BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Australia Telescope National Facility - ECPv6.17.1//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Australia Telescope National Facility
X-ORIGINAL-URL:https://www.atnf.csiro.au
X-WR-CALDESC:Events for Australia Telescope National Facility
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Australia/Sydney
BEGIN:STANDARD
TZOFFSETFROM:+1100
TZOFFSETTO:+1000
TZNAME:AEST
DTSTART:20250405T160000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+1000
TZOFFSETTO:+1100
TZNAME:AEDT
DTSTART:20251004T160000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+1100
TZOFFSETTO:+1000
TZNAME:AEST
DTSTART:20260404T160000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+1000
TZOFFSETTO:+1100
TZNAME:AEDT
DTSTART:20261003T160000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+1100
TZOFFSETTO:+1000
TZNAME:AEST
DTSTART:20270403T160000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+1000
TZOFFSETTO:+1100
TZNAME:AEDT
DTSTART:20271002T160000
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VTIMEZONE
TZID:Australia/Perth
BEGIN:STANDARD
TZOFFSETFROM:+0800
TZOFFSETTO:+0800
TZNAME:AWST
DTSTART:20250101T000000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260128T150000
DTEND;TZID=Australia/Sydney:20260128T160000
DTSTAMP:20260122T040557Z
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:20260204T150000
DTEND;TZID=Australia/Sydney:20260204T160000
DTSTAMP:20260129T232024Z
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:20260225T120000
DTEND;TZID=Australia/Sydney:20260225T130000
DTSTAMP:20260224T065328Z
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:20260312T120000
DTEND;TZID=Australia/Sydney:20260312T130000
DTSTAMP:20260306T042802Z
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:20260325T120000
DTEND;TZID=Australia/Sydney:20260325T130000
DTSTAMP:20260319T102254Z
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:20260326T120000
DTEND;TZID=Australia/Sydney:20260326T130000
DTSTAMP:20260325T234550Z
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:20260331T150000
DTEND;TZID=Australia/Sydney:20260331T160000
DTSTAMP:20260325T234343Z
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/Perth:20260401T120000
DTEND;TZID=Australia/Perth:20260401T130000
DTSTAMP:20260401T043523Z
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:20260408T150000
DTEND;TZID=Australia/Sydney:20260408T160000
DTSTAMP:20260330T023210Z
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:20260506T120000
DTEND;TZID=Australia/Perth:20260506T130000
DTSTAMP:20260430T030300Z
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:20260513T150000
DTEND;TZID=Australia/Sydney:20260513T160000
DTSTAMP:20260507T002040Z
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/Sydney:20260520T150000
DTEND;TZID=Australia/Sydney:20260520T160000
DTSTAMP:20260507T234255Z
CREATED:20260507T234254Z
LAST-MODIFIED:20260507T234255Z
UID:18832-1779289200-1779292800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Xiaohui Sun (Yunnan University)
DESCRIPTION:Study of Galactic multi-scale magnetic field with radio polarization observation\n\nAbstract: \n\nRadio polarization observation provides an important way to study Galactic magnetic field from small to large scales. All-sky polarization surveys with broad frequency coverage are well suited for the study. In this talk\, I present recent studies on supernova remnants and pulsar wind nebulae from ASKAP and ATCA observations. I will then present the results from the STAPS survey conducted with Murriyang and ongoing FAST observations. To the low frequency end\, the polarization images from MWA reveal large-scale structures likely originated from local interstellar medium. I will conclude the talk with a perspective with future SKA. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-xiaohui-sun-yunnan-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/2026/05/pi_mwa_gal_zea_2.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Perth:20260527T130000
DTEND;TZID=Australia/Perth:20260527T140000
DTSTAMP:20260527T021904Z
CREATED:20260526T075305Z
LAST-MODIFIED:20260527T021904Z
UID:19039-1779886800-1779890400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Lindsey Oberhelman (ANU)
DESCRIPTION:The turbulent magnetic Milky Way\, deriving a turbulent field scale height from POSSUM data\n\nAbstract: \n\nUsing broadband polarimetric observations from the ASKAP POSSUM survey\, I investigate the turbulent magnetised interstellar medium of the Milky Way through Faraday complexity in more than 37\,000 polarised extragalactic radio sources. By applying QU-fitting to the Stokes Q and U spectra\, I measure Faraday broadening\, which traces fluctuations in the line-of-sight magnetic field and thermal electron density. I examine the Galactic latitude dependence of turbulence and interpret the results using the exponential disk model. The results also suggest a possible north–south asymmetry in the turbulent foreground\, potentially linked to Galactic structure\, spiral arms\, warp\, or the Magellanic system. I discuss the role of turbulence correlation length assumptions\, comparisons with pulsar scintillation and RM structure-function studies\, and ongoing work using RM structure functions to constrain the physical scales of turbulence probed by POSSUM.  \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-lindsey-oberhelman-anu/
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/2026/05/Colloq-27052026.png
ORGANIZER;CN="Gemma Anderson":MAILTO:gemma.anderson@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Perth:20260609T130000
DTEND;TZID=Australia/Perth:20260609T140000
DTSTAMP:20260609T035554Z
CREATED:20260609T035553Z
LAST-MODIFIED:20260609T035554Z
UID:19154-1781010000-1781013600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Dr Jack Radcliffe (University of Manchester)
DESCRIPTION:Very Long Baseline Interferometry for science and society \n\nAbstract: \n\nVery Long Baseline Interferometry (VLBI) combines signals from telescopes separated by continental distances to achieve the highest angular resolution in astronomy\, enabling direct imaging of phenomena ranging from Active Galactic Nuclei\, including the first images of a black hole shadow\, to star-forming regions and pulsars. Reaching this resolution requires aligning signals to nanosecond precision across baselines of thousands of kilometres. This same precision makes VLBI an indispensable tool in geodesy\, the study of Earth’s dynamic shape\, size\, and gravitational field\, underpinning applications from climate monitoring and natural disaster response to precision agriculture and navigation\, with an estimated economic contribution of ~1.34 trillion USD by 2030. \n\nIn this talk\, I highlight two areas in which I have been involved. First\, I discuss advances in wide-field VLBI surveys. Traditionally\, observations have targeted a single source per pointing\, with large surveys requiring years to accumulate meaningful samples. Computational improvements now enable imaging of multiple sources within a single field and access to lower frequencies through the International LOFAR Telescope. I present scientific and technical results from these surveys\, and describe new commensal survey programmes\, including one on the ATNF Long Baseline Array\, that will increase the number of sources studied at high resolution by two orders of magnitude. \n\nSecond\, I discuss VLBI’s broader societal impact. The Development in Africa with Radio Astronomy (DARA) programme has trained over 400 students across the African continent in radio astronomy over the past decade. Building on this foundation\, the GGOS-Africa project aims to develop geodetic infrastructure\, governance\, and human capacity across Africa. I present initial results from this project and outline the path forward. \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-dr-jack-radcliffe-university-of-manchester/
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/2026/06/APAD_pic_radcliffe.png
ORGANIZER;CN="Gemma Anderson":MAILTO:gemma.anderson@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260609T140000
DTEND;TZID=Australia/Sydney:20260609T150000
DTSTAMP:20260604T023944Z
CREATED:20260604T023943Z
LAST-MODIFIED:20260604T023944Z
UID:19140-1781013600-1781017200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Paola Di Ninni (INAF)
DESCRIPTION:The Italian National Institute for Astrophysics (INAF): Radio astronomy projects and my dedicated research activity\n\nAbstract: \n\nI will talk about the Italian National Institute for Astrophysics (INAF)\, a public research institute consisting of more than 1\,400 people organized into 16 institutes spread from the North to the South of Italy. After an introduction to the diverse activities at INAF within the fields of technology\, astronomy\, and astrophysics\, I will focus on the field of radio astronomyby giving an overview of the Italian infrastructure: three radio telescopes located in Sardinia\, Sicily\, and Emilia-Romagna\, and INAF’s contribution to international projects such as SKA and ALMA. I will conclude by talking about my research experience at INAF\, where I dedicate my time to technologies for radio astronomy—an exciting field that bridges cutting-edge engineering with our deepest questions about the universe. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-paola-di-ninni-inaf/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Perth:20260611T100000
DTEND;TZID=Australia/Perth:20260611T110000
DTSTAMP:20260527T022622Z
CREATED:20260527T022430Z
LAST-MODIFIED:20260527T022622Z
UID:19057-1781172000-1781175600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Dr Konstantinos Kolokythas (Rhodes University and SARAO)
DESCRIPTION:From Group Dynamics to Cluster Halos: A Multi-Band View of Galaxy Evolution in Groups and the Diffuse Skies in Clusters \n\nAbstract: \n\nMuch of the evolution of galaxies before they are assimilated into clusters occurs in groups where AGN feedback has the greatest impact on galaxy formation and evolution. Conversely\, clusters are the largest gravitationally bound structures in the Universe\, with radio observations being powerful tools for detecting diffuse cluster-scale synchrotron emission\, which conveys information about the cluster formation history. In the first part of this talk\, I will summarize results from studies of the central brightest group early-type galaxies (BGEs) of an optically selected\, statistically complete sample of 53 nearby groups (<80 Mpc; CLoGS sample)\, observed in radio 235/610 MHz (GMRT)\, CO (IRAM/APEX) and X-ray (Chandra and XMM-Newton) frequencies examining the balance between hot and cold gas (AGN feedback) and the AGN activity and star formation in groups\, presenting also updated results from MeerKAT L-Band observations.  In the second part\, I will summarise results from the recently published MeerKAT’s Galaxy Cluster Legacy Survey (MGCLS) diffuse radio emission catalogue work (Kolokythas et al. 2025)\, a project which originally comprised the first MeerKAT L-Band long-track observations of 115 galaxy clusters at 1.28 GHz across the Southern sky. I will focus on the discoveries and properties of the various diffuse radio emission structures detected in MGCLS galaxy clusters\, which reveal new areas of investigation in cluster formation and evolution that pave the way for the SKA era.  \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-dr-konstantinos-kolokythas-rhodes-university-and-sarao/
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/2026/05/MGCLSII_DEcatalogue_Mosaic_Konstantinos.png
ORGANIZER;CN="Gemma Anderson":MAILTO:gemma.anderson@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260617T150000
DTEND;TZID=Australia/Sydney:20260617T160000
DTSTAMP:20260610T233644Z
CREATED:20260610T233644Z
LAST-MODIFIED:20260610T233644Z
UID:19160-1781708400-1781712000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Simon Ho (ANU)
DESCRIPTION:Fast Radio Transients in the nearby Universe\n\nAbstract: \n\nMotivated by the discovery of a repeating FRB associated with a globular cluster in the nearby galaxy M81\, this talk explores the origins of fast radio transients in old stellar environments and examines the relationship between FRBs and giant radio pulses (GPs) from neutron stars. Using MeerKAT ultra-high frequency (UHF) baseband observations of the millisecond pulsar PSR J1823-3021A in the globular cluster NGC 6624\, we detect more than 3.7×10^4 GPs per hour\, establishing it as one of the most prolific GP emitters known. Although the pulses exhibit complex temporal and spectral structures\, their energetics\, periodicity\, and statistical properties distinguish them from FRBs\, suggesting that GPs are unlikely to be direct low-energy analogues of the FRB population. We also investigate scintillation and coherent descattering\, demonstrating the feasibility of recovering intrinsic pulse structures from giant pulses in J1823-3021A. Extending this work to extragalactic systems\, we conduct a deep FAST search for FRBs from globular clusters in the nearby elliptical galaxy M49 (NGC 4472)\, covering ~4000 globular clusters. No FRBs are conclusively detected\, yielding stringent upper limits on FRB activity in globular clusters. Lastly\, in this talk\, I will briefly present the current status of the Bustling Universe Radio Survey Telescope in Taiwan (BURSTT)\, which is a dedicated survey aiming to search for FRBs in the nearby universe with its extremely wide field of view (~10\,000 square degrees). \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-simon-ho-anu/
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/2026/06/telescopes.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260624T150000
DTEND;TZID=Australia/Sydney:20260624T160000
DTSTAMP:20260619T070136Z
CREATED:20260619T070135Z
LAST-MODIFIED:20260619T070136Z
UID:19214-1782313200-1782316800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Hariharan Krishnan (SKAO)
DESCRIPTION:Enabling Next-Generation Solar and Heliospheric Science with SKA-Low Signal Processing\n\nAbstract: \n\nThe Square Kilometre Array-Low (SKA-Low) telescope represents a transformative leap forward for low-frequency radio astronomy. Operating across the 50–350 MHz band with 131\,072 dual-polarization log-periodic dipole antennas grouped into 512 Low-Frequency Aperture Array (LFAA) stations\, the array presents unprecedented digital signal processing challenges. At the heart of this system lies a tightly integrated digital signal chain. Within the Signal Processing Subsystem (SPS)\, broadband analog RF signals from the antenna are digitized at high dynamic range and channelized through a polyphase filterbank producing coarse frequency channels that optimise data transport efficiency for the station beamformer module. The ensemble of station beams are then processed by the Central Signal Processor (CSP) Correlator and Beamformer (CBF) to generate full-polarization visibilities for high-fidelity imaging and narrow\, high-time-resolution tied-array beams. \n\nThis talk provides an overview of how this signal chain architecture interfaces with frontier solar and heliospheric observations. SKA-Low’s dense short-baseline configuration and broad instantaneous bandwidth offer the raw capability for sub-second imaging spectroscopy of impulsive solar radio emission and Coronal Mass Ejections (CMEs)\, alongside high-cadence observations of interplanetary scintillation (IPS) to probe the dynamic solar wind. However\, physical interpretation in this low-frequency regime is intrinsically shaped by propagation effects\, including scattering\, refraction\, and magneto-ionic mode coupling within the coronal plasma. I will outline the direct mapping between the Low telescope digital signal processing capabilities and the science enabled in the solar and heliospheric context\, while highlighting the resulting limits on physical inference. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-hariharan-krishnan-skao/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260701T150000
DTEND;TZID=Australia/Sydney:20260701T160000
DTSTAMP:20260629T012710Z
CREATED:20260624T021222Z
LAST-MODIFIED:20260629T012710Z
UID:19250-1782918000-1782921600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Macon Magno (Texas A&M University)
DESCRIPTION:A Complete Census of the Properties of Radio-Quiet AGN in the Local Universe: Implications for Black Holes and AGN Feedback\n\nAbstract: \n\nActive Galactic Nuclei (AGN) are among the most energetic objects in the Universe\, powered by accretion onto supermassive black holes. Despite decades of study\, many questions remain about how AGN generate radio emission and interact with their host galaxies. In this talk\, I will present results from three radio studies of nearby AGN. First\, I will discuss the final phase of the largest 22 GHz\, 1” resolution imaging survey of 231 nearby Swift-BAT selected AGN. We find a wide range of radio morphologies and show that the compact radio cores are consistent with coronal emission\, while the extended emission is largely associated with star formation. Next\, I will present radio spectral energy distributions for 100 AGN spanning frequencies from tens of MHz to hundreds of GHz. Using a Bayesian modeling framework\, we find that fewer than half of the sources are well described by a simple power law\, highlighting the complexity of AGN radio emission and the need for broad frequency coverage to uncover the physical processes shaping AGN spectra. Finally\, I will present high-resolution VLA observations of a water maser in the Seyfert 2 galaxy NGC 1106. Rather than originating in the accretion disk\, we localize the maser approximately one kpc from the nucleus\, where it is likely produced by an interaction between an AGN-driven outflow and the surrounding interstellar medium. Together\, these results provide new insights into the origin of radio emission in AGN and the ways in which AGN interact with their host galaxies. \n\nPlease note that this colloquium will be held in the Marsfield 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-macon-magno-texas-am-university/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260715T150000
DTEND;TZID=Australia/Sydney:20260715T160000
DTSTAMP:20260713T000627Z
CREATED:20260713T000626Z
LAST-MODIFIED:20260713T000627Z
UID:19453-1784127600-1784131200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Emily Kerrison (University of Sydney & ATNF)
DESCRIPTION:Understanding young active galaxies across the radio spectrum\n\nAbstract: \n\nThe lifecycle of active galaxies is an open question in modern astronomy. In particular\, not all active galaxies are active radio galaxies\, and it is not obvious why. In this talk I’ll discuss my thesis work on these active radio galaxies\, completed as part of the First Large Absorption Survey in HI\, and conducted with the Australian SKA Pathfinder (ASKAP-FLASH). Early on\, we realised many HI detections in ASKAP-FLASH were made towards so-called ‘Peaked Spectrum’ sources\, active galaxies in which the synchrotron jets are still embedded in the dense\, nuclear gas of their host galaxy. I’ll discuss how we identify these objects from pre-existing survey data using a Bayesian framework\, RadioSED\, and how a multiwavelength analysis of the resulting samples shows many are distant\, capable of probing galaxy-scale interactions at cosmic noon and beyond. Moving from observations to simulations\, I’ll show how we can test the impact of system geometry and morphology on FLASH detection rates using cosmological simulations as a sandbox. Ultimately\, I wish to highlight the role of peaked spectrum sources in studies of active galaxy evolution\, jet-gas interactions\, and the changing distribution of gas across the different ages of our Universe. \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-emily-kerrison-university-of-sydney-atnf/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260728T150000
DTEND;TZID=Australia/Sydney:20260728T160000
DTSTAMP:20260723T001941Z
CREATED:20260722T020906Z
LAST-MODIFIED:20260723T001941Z
UID:19542-1785250800-1785254400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Anna Ho (Cornell University)
DESCRIPTION:Relativistic Stellar Explosions: The Landscape Revealed by Wide-field\, High-cadence Optical Surveys\n\nAbstract: \n\n For the last half-century\, relativistic outflows accompanying the final collapse of massive stars have predominantly been detected via high-energy emission\, as long-duration gamma-ray bursts (GRBs). However\, it has long been hypothesized that GRBs are the extreme of a continuum of phenomena\, including dirty fireballs and off-axis jets. I will show that the large grasp of optical surveys has recently made it possible to test this hypothesis by probing the phase space of fast and rare transients\, with targeted radio observations playing a crucial role in confirming the presence of relativistic ejecta. I will review the emerging zoo\, which includes orphan afterglows at cosmological distances\, radio-bright supernovae in the local universe\, and unexpected new classes of transients that are prime targets for millimeter-band observations. An understanding of the origin of these events and their relation to GRBs will be enabled by upcoming time-domain surveys in other bands\, such as X-ray and UV. \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-anna-ho-cornell/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260729T150000
DTEND;TZID=Australia/Sydney:20260729T160000
DTSTAMP:20260722T020850Z
CREATED:20260722T020849Z
LAST-MODIFIED:20260722T020850Z
UID:19541-1785337200-1785340800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Harshda Saxena (Caltech)
DESCRIPTION:A Multi-Wavelength Study of Cluster Cosmology and Astrophysics\n\nAbstract: \n\nGalaxy clusters are powerful probes of both cosmology and astrophysics\, tracing the growth of large-scale structure while providing a laboratory for studying the physics of the intracluster medium (ICM) and Active Galactic Nuclei (AGN). In this talk\, I will present my thesis work which uses multi-wavelength observations and simulations to characterize key astrophysics that affect cluster-based cosmological measurements. I will discuss how millimeter emission from cluster-member AGNs contaminates Sunyaev-Zel’dovich (SZ) cluster surveys\, including our recovery of two clusters in ACT maps using CARMA data. Building on this work\, I will present our plans for ongoing ATCA observations of millimeter-bright AGNs in the SPT-Deep field\, which will provide the first constraints on AGN-induced biases in a complete SZ-selected cluster sample. I will also discuss our previous work to quantify the impact of another astrophysical systematic\, cluster triaxiality\, on SZ selection\, which further leads to biases in weak-lensing mass estimates. To quantify the effect of this triaxiality\, our collaboration is developing a multi-probe framework that combines X-ray\, SZ\, and weak-lensing observations of clusters to constrain cluster geometry\, improve mass measurements\, and probe dark matter physics and mass accretion histories. In addition\, I will discuss ongoing work on cluster scaling relations using both observations and simulations\, with the goals of identifying low-scatter mass proxies and quantifying correlations between cluster observables. Finally\, I will present our work characterizing non-thermal pressure support in the ICM of clusters through combined SZ and X-ray fluctuation measurements\, representing the first such analysis using eROSITA and SZ data. \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-harshda-saxena-caltech/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260812T150000
DTEND;TZID=Australia/Sydney:20260812T160000
DTSTAMP:20260722T021023Z
CREATED:20260722T021022Z
LAST-MODIFIED:20260722T021023Z
UID:19545-1786546800-1786550400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Daniel Reardon (Swinburne University)
DESCRIPTION:TBD\n\nAbstract: \n\nTBD \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-daniel-reardon-swinburne-university/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
END:VCALENDAR