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DTSTART;TZID=Australia/Sydney:20260204T150000
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DTSTAMP:20260520T013055
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
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DTSTART;TZID=Australia/Sydney:20260225T120000
DTEND;TZID=Australia/Sydney:20260225T130000
DTSTAMP:20260520T013055
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
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