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TZID:Australia/Sydney
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DTSTART;TZID=Australia/Sydney:20240802T150000
DTEND;TZID=Australia/Sydney:20240802T160000
DTSTAMP:20260515T113958
CREATED:20250819T053148Z
LAST-MODIFIED:20250819T053149Z
UID:14875-1722610800-1722614400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Tasso Tzioumis (CSIRO)
DESCRIPTION:34 years with CSIRO\n\nAbstract\n\nOn the occasion of his retirement from CSIRO\, Tasso Tzioumis will look back over his 34 year career in the Australia Telescope National Facility. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-tasso-tzioumis-csiro/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-02082024-scaled.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20240807T150000
DTEND;TZID=Australia/Sydney:20240807T160000
DTSTAMP:20260515T113958
CREATED:20250819T053112Z
LAST-MODIFIED:20250819T053112Z
UID:14876-1723042800-1723046400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Laura Driessen (University of Sydney)
DESCRIPTION:The Sydney Radio Star Catalogue: a new catalogue of radio stars\n\nAbstract\n\nI will present a new catalogue of 839 radio stars detected < 3 GHz: the Sydney Radio Star Catalogue (SRSC). Most of these stars were identified using ASKAP. The ASKAP stars in the SRSC were found using a range of techniques: circular polarisation searches\, proper-motion searches\, variability searches and multiwavelength cross-matching. We have also included published radio stars from e.g. MeerKAT and V-LoTSS in the SRSC. The catalogue contains stars from across the Hertzsprung-Russell diagram\, from ultra-cool dwarfs to blue supergiants to Wolf Rayets. The previous best-known radio star catalogue\, the Wendker catalogue\, contained 228 radio stars detected < 3GHz. Hence the SRSC is a big leap forward in our understanding of the population and characteristics of radio stars. I will present an overview of the SRSC catalogue\, including the search methods\, the properties and types of stars\, the X-ray-radio characteristics using eROSITA_DE observations\, and the circular polarisation properties. I will also highlight some individual objects of particular interest. I will also present a short summary of ASKAP VAST\, with some recent updates. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-laura-driessen-university-of-sydney/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-07082024.jpg
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20240814T150000
DTEND;TZID=Australia/Sydney:20240814T160000
DTSTAMP:20260515T113958
CREATED:20250819T053020Z
LAST-MODIFIED:20250819T053020Z
UID:14877-1723647600-1723651200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Orsola De Marco (AAL)
DESCRIPTION:AAL member update to CSIRO Space & Astronomy\n\nAbstract\n\nAAL is a not-for-profit organisation\, whose members are Australian universities and institutions with a significant astronomical research capability. CSIRO Space & Astronomy is one of our member institutions and we are so pleased to be delivering our member update to you all in person once more this year. During our presentation\, we will provide a quick introduction on who we are\, where our funding money comes from and where it goes. We will discuss some of our key projects\, the bid for full membership of ESO and AAL’s strategy moving forward over the next 12 to 24 months. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-orsola-de-marco-aal/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-14082024.jpg
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20240821T150000
DTEND;TZID=Australia/Sydney:20240821T160000
DTSTAMP:20260515T113958
CREATED:20250819T052823Z
LAST-MODIFIED:20250819T052823Z
UID:14878-1724252400-1724256000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Pascal Keller (Leiden Observatory)
DESCRIPTION:Investigating the Epoch of Reionisation with Radio Interferometers\n\nAbstract\n\nThe Epoch of Reionisation (EoR) marks the cosmic period during which the neutral hydrogen that pervaded the Universe transitioned to an almost entirely ionised state. The most promising probe of the EoR is the redshifted 21 cm line\, which has the potential to characterise the 3-dimensional distribution of neutral hydrogen. The statistical detection of its spatial fluctuations is a prime objective of modern low-frequency radio interferometers\, though instrumental systematics and calibration errors pose an immense challenge. In this talk\, I will discuss a calibration-independent method of detecting the cosmological signal fluctuations using the interferometric closure phase. I discuss recent developments in the interpretation of the closure phase delay power spectrum and present constraints on it obtained from a full season of HERA observations. \n\n Additionally\, I present the results of a VLA L-Band survey of 138 optically confirmed reionisation-era quasars. The survey aimed at finding quasars suitable for measuring the cosmological 21 cm signal in absorption to their bright radio emissions. The survey was further used to constrain the statistical properties of the high-redshift quasar population and their cosmic evolution. \n\n Together\, these efforts extend the required groundwork for detecting the cosmological 21 cm signal from the EoR. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-pascal-keller-leiden-observatory/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-21082024.png
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20240828T150000
DTEND;TZID=Australia/Sydney:20240828T160000
DTSTAMP:20260515T113958
CREATED:20250819T052729Z
LAST-MODIFIED:20250819T052730Z
UID:14879-1724857200-1724860800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Oliver Oayda (University of Sydney)
DESCRIPTION:Probing the Cosmic Dipole in the Radio Sky using ASKAP for Cosmology\n\nAbstract\n\nThe dipole of the Cosmic Microwave Background (“CMB”) is conventionally understood to be due to our heliocentric motion through the Universe at a speed of about 370 km/s. It is therefore called the kinematic dipole. If this interpretation is correct\, this motion should impact other observables\, for example large-scale radio galaxy surveys surveyed up to some limiting flux density. Our motion is anticipated to induce a variation in galaxy source density described by a dipole — the “cosmic dipole”. Analysing the consistency between this dipole and the kinematic dipole functions as a test of the cosmological principle\, which is the assumption that our Universe is homogeneous and isotropic on large scales. We present a Bayesian analysis of two radio galaxy surveys — RACS-low and NVSS — and find that\, even after accounting for local sources\, the dipole points roughly in the same direction as the kinematic dipole but has an amplitude 2 to 3 times larger than anticipated. This accords with other studies in the literature and represents an ongoing challenge to the kinematic interpretation of the CMB\, and therefore the cosmological principle. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-oliver-oayda-university-of-sydney/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-28082024-scaled.jpg
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