZID=Australia/Sydney:20250926T140000
DTSTAMP:20260520T021545
CREATED:20251002T020712Z
LAST-MODIFIED:20251002T021049Z
UID:15802-1758891600-1758895200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Ravi Subrahmanyan (CSIRO)
DESCRIPTION:Radio discovery of Cosmic Dawn\n\nAbstract \n\nAs First Light from the First Stars transforms the universe from Dark Ages into Cosmic Dawn\, the thermal history may be traced in redshifted 21-cm from neutral hydrogen in the gas.  Efforts to build radiometers  to detect this faint signal are yielding results of significance to the theory\, thus constraining the starlight of the earliest galaxies and their impact on the gas.  I will present the progression in astrophysical constraints that have resulted from radiometers deployed in remote sites in India – at the Timbaktu collective\, in the trans-Himalayan plateau and floated on remote lakes.   Progress in precision has led to building of a GINAN radiometer in CSIRO\, which has been trialed at the Inyarrimanha Ilgari Bundara\, the Murchison Radio-astronomy Observatory in remote radio-quiet Western Australia\, with an SKA-Low antenna element. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-ravi-subrahmanyan/
LOCATION:CSIRO – Kensington\, Australian Resources Research Centre (ARRC)\, 26 Dick Perry Ave\, Kensington\, WA\, 6101\, Australia
CATEGORIES:Colloquia
ORGANIZER;CN="Li Wang":MAILTO:li.wang1@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20250924T150000
DTEND;TZID=Australia/Sydney:20250924T160000
DTSTAMP:20260520T021545
CREATED:20250922T015318Z
LAST-MODIFIED:20250922T015633Z
UID:15716-1758726000-1758729600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Emma Carli (Swinburne University)
DESCRIPTION:Are neutron stars outside our galaxy any different?\n\nAbstract: \n\nThe TRAPUM  (TRAnsients and PUlsars with MeerKAT) collaboration has so far doubled the extragalactic radio pulsar population with a survey of nearby galaxies.The completed Small Magellanic Cloud (SMC) galaxy survey revealed a large proportion of neutron stars in this star-forming dwarf are young\, including new Pulsar Wind Nebulae systems\, as well as giant pulsar glitches and Vela-like behaviour. The prolific Large Magellanic Cloud survey is still under way.This prompted a new project to study the whole Neutron Star population of the SMC as a nearby template for the high-redshift\, low-metallicity\, star-forming dwarf galaxies that are producing hyperactive Fast Radio Bursts\, exotic supernovae\, gamma-ray bursts\, and large High-Mass X-ray Binary populations. I will present the implications of this project and our initial investigations. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-emma-carli-swinburne-university/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2025/09/colloq-24092025.png
ORGANIZER;CN="Joshua Preston Pritchard":MAILTO:joshua.pritchard@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20250922T150000
DTEND;TZID=Australia/Sydney:20250922T160000
DTSTAMP:20260520T021545
CREATED:20250922T015440Z
LAST-MODIFIED:20250922T015605Z
UID:15715-1758553200-1758556800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Aline Vidotto (Observatory of Leiden University\, Netherlands)
DESCRIPTION:Exo-space weather: The impact of stellar activity and outflows on exoplanets\n\nAbstract:  \n\nActivity of cool dwarf stars can reveal itself in the form of high-energy radiation (eg\, enhanced X-ray coronal emission\, flares) and particles (eg\, winds\, coronal mass ejections). Together\, these phenomena shape the space weather around (exo)planets. Because most of the known exoplanets have significantly closer orbital distances than solar system planets\, they are often embedded in much harsher particle and radiation environments\, leading to stronger interactions between the exoplanet and its surrounding environment.In this talk I will present some of our recent modelling efforts investigating how stellar activity and outflows can induce and shape atmospheric escape in exoplanets. I will also present the other side of the story: how (and when) exoplanets can affect the host star\, in particular\, focusing on radio emission that exoplanets can induce in the coronae of stars. Altogether\, these interactions can help us characterise the system\, putting physical constraints on planetary properties (such as their still elusive magnetic fields) as well as properties of the winds of planet hosting stars. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-aline-vidotto-observatory-of-leiden-university-netherlands/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2025/09/colloq-22092025.png
ORGANIZER;CN="Joshua Preston Pritchard":MAILTO:joshua.pritchard@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20250919T150000
DTEND;TZID=Australia/Sydney:20250919T160000
DTSTAMP:20260520T021545
CREATED:20250917T002650Z
LAST-MODIFIED:20250917T002651Z
UID:15693-1758294000-1758297600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Chenoa Tremblay (SETI / Breakthrough)
DESCRIPTION: Large-Scale Technosignatures Searches and the Stuff that Makes it Work\n\nAbstract: The search for technological life beyond Earth is a large-scale search for unidentified spectral-temporal signatures. So far\, most searches for these electromagnetic “technosignatures” have required dedicated time on telescopes or the use of archival data. A new digital back-end for the Karl G. Jansky Very Large Array (VLA) and the MeerKAT telescopes has been developed to continuously observe the sky during observations and process the data in real-time to detect these unique signals. The systems named COSMIC (the Commensal Open-source Multimode Interferometric Cluster) and BL USE employ Ethernet packet protocols\, real-time calibration strategies\, coherent and incoherent beamforming\, and open-source Doppler search algorithms to complete this goal at high-time and high-frequency resolutions. In collaboration with NRAO and the VLA sky-survey team\, we are recording during epoch 4 of the survey for one of the first all-sky searches for extraterrestrial signals\, with the sensitivity improvements allowed by such a powerful telescope. The purpose of this talk is to present the hardware and software structures of COSMIC and BL USE\, how they function\, and our first results. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-chenoa-tremblay-seti-breakthrough/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
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ORGANIZER;CN="Joshua Preston Pritchard":MAILTO:joshua.pritchard@csiro.au
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DTSTART;TZID=Australia/Sydney:20250917T150000
DTEND;TZID=Australia/Sydney:20250917T160000
DTSTAMP:20260520T021545
CREATED:20250917T002759Z
LAST-MODIFIED:20250917T002759Z
UID:15692-1758121200-1758124800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Iris de Ruiter (University of Sydney)
DESCRIPTION:The Variables and Slow Transients Extragalactic survey: exploring radio transients with ASKAP \n\nAbstract:  \n\nThe Variables and Slow Transients (VAST) survey on the Australian Square Kilometre Array Pathfinder (ASKAP) is transforming our view of the dynamic radio sky. For decades\, searches for radio transients typically yielded only a handful of detections. Today\, wide-field\, sensitive telescopes like ASKAP have transformed our view of the dynamic radio sky. With VAST\, we are monitoring millions of sources and building light curves on an unprecedented scale. \n\nIn this talk I will present an update on the extragalactic component of VAST. I will outline our observing strategy\, data processing and quality control\, and describe how we build and interpret light curves. Finally\, I will showcase results from the 100 most variable sources in our current sample—just the beginning of what this rich dataset can reveal. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-iris-de-ruiter-university-of-sydney/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2025/09/colloq-17092024.png
ORGANIZER;CN="Joshua Preston Pritchard":MAILTO:joshua.pritchard@csiro.au
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20250910T010000
DTEND;TZID=Australia/Sydney:20250910T020000
DTSTAMP:20260520T021545
CREATED:20250905T032256Z
LAST-MODIFIED:20250905T032330Z
UID:15351-1757466000-1757469600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Jane Kaczmarek (SKAO)
DESCRIPTION:SKA Science timeline \n\nAbstract \n\nAs the SKA timeline towards science progresses\, the SKAO aims to engage with the user community to define early access to the SKA telescopes through Science Verification planning. This talk will be a distillation of multiple presentations at the SKAO Science meeting in Görlitz earlier this year\, focusing on SKAO’s work in preparation for full science operations. Furthermore\, I will present SKA’s evolving science potential and highlight how community access to data and support services will scale at each key operational milestone. By linking scientific capabilities with operational planning the SKAO hopes to empower the global astronomy community with the tools to explore the full potential of SKA-era science \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-jane-kaczmarek-skao/
LOCATION:CSIRO – Kensington\, Australian Resources Research Centre (ARRC)\, 26 Dick Perry Ave\, Kensington\, WA\, 6101\, Australia
CATEGORIES:Colloquia
ORGANIZER;CN="Li Wang":MAILTO:li.wang1@csiro.au
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DTSTART;TZID=Australia/Sydney:20250827T150000
DTEND;TZID=Australia/Sydney:20250827T160000
DTSTAMP:20260520T021545
CREATED:20250814T001736Z
LAST-MODIFIED:20250814T001736Z
UID:14813-1756306800-1756310400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Arpan Pal (NCRA\, Pune)
DESCRIPTION:When Clusters Collide and Telescopes Misbehave: My Life as a Radio Astronomer\n\nAbstract:When galaxy clusters collide at thousands of kilometers per second\, they create cosmic particle accelerators spanning millions of light years\, driving shocks that accelerate particles and amplify magnetic fields to produce diffuse radio emissions revealing the invisible architecture of these extreme environments. I’ll present low-frequency polarization observations of merging galaxy clusters using the upgraded Giant Metrewave Radio Telescope (uGMRT)\, supported by X-ray and high-frequency radio data from VLA and MeerKAT.  \n\nSurprisingly\, we found that low-frequency polarization does not follow high-frequency predictions\, with depolarization inconsistent with single-component magnetic field models. We present the first linear polarization detection below 1 GHz requiring multicomponent magnetic field distribution\, challenging conventional shock compression models in radio relics. However\, reliable polarization extraction proved challenging due to mysterious time-variable instrumental effects initially appearing astrophysical. Extensive systematic investigation of the telescope’s signal chain – involving months of debugging\, testing individual components from feeds to correlators\, and eliminating potential sources one by one – eventually identified an unexpected instrumental culprit responsible for these anomalous signals.  \n\nThis detective work highlights how instrumental systematics can masquerade as cosmic phenomena and I will walk through this technical adventure. To handle the massive data volumes from modern radio surveys\, we developed “Charizard\,” a fast radio imaging pipeline using aggressive parallelization strategies that processes terabytes of interferometric data orders of magnitude faster than traditional approaches. This speed enables more iterative analysis\, better systematics characterization\, and the ability to tackle larger statistical samples of merger systems. \n\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-arpan-pal-ncra-pune/
LOCATION:NSW
CATEGORIES:Colloquia
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DTSTART;TZID=Australia/Sydney:20250826T150000
DTEND;TZID=Australia/Sydney:20250826T160000
DTSTAMP:20260520T021545
CREATED:20250814T001446Z
LAST-MODIFIED:20250817T230947Z
UID:14810-1756220400-1756224000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Rick Perley (NRAO)
DESCRIPTION:Precision Meter-wavelength Polarimetry with the Jansky Very Large Array\n\nAbstract:Accurate polarimetry at meter-wavelengths requires correction of the ionospheric Faraday rotation measure (IFRM) with an accuracy better than 0.15 rad/m2.  In this talk I will show the results of testing of both global and regional estimates of the IFRM generated from GNSS timing data.   These tests used extensive polarimetric observations by the VLA and MeerKAT of the Moon\, the only source of polarized emission with an a priori known electric vector position angle distribution. \n\nWe find that all global estimates made from maps of the vertical total electron content (VTEC) by various agencies overestimate the IFRM for VLA observations by 0.3 to 1.0 rad/m2\, while a regional model\, utilizing GNSS data from stations near the VLA is much better\, with errors of typically 0.15 rad/m2.  This is sufficiently accurate for VLA observations at 300 MHz\, but not for lower frequencies.   \n\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-rick-perley-nrao/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2025/08/Colloq-26082025.png
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20250820T150000
DTEND;TZID=Australia/Sydney:20250820T160000
DTSTAMP:20260520T021545
CREATED:20250817T231822Z
LAST-MODIFIED:20250817T231822Z
UID:14830-1755702000-1755705600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Rowina Nathan (Monash University)
DESCRIPTION:Understanding the gravitational wave background: pulsar timing arrays and skymapping\n\nAbstract:In June 2023\, members of the International Pulsar Timing Array (IPTA) released coordinated evidence for the gravitational wave background. In this seminar\, I will explain how pulsar timing arrays measure the gravitational wave background and discuss the latest results from various arrays.The MeerKAT radio telescope\, one of the most sensitive in the world\, has detected similar evidence after just 4.5 years of data collection through the MeerKAT Pulsar Timing Array. Thanks to its exceptional sensitivity and the new methods we have developed\, we have produced the most accurate maps of the gravitational-wave background to date. I will discuss our advances in skymapping methods and results. Mapping is crucial for understanding the origin of this background\, as an anisotropic background suggests supermassive black-hole binaries as the source. Notably\, we identify a hotspot in the 7 nHz map with a p-value of 0.015. \n\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-rowina-nathan-monash-university/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2025/08/me_gw_map-scaled.jpg
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