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DTSTART;TZID=Australia/Sydney:20220511T150000
DTEND;TZID=Australia/Sydney:20220511T160000
DTSTAMP:20260516T164349
CREATED:20250819T075504Z
LAST-MODIFIED:20250820T032648Z
UID:14976-1652281200-1652284800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Manisha Caleb (University of Sydney)
DESCRIPTION:Exploring the transient landscape with MeerKAT\n\nAbstract\n\nFast radio bursts (FRBs) have a story which has been told and retold many times over the past few years as they have sparked excitement and controversy since the pioneering discovery in 2007. The FRB class encompasses a number of microsecond-millisecond duration pulses occurring at Galactic to cosmological distances with energies spanning several orders of magnitude. While most FRBs have been observed as singular events\, a small fraction of them have been observed to repeat over various timescales leading to an apparent dichotomy in the population. Though ~50 progenitor model theories have been proposed with the majority involving neutron stars\, no consensus has emerged for their origin(s). However\, with the discovery of an FRB-like pulse from the Galactic magnetar SGR J1935+2154\, magnetar engine models appear to be the current leading favourite. In this talk\, I will present an overview of the field of FRBs and the recent results from the MeerTRAP project at the MeerKAT radio telescope. \n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-manisha-caleb-university-of-sydney/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-11052022.jpg
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220518T150000
DTEND;TZID=Australia/Sydney:20220518T160000
DTSTAMP:20260516T164349
CREATED:20250819T075355Z
LAST-MODIFIED:20250819T075355Z
UID:14975-1652886000-1652889600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Kelly Gourdji (Swinburne)
DESCRIPTION:LOFAR observations of neutron star mergers\n\nAbstract\n\nBoth coherent and incoherent low-frequency radio emission are predicted at various timescales when neutron stars coalesce. In this talk\, I show how the Low-Frequency Array (LOFAR) is being used to catch both fast and slow radio transients related to neutron star mergers. At the earliest timescales\, coherent emission resembling FRBs is predicted by several theoretical models. Testing these models can shed light on the nature of the merger remnant and other important questions\, but requires rapid triggered observations. Here\, I show how we are using LOFAR to trigger on short gamma-ray bursts (SGRBs) detected by Swift\, which have neutron star merger progenitors. In addition to possible prompt emission\, there will be a long-lasting synchrotron afterglow caused by the merger ejecta’s interaction with the ambient medium. The afterglow contains a wealth of information including the geometry and energy of the merger outflow. The biggest challenge associated with detecting the electromagnetic counterpart of gravitational wave (GW) merger events\, however\, is the large uncertainty (tens-hundreds of square degrees) on their locations. Here\, I demonstrate our strategy which applies LOFAR’s high sensitivity and large field of view to search for GW merger radio counterparts. I present results from LOFAR follow-up observations of merger events from the last GW observing run. I also show how the high sensitivity\, large field of view and range of epochs permit us to probe previously unexplored parts of general radio transient phase space. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-kelly-gourdji-swinburne/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-18052022.jpg
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DTSTART;TZID=Australia/Sydney:20220525T150000
DTEND;TZID=Australia/Sydney:20220525T160000
DTSTAMP:20260516T164349
CREATED:20250819T075315Z
LAST-MODIFIED:20250819T075315Z
UID:14974-1653490800-1653494400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Ron Ekers (CSIRO)
DESCRIPTION:A brief history of the discovery of Sgr A*\n\nAbstract\n\nThe discovery of radio emission from the centre of our galaxy leading up to the EHT image of the SgrA* black hole is a story of discovery\, controversy\, serendipity\, black holes\, Nobel prizes\, mysterious patterns around the galactic centre and now the EHT black hole image magic. The initial discovery of the radio source Sagittarius A and its association with the centre of the Milky Way is a fascinating story\, involving CSIRO-RPL personnel and prominent US and Dutch astronomers. But by “discovery” I do not mean a single event. Contrary to the conventions in science that award prizes\, professional respect and makes press releases\, discovery is a lengthy process involving many actors\, many different kinds of contributions\, and many events over a period of time — 70 years in the case of the galactic centre! I will conclude with a summary of the EHT result and my views on this very difficult analysis. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-ron-ekers-csiro-2/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-25052022.jpg
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