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DTSTART;TZID=Australia/Sydney:20211103T150000
DTEND;TZID=Australia/Sydney:20211103T160000
DTSTAMP:20260515T191822
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/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-03112021.png
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DTSTART;TZID=Australia/Sydney:20211110T150000
DTEND;TZID=Australia/Sydney:20211110T160000
DTSTAMP:20260515T191822
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/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-10112021.jpg
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DTSTART;TZID=Australia/Sydney:20211124T150000
DTEND;TZID=Australia/Sydney:20211124T160000
DTSTAMP:20260515T191822
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/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-24112021.jpg
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