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DTSTART;TZID=Australia/Sydney:20251121T080000
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DTSTAMP:20260609T200438
CREATED:20251203T010158Z
LAST-MODIFIED:20251203T010415Z
UID:16319-1763712000-1765904400@www.atnf.csiro.au
SUMMARY:Apply for the 2026APR semester
DESCRIPTION:Overview\n\nWe’re pleased to announce that proposals for ATNF observing time are now open for the 2026APR semester. Grab your chance to use some of our new receivers and facilities. \n\nApply now for: \n\n\nOur ASKAP radio telescope (including CRACO)\n\n\n\nOur Australia Telescope Compact Array\n\n\n\nMurriyang\, our 64-m Parkes radio telescope\n\n\n\nThe Tidbinbilla radio antennas: the 70-m antenna Ballima (DSS-43) \, and the 34-m (DSS-34) antenna;\n\n\n\nThe Long Baseline Array\n\n\nMark your calendars: the deadline for all proposals is 06:00 UT (17:00 Sydney local time) on Tuesday\, 16 December 2025. \n\nTo submit your proposal\, visit our online proposal application system\, OPAL. \nMore information\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/apply-for-the-2026apr-semester/
LOCATION:WA
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/09/E9A915740-OBERSVERS-6-scaled.jpg
ORGANIZER;CN="George Hobbs":MAILTO:george.hobbs@csiro.au
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DTSTART;TZID=Australia/Sydney:20251121T110000
DTEND;TZID=Australia/Sydney:20251121T120000
DTSTAMP:20260609T200439
CREATED:20251117T221855Z
LAST-MODIFIED:20251120T051718Z
UID:16167-1763722800-1763726400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Anna Ivleva (Observatory of Munich / Ludwig Maximilian University)
DESCRIPTION:Odd Radio Circles (ORCs): probing radio features at group scales with simulations\n\nAbstract: \n\nExtragalactic radio astronomy has proven to be immensely useful in the study of high energy particle physics by constraining the acceleration of cosmic ray electrons and their subsequent synchrotron emission. Investigations of galaxy clusters have shown to be particularly fruitful\, since such massive environments grant favourable conditions for efficient particle acceleration via merger driven shocks. Yet\, a new class of radio objects discovered only a few years ago imposes the question if also merger shocks in less massive systems can accelerate CR electrons to GeV energies. Specifically\, a growing number of observations is pointing towards the existence of ringlike features around small galaxy groups  and even Milky Way-like objects\, accordingly titled Odd Radio Circles (ORCs). Recent works have proposed that these could be interpreted as radio analogs to the merger shocks observed in more massive systems. However\, ORCs are appearing in a colder and less magnetized medium than the radio features in galaxy clusters\, challenging particle acceleration  mechanisms in more constraining environments. Now\, by interpreting multiple observed ORCs at different stages as an evolutional time sequence and comparing them to simulations of such systems\, one can infer underlying properties of these unique features\, while simultaneously testing the limits of diffusive shock acceleration (DSA). To this end\, I will present the first of its kind magnetohydrodynamical simulation of a galaxy group\, utilising on-the-fly treatment of spectral cosmic rays. I will study the emerging radio features and discuss both similarities and differences to the observed counterparts. Finally\, I will review the relative importance of DSA in the formation of ORCs compared to galactic sources of high energy particles\, such as supernovae and AGN. \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-ivleva-observatory-of-munich-ludwig-maximilian-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/2025/11/talk_graphic.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
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