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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220316T150000
DTEND;TZID=Australia/Sydney:20220316T160000
DTSTAMP:20260522T223402
CREATED:20250819T080622Z
LAST-MODIFIED:20250820T025109Z
UID:14981-1647442800-1647446400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Charlotte Ward (University of Maryland)
DESCRIPTION:Tracing the first massive black hole seeds and their merger-driven growth with the Zwicky Transient Facility.\n\nAbstract\n\nOver the last 3 years\, the Zwicky Transient Facility (ZTF) has demonstrated the capability of wide-field time-domain surveys to discover the important black hole populations which trace the formation of the first massive black hole seeds and their merger-driven growth. For instance\, our search for off-nuclear active galactic nuclei (AGN) in ZTF revealed 9 supermassive black holes (SMBHs) which may have been ejected from their host galaxy by gravitational wave recoil from SMBH mergers with misaligned spins. Likewise\, our search for variable intermediate mass black holes (IMBHs) in dwarf galaxies found 200 new IMBH candidates\, most of which could not have been found via their spectroscopic signatures alone. Finally\, our study of periodically variable AGN with double-peaked broad emission lines revealed how single AGN can mimic SMBH binaries and mergers. We found these rare black holes amongst large populations of AGN in part by using innovative forward modelling techniques to improve photometric sensitivity and measure the separations between variable objects and their host galaxies. Our work is an exciting precursor to the Legacy Survey of Space and Time which we expect to detect substantially larger populations of recoiling SMBH and IMBH candidates. \nWatch recording\nSlides\n\ncharlotte_ward_colloquiumDownload\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-charlotte-ward-university-of-maryland/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-16032022.jpg
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220309T150000
DTEND;TZID=Australia/Sydney:20220309T160000
DTSTAMP:20260522T223402
CREATED:20250819T081913Z
LAST-MODIFIED:20250820T025013Z
UID:14982-1646838000-1646841600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Marcus Lower (CSIRO)
DESCRIPTION:A radio-loud magnetar with an identity crisis\n\nAbstract\n\nMagnetars are a rare class of highly magnetised neutron star. They are the primary source of local gamma-ray bursts and are speculated to produce a significant fraction of extragalactic fast radio bursts. Studying the local population of magnetars within the Milky Way is therefore key to understanding these highly energetic objects and the role they play in the transient sky. In this talk\, I will present the initial results of on-going project to monitor a peculiar radio-loud magnetar\, Swift J1818.0-1607\, with Murriyang\, the Parkes 64-m radio telescope. This includes the unusually pulsar-like properties of this object seen in early observations\, and a brief identity crisis in which the neutron star displayed a host of unique behaviour never before seen any other radio pulsar. \nWatch recording\nSlides\n\nMarcus_Lower_colloquiumDownload\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-marcus-lower-csiro/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-09032022-scaled.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220216T150000
DTEND;TZID=Australia/Sydney:20220216T160000
DTSTAMP:20260522T223402
CREATED:20250819T082323Z
LAST-MODIFIED:20250819T082323Z
UID:14983-1645023600-1645027200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Joe Callingham (ASTRON/Leiden University)
DESCRIPTION:Radio Stars and exoplanets\n\nAbstract\n\nOne key question that astronomy is attempting to answer is whether there are habitable planets around stars other than our Sun. While we have entered an era where identifying nearby exoplanets has become standard\, discerning whether the environmental conditions dictated by the host stars are suitable for life has proved far more elusive. The detection of low-frequency radio emission from an M dwarf or an exoplanet provides a direct probe of extrasolar space weather and the planet’s magnetic field – information crucial for assessing the potential habitability of the planet. In this talk\, I will outline our LOFAR survey of stellar systems\, with a focus on our recent detection of strong\, highly circularly polarised low-frequency radio emission associated with nearby stars – the expected signpost of star-exoplanet interactions. I will discuss how our survey represents the most comprehensive observations of stellar systems at low frequencies\, and the implications of this new population in understanding the magnetosphere of M dwarfs and exoplanetary magnetic fields. I will conclude with our progress in determining the expected periodicity of the radio emission from star-planet interactions. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-joe-callingham-astron-leiden-university-2/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-16022022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20211215T150000
DTEND;TZID=Australia/Sydney:20211215T160000
DTSTAMP:20260522T223402
CREATED:20250819T082349Z
LAST-MODIFIED:20250820T032713Z
UID:14984-1639580400-1639584000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Ravi Subrahmanyan (CSIRO)
DESCRIPTION:Towards radio discovery of cosmic dawn\n\nAbstract\n\nAs First Light from the first stars transforms the universe from the dark ages into cosmic dawn\, the history may be traced in redshifted 21-cm from neutral hydrogen in the gas. Efforts to build precision radiometers over the 40-200 MHz band to detect this faint signal are beginning to yield results of significance to the theory\, thus constraining the starlight of the earliest galaxies. I will present the progression in SARAS radiometers that have been deployed in remote sites in India – at the Timbaktu collective\, in the trans-Himalayan plateau and\, most recently\, floated on a remote lake. I will then discuss the impact of the data on the astrophysics of the Epoch of Reionisation and Cosmic Dawn\, our attempt to confirm the EDGES detection\, and the road ahead. \n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-ravi-subrahmanyan-csiro/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-15122021-scaled.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20211124T150000
DTEND;TZID=Australia/Sydney:20211124T160000
DTSTAMP:20260522T223402
CREATED:20250819T082748Z
LAST-MODIFIED:20250820T032735Z
UID:14985-1637766000-1637769600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Jacinta Delhaize (University of Cape Town / SARAO)
DESCRIPTION:Galaxy evolution surveys with MeerKAT: Selected updates from LADUMA and MIGHTEE\n\nAbstract\n\nLADUMA and MIGHTEE are two galaxy evolution surveys well underway with the SKA precursor telescope MeerKAT. LADUMA (HI only) and MIGHTEE (HI and continuum) are both starting to produce exciting new papers\, thanks to MeerKAT’s excellent sensitivity. I will give a brief overview of these surveys and present selected updates. In particular\, I will discuss source finding attempts using SoFiA on early LADUMA data. \n\n I will also summarise the results of our recent paper (Delhaize et al.\, 2021) on the discovery of two giant radio galaxies (GRGs) in MIGHTEE. GRGs are the largest single objects in the Universe and are relatively rare\, with fewer than 850 currently known. Only around 7% of these have sizes greater than 2Mpc\, yet we have detected two such objects within a 1 square degree field in MIGHTEE-COSMOS Early Science observations. These may be the first of a new population to be revealed through surveys like MIGHTEE\, which provide exquisite sensitivity to diffuse\, extended emission. \n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-jacinta-delhaize-university-of-cape-town-sarao/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-24112021.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20211110T150000
DTEND;TZID=Australia/Sydney:20211110T160000
DTSTAMP:20260522T223402
CREATED:20250819T101750Z
LAST-MODIFIED:20250819T101751Z
UID:14986-1636556400-1636560000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Isobel Romero-Shaw (Monash)
DESCRIPTION:An Interview with an Intermediate-Mass Black Hole: Gravitational-Wave Signal GW190521\n\nAbstract\n\nOn the 21st of May\, 2019\, gravitational-wave observatories LIGO and Virgo detected something we had never seen before. The short signal they captured — more of a low-pitched ‘blip’ than a ‘chirp’ — emanated from the creation of an intermediate-mass black hole\, making GW190521 the first direct evidence of the existence of such objects. This intermediate-mass black hole was formed from the merger of two smaller black holes\, at least one of which had a mass that is troublesome to explain through stellar evolution. Pair-instability supernovae are thought to cause a “gap” in the mass distribution of black holes\, such that black holes with masses between 60 and 130 times the mass of the Sun should not exist. The components of GW190521 had masses of about 85 and 65 solar masses — so how did these “forbidden” black holes come into existence? In this talk\, I will present the results of the LIGO—Virgo Collaboration’s analysis of GW190521. I will explain how we can learn a lot about the source from such a short signal\, and discuss potential formation mechanisms for this mysteriously massive binary. Finally\, I will discuss the implications for the population of compact binaries if any of these formation mechanisms are confirmed. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-isobel-romero-shaw-monash/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-10112021.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20211103T150000
DTEND;TZID=Australia/Sydney:20211103T160000
DTSTAMP:20260522T223402
CREATED:20250819T101813Z
LAST-MODIFIED:20250819T101813Z
UID:14987-1635951600-1635955200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Laura Driessen (CSIRO)
DESCRIPTION:Commensal searches for variable radio sources with MeerKAT\n\nAbstract\n\nNew wide-field\, sensitive radio instruments are enabling us to search and investigate the dynamic radio sky like never before. Previous untargeted radio searches in the image plane have been limited by small fields of view\, combining observations from mismatched surveys and instruments\, and large gaps between epochs. Now instruments such the MeerKAT\, ASKAP\, the Karl G. Janksy VLA\, LOFAR\, and the MWA are uncovering large samples of dynamic radio sources without performing targeted searches. ThunderKAT is the MeerKAT large science project for searching for and investigating variable and transient radio sources in the image plane\, and has already revealed exciting results on relativistic binaries\, cataclysmic variables and more. A key part of ThunderKAT’s goals is to perform untargeted\, image-plane searches for variable and transient sources. I will present MKT J170456.2-482100\, the first transient discovered with MeerKAT\, and 25 new variable radio sources discovered with MeerKAT in the image-plane. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-laura-driessen-csiro/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-03112021.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20211027T150000
DTEND;TZID=Australia/Sydney:20211027T160000
DTSTAMP:20260522T223402
CREATED:20250819T101910Z
LAST-MODIFIED:20250819T101911Z
UID:14988-1635346800-1635350400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Michael Janssen (MPIfR / Radboud University)
DESCRIPTION:The latest results from the Event Horizon Telescope: Zooming into the heart of Centaurus A\n\nAbstract\n\nCentaurus A is the closest radio galaxy to Earth and has been studied extensively as a laboratory for AGN feedback and potential UHECR source after its discovery as one of the first extragalactic radio sources in 1949. I will present the results from our EHT observations of this southern source. Compared to previous VLBI studies\, we have imaged the AGN jet of Cen A at a 16x sharper resolution and 10x higher observing frequency. This allows us to probe the launching region of an extragalactic radio jet on sub-lightday scales. We can directly compare our image to VLBI observations of M87 at a lower frequency\, as both probe the same size scales in terms of gravitational radii. Based on the similarity of these jets\, we show that our observations provide further support for the fundamental plane of black hole activity in an intermediate mass regime. From the location of the resolved radio core in Cen A\, we predict the source’s black hole shadow to be visible at THz frequencies\, which marks Cen A for future high-frequency space VLBI missions. I will conclude with an outlook of our next observational and modeling steps. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-michael-janssen-mpifr-radboud-university/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/EHT-20072021-1.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20211020T150000
DTEND;TZID=Australia/Sydney:20211020T160000
DTSTAMP:20260522T223402
CREATED:20250819T101933Z
LAST-MODIFIED:20250820T023820Z
UID:14989-1634742000-1634745600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Nithyanandan Thyagarajan (CSIRO)
DESCRIPTION:Towards a General Theory of Closure Invariants in Radio Interferometry\n\nAbstract\n\nRecent “planet-scale” very long baseline interferometry (VLBI) efforts at millimetre wavelengths have resulted in the first detailed images near the event horizon of the supermassive black hole (SMBH) at the centre of M87 by the Event Horizon Telescope (EHT) collaboration. Calibration of the radio signals received by such widely separated VLBI stations is one of the key challenges in the accurate reconstruction of images. Closure phases and amplitudes in co-polar interferometry\, have long provided calibration-independent observables immune to multiplicative\, station-dependent corruptions. Very recently\, “closure traces” for full polarimetric interferometry have been introduced and used in the recent study of the magnetic field structures around the M87 central black hole. So far\, a systematic method for explicitly exhibiting a full set of invariants has still remained unclear. Using the mathematical framework of the gauge theories of particle physics and Lorentz transformations\, I will describe a general formalism\, applicable to interferometer arrays of arbitrary size\, that uses only triangular combinations of correlations as basic building blocks to precisely isolate a complete and independent set of invariants\, and unifies the treatment for all closure invariants\, from which the closure phases and closure amplitudes familiar in co-polar interferometry naturally emerge. These results can find significant applications in ongoing and future (including space-based) observations of SMBHs using the current and the next-generation EHT (ngEHT)\, and more generally\, polarimetric radio interferometry. \nWatch recording\nSlides\n\nNT_ClosureInvariants_CSIRO_SandA_colloquium_20-Oct-2021Download\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-nithyanandan-thyagarajan-csiro/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-20102021.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210929T150000
DTEND;TZID=Australia/Sydney:20210929T160000
DTSTAMP:20260522T223402
CREATED:20250819T102008Z
LAST-MODIFIED:20250820T032752Z
UID:14990-1632927600-1632931200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Sofia Sheikh (Penn. State)
DESCRIPTION:The Breakthrough Listen Signal-of-Interest ‘blc1’: Analysis\, Origin\, and Lessons Learned\n\nAbstract\n\nThe aim of the search for extraterrestrial intelligence (SETI) is to find technologically-capable life beyond Earth through their technosignatures. On 2019-April-29\, the Breakthrough Listen SETI project observed Proxima Centauri with the Parkes “Murriyang” radio telescope. These data contained a narrowband signal with characteristics broadly consistent with a technosignature near 982 MHz (colloquially named ‘blc1’). In this talk\, I will present the discovery and characterization of blc1 in the context of the ubiquity of human-generated radio interference. Briefly: we find that blc1 is not an extraterrestrial technosignature\, but rather an electronically-drifting intermodulation product of local\, time-varying interferers aligned with the observing cadence. We find dozens of instances of radio interference with similar morphologies to blc1 at harmonically-related frequencies to common clock oscillators. These complex intermodulation products highlight the necessity for detailed follow-up of any signal-of-interest. I will end the talk with a discussion of the necessity of signal verification procedures\, and lessons learned from this intriguing case study. \n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-sofia-sheikh-penn-state/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-29092021.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210915T150000
DTEND;TZID=Australia/Sydney:20210915T160000
DTSTAMP:20260522T223402
CREATED:20250819T102033Z
LAST-MODIFIED:20250819T102034Z
UID:14991-1631718000-1631721600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Barnali Das (NCRA-TIFR)
DESCRIPTION:What makes a living\, lazy and luminous pulsar\, a.k.a. ‘Main-sequence Radio Pulse emitter’?\n\nAbstract\n\nLiving\, lazy and luminous pulsars are magnetic early-type stars that emit periodic radio pulses\, just like a ‘normal’ pulsar; but rotating with a considerably less angular speed than that for neutron stars. We call such objects as ‘Main-sequence Radio Pulse emitters’ (MRPs). The emission mechanism behind\, the electron cyclotron maser emission (ECME)\, is the same one that also drives coherent radio emission in planets and dwarf stars. The MRPs have been assumed to be exotic objects due to their rarity for a long time (only one such object was discovered between 2000-2015)\, and why this is the case has been a mystery. In my talk\, I will describe an ongoing survey conducted with the updated Giant Metrewave Radio Telescope (uGMRT) in an effort to resolve this issue. I will present the discoveries made so far\, and an unexpected possibility that has emerged from them. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-barnali-das-ncra-tifr/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-15092021.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210901T150000
DTEND;TZID=Australia/Sydney:20210901T160000
DTSTAMP:20260522T223402
CREATED:20250819T102054Z
LAST-MODIFIED:20250819T102055Z
UID:14992-1630508400-1630512000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Christene Lynch (ICRAR/Curtin)
DESCRIPTION:The Long-Baseline Epoch of Reionisation Survey\n\nAbstract\n\nOne of the principal systematic constraints on the Epoch of Reionisation (EoR) experiment is the accuracy of the foreground calibration model. Recent results have shown that highly accurate models of extended foreground sources\, and including models for sources in both the primary beam and its sidelobes\, are necessary for reducing foreground power. To improve the source models in the EoR fields observed by the Murchison Widefield Array (MWA)\, we conducted the Long Baseline Epoch of Reionisation Survey. This survey consists of multi-frequency observations\, spanning 104 – 230 MHz\, of the MWA EoR fields and their eight neighbouring fields using the MWA Phase II extended array. These observations provide high-resolution\, (u\,v)-components to compliment the existing (u\,v)-plane sampling of these fields. Additionally\, due to the better imaging capabilities of the MWA Phase II extended array\, this survey improves upon the sensitivity of the GLEAM survey by roughly a factor of 5 in the EoR fields. This talk will present results from the first half of the LoBE survey and discuss the next steps for foreground modelling for the MWA EoR experiment. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-christene-lynch-icrar-curtin/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-01092021.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210825T150000
DTEND;TZID=Australia/Sydney:20210825T160000
DTSTAMP:20260522T223402
CREATED:20250819T102147Z
LAST-MODIFIED:20250819T102148Z
UID:14993-1629903600-1629907200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Nichole Barry (University of Melbourne)
DESCRIPTION:Investigating Traditional Radio Astronomy Techniques in an EoR Context\n\nAbstract\n\nDetecting the Epoch of Reionisation is a major directive of the future SKA\, and an active area of research for SKA-precursors including the MWA. However\, measuring the 21cm signal of primordial hydrogen requires a delicate intersection of precision\, sensitivity\, and advanced mathematical techniques. We investigate previous standards of radio astronomy software in order to understand their inherent level of error and to determine requirements for the MWA and subsequently the SKA. \n\n In particular\, interferometers measure millions and millions of visibilities every minute\, which live neither in image space nor fully Fourier space. Thus\, many of our analysis techniques revolve around the use of FFTs and histogramming procedures. However\, given the faint\, spectral nature of the signal we are trying to detect\, we show ways that these traditional techniques fail to reach the required precision. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-nichole-barry-university-of-melbourne/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-25082021.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210818T150000
DTEND;TZID=Australia/Sydney:20210818T160000
DTSTAMP:20260522T223402
CREATED:20250819T102205Z
LAST-MODIFIED:20250819T102205Z
UID:14994-1629298800-1629302400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Shivani Bhandari (CSIRO)
DESCRIPTION:Fast Radio Bursts with the Australian SKA Pathfinder\n\nAbstract\n\nFast radio bursts (FRBs) are amongst the most energetic transients in our Universe\, but despite several plausible models\, their origin remains a mystery. In the absence of multi-wavelength counterparts to extragalactic FRBs\, analyses of their host galaxy environments are presently the most informative path to identifying their progenitor systems. Thanks to recent advances using the Australian Square Kilometre Array Pathfinder (ASKAP) radio telescope we can now routinely localise FRBs to the galaxies they originate form\, and in some cases even pinpoint the burst to a region within the galaxy. In addition\, localising FRBs to their host galaxies allows us to use them as probes to trace the ionised gas in galaxy haloes\, large-scale structure and the inter-galactic medium. In this talk\, I will briefly review our current understanding of the FRB phenomena\, highlighting the role of FRB searches and localisation with ASKAP. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-shivani-bhandari-csiro/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-18082021.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210721T150000
DTEND;TZID=Australia/Sydney:20210721T160000
DTSTAMP:20260522T223402
CREATED:20250819T102244Z
LAST-MODIFIED:20250819T102245Z
UID:14995-1626879600-1626883200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Danny Price & Marcin Sokolowski (ICRAR / Curtin)
DESCRIPTION:A High-Speed All-Sky Monitor for Fast Radio Bursts and Technosignatures\n\nAbstract\n\nFast Radio Bursts (FRB) are one of the most intriguing transient phenomena discovered in the recent years\, and recently observed down to 100-MHz frequencies. I will present the first southern hemisphere all-sky real-time imaging and radio-transient monitoring system\, implemented on two prototype stations of the low frequency (50–350 MHz) component of the Square Kilometre Array (SKA-Low)\, the Engineering Development Array 2 (EDA2) and Aperture Array Verification System 2 (AAVS2). For the last two years these prototypes have been regularly collecting data to verify their performance against the SKA-Low specifications and simulations\, including making all-sky images every two seconds used for transient searches. The transient identification algorithm used 2-second difference images to find candidates and required their detection in the images from both stations. In approximately 360 hours of data using a single coarse channel (0.926 MHz bandwidth)\, we identified a few episodes of extremely bright pulses from the pulsar PSR B0950+08 and several transients from an unknown object\, which is currently under investigation. We also determined preliminary upper limits on surface density of radio transients at a 2-second timescale. We plan to increase the bandwidth by at least 40 times (to about 40 MHz) and time resolution to 10 ms or better in order to improve the sensitivity by two orders of magnitude and start detecting hundreds of FRBs per year. This upgrade will transform the stations into low-frequency FRB survey machines looking for FRBs and signals from extraterrestrial intelligence in high-resolution all-sky images\, which will pave the way to similar searches with hundreds of SKA-Low stations. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-danny-price-marcin-sokolowski-icrar-curtin/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-21072021.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210707T150000
DTEND;TZID=Australia/Sydney:20210707T160000
DTSTAMP:20260522T223402
CREATED:20250819T102351Z
LAST-MODIFIED:20250819T102352Z
UID:14996-1625670000-1625673600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: JinLin Han (NAOC)
DESCRIPTION:The FAST Galactic Plane Pulsar Snapshot survey\n\nAbstract\n\nThe Five-hundred-meter Aperture Spherical radio Telescope (FAST)\, that incorporates an L-band 19-beam receiver with a system temperature of about 20 K\, is the most sensitive radio telescope utilized for discovering pulsars. We designed the snapshot observation mode for a FAST key science project\, the Galactic Plane Pulsar Snapshot (GPPS) survey. The integration time for each pointing is 300 seconds so that the GPPS observations for a cover can be made in 21 minutes. The goal of the GPPS survey is to discover pulsars within the Galactic latitude of ±10deg from the Galactic plane\, and the highest priority is given to the inner Galaxy within ±5deg. \n\nUp to now\, the GPPS survey has discovered 212 pulsars\, including currently the faintest pulsars which cannot be detected by other telescopes\, pulsars with extremely high dispersion measures (DMs) which challenge the currently widely used models for the Galactic electron density distribution\, pulsars coincident with supernova remnants\, 42 millisecond pulsars\, 17 binary pulsars\, some nulling and mode-changing pulsars and rotating radio transients (RRATs). The follow-up observations for confirmation of new pulsars have polarization-signals recorded for polarization profiles of the pulsars. Re-detection of previously known pulsars in the survey data also leads to significant improvements in parameters for 64 pulsars. The GPPS survey discoveries are published and will be updated at http://zmtt.bao.ac.cn/GPPS/. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-jinlin-han-naoc/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-07072021.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210616T150000
DTEND;TZID=Australia/Sydney:20210616T160000
DTSTAMP:20260522T223402
CREATED:20250819T102425Z
LAST-MODIFIED:20250819T102426Z
UID:14997-1623855600-1623859200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: James Miller-Jones (ICRAR / Curtin)
DESCRIPTION:Inefficient stellar winds from a massive black hole progenitor in the X-ray binary system Cygnus X-1\n\nAbstract\n\nThe high-mass X-ray binary system Cygnus X-1 contains one of the first known and best-studied black holes. We recently refined the distance to the source using astrometric very long baseline interferometry observations. The new distance implied that the component masses needed to be revised upwards\, with our modelling showing that the system hosts a 21-solar mass black hole. The formation of such a massive black hole in a Galactic environment with roughly solar metallicity challenges existing model prescriptions for the wind mass loss rates from massive stars. I will discuss our new measurements and their consequences for the likely formation and subsequent evolutionary pathway of the black hole\, and touch on their implications for massive star evolution and the formation of gravitational-wave sources. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-james-miller-jones-icrar-curtin/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-16062021-scaled.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210602T150000
DTEND;TZID=Australia/Sydney:20210602T160000
DTSTAMP:20260522T223402
CREATED:20250819T102456Z
LAST-MODIFIED:20250820T022746Z
UID:14998-1622646000-1622649600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Michael Busch (Johns Hopkins University)
DESCRIPTION:Revealing the Galactic Dark H2 with OH\n\nAbstract\n\nThe intersection between the atomic and molecular interstellar medium (ISM) is still relatively mysterious. In the past two decades\, indirect gas tracers such as gamma-ray and dust emission have implied the existence of abundant molecular hydrogen (H2) not traced by our canonical molecular tracer\, the CO molecule. This H2 likely lies in diffuse clouds where CO will be not sufficiently collisionally excited or even photodissociated. I will discuss recent efforts in using the OH molecule in emission at 18cm to trace the large-scale Galactic dark H2\, and what we have learned about this previously invisible phase of the diffuse molecular ISM through ultra-sensitive (RMS ~ 1mK) 18cm OH emission surveys with the 100m Green Bank Telescope (GBT). Sensitive OH observations serendipitously revealed an immense amount of dark H2 in the Outer Galaxy in the form of a diffuse disk\, co-spatial with the atomic phase as traced by the HI 21cm line. I will also discuss upcoming GBT projects using the optically thin OH lines as a tool to investigate Galactic structure and present the (preliminary) first detection of thermal OH emission in another Galaxy (M31). \nWatch recording\nSlides\n\nRevealing the Galactic Dark H2 with OHDownload\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-michael-busch-johns-hopkins-university/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-02062021.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210526T150000
DTEND;TZID=Australia/Sydney:20210526T160000
DTSTAMP:20260522T223402
CREATED:20250819T102534Z
LAST-MODIFIED:20250820T022241Z
UID:14999-1622041200-1622044800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Ray Norris (Western Sydney University / CSIRO)
DESCRIPTION:Indigenous Australian Astronomy and Navigation\n\nAbstract\n\nAboriginal people in Australia have a rich astronomical tradition such as the “Emu in the Sky” constellation of dark clouds\, and stories about the Sun\, Moon\, and stars\, revealing a depth and complexity of pre-contact Aboriginal cultures which are not widely appreciated by outsiders. Not only did they know the sky intimately\, but they were familiar with planetary motions\, tides\, and eclipses. Their songs and stories show that Aboriginal Australians sought to understand their Universe in a similar way to modern science. They used this knowledge of the sky to construct calendars\, songlines\, and other navigational tools\, enabling them to navigate across the country\, trading artefacts and sacred stories. \nWatch recording\nSlides\n\nAboriginalAstronomy_50mins_CASS_2021May26Download\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-ray-norris-western-sydney-university-csiro/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-26052021.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210519T150000
DTEND;TZID=Australia/Sydney:20210519T160000
DTSTAMP:20260522T223402
CREATED:20250819T102603Z
LAST-MODIFIED:20250820T022041Z
UID:15000-1621436400-1621440000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Lankeswar Dey (TIFR)
DESCRIPTION:Confirming the presence of a supermassive black hole binary in OJ 287 using multi-wavelength observations\n\nAbstract\n\nThe observed quasi-periodic doubly peaked high-brightness flares in the 130-year long optical lightcurve of blazar OJ 287 is best explained by its binary black hole (BBH) central engine model\, where a supermassive secondary black hole (BH) orbits a more massive primary BH in a relativistic eccentric orbit. In this model\, the doubly peaked flares arise due to impacts of the secondary BH with the accretion disk of the primary twice every orbit. This model is successful in predicting the starting time of the last three flares\, and the latest one was observed during August 2019 with the Spitzer space telescope. The observations of these predicted flares strongly suggest the presence of an SMBHB that inspirals due to the emission of nano-Hz gravitational waves (GWs) as the central engine of OJ 287. Additionally\, the high-resolution Very Long Baseline Interferometry (VLBI) observations of OJ 287 reveal that its radio jet’s position angle (PA) exhibits systematic temporal variations. These variations can arise from the precession of the radio jet of OJ 287 due to the binary nature of its central engine. A recent analysis reveals that the BBH central engine model\, primarily developed from the optical observations\, can naturally explain the temporal variations in the radio jet PA of OJ 287\, observed at 86\, 43\, and 15 GHz frequencies. Furthermore\, the ongoing and future Global mm-VLBI Array (GMVA) campaigns on OJ 287 have the potential to firmly establish the validity of our model. These considerations make OJ 287 an excellent candidate for the nascent field of multimessenger nano-Hz GW astronomy\, expected to be inaugurated by the International Pulsar Timing Array (IPTA) consortium during the present decade. \nWatch recording\nSlides\n\nCSIRO OJ 287 seminarDownload\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-lankeswar-dey-tifr/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-19052021.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210512T150000
DTEND;TZID=Australia/Sydney:20210512T160000
DTSTAMP:20260522T223402
CREATED:20250819T102631Z
LAST-MODIFIED:20250820T032816Z
UID:15001-1620831600-1620835200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Guillaume Drouart (ICRAR / Curtin)
DESCRIPTION:Toward the first sample of radio powerful AGN in the EOR\n\nAbstract\n\nWith the very recent discovery of radio luminous AGN at z>6\, a new window of opportunity is finally opening in the study of the galaxy evolution at the end of the Epoch of Reionization. Our pilot programme in the 60 deg^2 GAMA-09 field uses a new selection technique taking advantage of the large frequency coverage of GLEAM by selecting compact\, steep and curved sources at low-frequency (70-230MHz). Out of four candidates\, one new powerful radio galaxy\, 0856+0224\, is confirmed at z=5.55\, finally overtaking the z=5.2 20 year-old record for distant radio galaxies (albeit just falling short of the new recent z=5.7 record). Interestingly\, 0856+0224 presents similarities with existing z<5 redshift samples\, giving confidence in the success of our selection technique. Our recent progress on a second source\, 0917-0012\, thanks to the extensive multi-wavelength coverage from follow-up observations with ALMA and JVLA\, supplemented with publicly available data\, place this source at a promising z>5. I will also discuss the refinement of our selection technique over the full 1200 deg^2 sky area covered by the ESO VIKING near-infrared survey\, leading to 55 new high-redshift candidates. This sample aims to provide us with the first statistically significant radio luminous active galactic nuclei sample at z > 6.5 during the Epoch of Reionization. The nature of radio selection presents the advantage of being insensitive to orientation-dependent obscuration\, it allows us (i) to study simultaneously the co-evolution of the supermassive black hole and host galaxy and (ii) to enable the study of the IGM through the HI absorption line. \n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-guillaume-drouart-icrar-curtin/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-12052021.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210505T150000
DTEND;TZID=Australia/Sydney:20210505T160000
DTSTAMP:20260522T223402
CREATED:20250819T102706Z
LAST-MODIFIED:20250820T021946Z
UID:15002-1620226800-1620230400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: David Gozzard (ICRAR / UWA)
DESCRIPTION:Phase Stabilization for Space Science Applications: from radio telescopes to laser communications\n\nAbstract\n\nThe distribution of high-precision time and frequency signals from atomic clocks is indispensable for many fields of fundamental and applied science. Timescale comparison between atomic clocks enables the highest-precision tests of foundational physics including tests of the General Theory of Relativity\, the variability of fundamental constants\, and searches for dark matter candidates. Radio astronomy\, geodesy\, and global navigation satellite systems also benefit from networks of atomic clocks. In order to fully exploit the precision of the atomic clocks\, the transmission link must be more stable than the atomic clocks themselves. However\, disturbances on the link (thermal effects and vibration\, in the case of an optical fibre\, and atmospheric turbulence\, in the case of a free-space link) cause phase and amplitude noise that greatly degrade the precision of the transmission. \n\n This talk will begin with an overview of stabilized frequency transfer technology developed by the ICRAR-UWA Astrophotonics group to phase synchronize the antennas of the SKA telescope. The talk will then cover how this technology is being translated to stabilize ground-to-space laser links for fundamental science and high-bandwidth laser communications applications. \nWatch recording\nSlides\n\nGozzard_CSIRO2021_v1Download\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-david-gozzard-icrar-uwa/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-05052021-scaled.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210428T150000
DTEND;TZID=Australia/Sydney:20210428T160000
DTSTAMP:20260522T223402
CREATED:20250819T102751Z
LAST-MODIFIED:20250819T102751Z
UID:15003-1619622000-1619625600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Noor Masdiana Md Said (University of Tasmania / CSIRO)
DESCRIPTION:Intra-Day Variability of Active Galaxies\n\nAbstract\n\nIn this work I have undertaken a detailed investigation of the BL Lac object PKS B1144−379. This project utilised high-cadence flux density monitoring of interstellar scintillation with the University of Tasmania Ceduna 30m radio telescope at a frequency of 6.7 GHz. A complementary kinematic study of the sub parsec-scale jet of PKS B1144−379 has been undertaken\, using 8.6 GHz Very Long Baseline Interferometry (VLBI) data. The centimetre wavelength radio flux density of this source is known to vary on a range of timescales from a few days up to several months. The rapid (timescales of less than a day)\, apparent variability of this compact extragalactic radio source at radio wavelength is known as intraday variability (IDV). The current investigation shows conclusively that the rapid variability is the result of a propagation effect known as interstellar scintillation (ISS)\, which originates in the inhomogeneous interstellar medium (ISM). On the other hand\, the long-term variability (months to years) suggests that the source also exhibits substantial intrinsic evolution. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-noor-masdiana-md-said-university-of-tasmania-csiro/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-28042021.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210310T150000
DTEND;TZID=Australia/Sydney:20210310T160000
DTSTAMP:20260522T223402
CREATED:20250819T102837Z
LAST-MODIFIED:20250819T102838Z
UID:15004-1615388400-1615392000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Dougal Dobie (Swinburne)
DESCRIPTION:Radio Follow-up of Gravitational Wave Events\n\nAbstract\n\nThe detection of gravitational waves and electromagnetic radiation from a neutron star merger\, GW170817\, heralded the dawn of a new age of astronomy – the multi-messenger era. In this talk\, I will discuss follow-up of two landmark gravitational wave events – GW170817 and GW190814. Radio monitoring of GW170817 enabled tight constraints to be placed on the geometry and energetics of the merger\, while VLBI imaging helped improve the “standard siren” measurement of the Hubble constant. No counterpart to GW190814 has been detected\, but we have carried out 8 follow-up observations with ASKAP\, covering ~90% of the localisation region. We have used these observations to carry out the most sensitive widefield radio transient survey to-date\, and I will also present preliminary results from this search. I will outline prospects for radio follow-up of future gravitational wave events including the vital contributions that radio observations can make to the broader multi-messenger effort\, and quantitative estimates for the detectability of events with current and future facilities. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-dougal-dobie-swinburne/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-10032021-scaled.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210303T150000
DTEND;TZID=Australia/Sydney:20210303T160000
DTSTAMP:20260522T223402
CREATED:20250819T102906Z
LAST-MODIFIED:20250820T021513Z
UID:15005-1614783600-1614787200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Nithyanandan Thyagarajan (CSIRO)
DESCRIPTION:Geometric Intuition and Image-plane Methods for Measuring Closure Phases in Interferometry\n\nAbstract\n\nIn interferometric applications\, closure phase refers to the phase of the product of spatial coherences obtained around a closed loop of interferometer elements. Its property of invariance to image-plane translation as well as to phase corruption due to the propagation and element-based instrumental effects\, has been well-known for several decades. The property that this can be measured robustly even using raw and uncalibrated interferometric data makes it a true measurable physical property of the object being imaged\, particularly of the degree of symmetry in the object’s morphology. Therefore\, it has been a valuable tool in challenging interferometric applications that otherwise require high-accuracy phase calibration. Interesting astronomical applications include the Event Horizon Telescope (EHT) imaging of the supermassive black hole event horizon at the centre of M87 using very long baseline interferometry\, an independent approach to statistical detection of redshifted 21 cm power spectrum of neutral Hydrogen during the epoch of reionization\, and optical imaging of stellar surfaces. \n\n Until now\, the understanding of interferometric closure phase has been limited to a mathematical description that gets applied primarily in the aperture-plane (the Fourier domain of the image-plane). However\, a geometrical intuition for this valuable physical quantity has been lacking. I will present the Shape-Orientation-Size (SOS) conservation theorem in the image plane\, which forms the foundation for such an insight. Two geometric methods will be described to measure the closure phase directly from images (without requiring a Fourier- or aperture-plane view) – one using the positional offset of one fringe relative to the other two\, and the other estimated from the areas of the triangles in the aperture and image planes. I will demonstrate this understanding using real data from the Jansky Very Large Array (VLA) and the EHT. These relationships are further generalized to N-element interferometers. \n\n The geometric understanding provided herein can be potentially valuable to optical interferometry and other interferometric applications. I will outline some of these applications including crystallography\, seismic imaging\, interferometric synthetic aperture radar (InSAR)\, synthetic aperture sonar (SAS)\, gravitational wave detection with LISA\, and quantum mechanics and polarized states of light. \n\nSlides\n\nClosurePhaseGeometricInsight_NT_notesDownload\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-nithyanandan-thyagarajan-csiro-2/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-03032021.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210224T150000
DTEND;TZID=Australia/Sydney:20210224T160000
DTSTAMP:20260522T223402
CREATED:20250819T102934Z
LAST-MODIFIED:20250819T102935Z
UID:15006-1614178800-1614182400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: James Murray (AAL)
DESCRIPTION:AAL Membership Update\n\nAbstract\n\nAAL will be presenting a general update on their activities of the past year or so\, as well as current projects and funding arrangements. There have been some staff and Board changes since we last updated the team at CASS\, so we will touch on these as well. The update will be general in nature\, but will also show CSIRO’s involvement with AAL via committee and member representatives. The presentation will also serve to introduce AAL to new staff at CASS Marsfield or provide a refresher for those within the department who haven’t been in touch with us for a while. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-james-murray-aal/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-24022021.jpg
END:VEVENT
END:VCALENDAR