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DTSTART;TZID=Australia/Sydney:20240703T150000
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DTSTAMP:20260515T234044
CREATED:20250819T053558Z
LAST-MODIFIED:20250819T053558Z
UID:14871-1720018800-1720022400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Monserrat Martinez (Swinburne)
DESCRIPTION:The role of AGN in regulating galaxy evolution in massive z~3-4 galaxies\n\nAbstract\n\nAn excess of massive quiescent galaxies (MQGs) is found at the early universe (z~3-4). MQGs at this epoch suggest their stellar content was already in place in the first 1.5 Gyr of the Universe. These findings indicate that MQGs must have experienced an event that caused rapid quenching. Although observational evidence is scarce\, AGNs are the most suitable candidate for quenching these galaxies. In this talk\, we present a sample of massive galaxies (10 < log(𝑀★/𝑀⊙ ) < 11) at 3 < z < 4 from JWST NIRSpec and the ZFOURGE survey with K–band spectra of the Keck/MOSFIRE\, VLT/KMOS. We find that a large fraction have strong [OIII]5007 and H𝛽 emission lines with large line widths (𝜎 100 – 450 km/s). These results show a significantly high AGN fraction in massive galaxies\, ranging from 60–70%\, pointing to the period between 3 < z < 4 being a time of heightened activity for the development of supermassive black holes in the massive end of the galaxy population and provide evidence for their role in the emergence of the first massive quenched galaxies at this epoch. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-monserrat-martinez-swinburne/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-03072024.jpg
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20240710T150000
DTEND;TZID=Australia/Sydney:20240710T160000
DTSTAMP:20260515T234044
CREATED:20250819T053450Z
LAST-MODIFIED:20250819T053450Z
UID:14872-1720623600-1720627200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Patricia Forster
DESCRIPTION:Western Australia Aboriginal Astronomy\n\nAbstract\n\nTraditionally\, Aboriginal people used objects in the sky to establish direction\, guide navigation\, predict seasons and as calendars for planning social life. Their narratives linked objects in the sky to life and landforms on earth and frequently included a moral element. This talk will draw on less publicized aspects of WA Aboriginal Astronomy from my review of the topic published by Cambridge University Press for the Astronomical Society of Australia. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-patricia-forster/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-10072024.jpg
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20240717T150000
DTEND;TZID=Australia/Sydney:20240717T160000
DTSTAMP:20260515T234044
CREATED:20250819T053315Z
LAST-MODIFIED:20250819T053315Z
UID:14873-1721228400-1721232000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Apurba Bera (ICRAR/Curtin)
DESCRIPTION:The curious case of twin fast radio bursts detected in the ASKAP-CRAFT survey\n\nAbstract\n\nFast radio bursts (FRBs) are brilliant short-duration flashes of radio emission originating at cosmological distances. Vast diversity in the properties of currently known FRBs\, complex spectro-temporal structures and the fleeting nature of these events make it difficult to understand their progenitors and emission mechanism. The Commensal Real-time ASKAP Fast Transients (CRAFT) survey\, with the Australian Square Kilometre Array Pathfinder (ASKAP) radio telescope\, enables high time resolution spectro-polarimetric study of FRBs that helps us probe the physics of the emission source and its surrounding medium. In the currently available CRAFT FRB sample we identified two apparently unrelated FRBs that show remarkable resemblance in pulse shape\, rest-frame emission time-scales and polarization properties — which indicates that these two events are likely to have very similar progenitors. In this talk I will describe the observed properties of these two FRBs and discuss their possible interpretations. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-apurba-bera-icrar-curtin/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-17072024.jpg
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20240731T150000
DTEND;TZID=Australia/Sydney:20240731T160000
DTSTAMP:20260515T234044
CREATED:20250819T053237Z
LAST-MODIFIED:20250819T053238Z
UID:14874-1722438000-1722441600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Hao Ding (NAOJ)
DESCRIPTION:Enhancing the studies of reference frame ties and millisecond pulsar formation channels with LBA astrometry of millisecond pulsars\n\nAbstract\n\nMillisecond pulsars (MSPs) are the fastest-spinning neutron stars. Thanks to their superbtime-keeping ability\, MSPs have provided sharp tests of gravitational theories\, and have been collectively used to constrain the stochastic gravitational-wave background (GWB). Precise astrometric studies of MSPs are desired in many ways. In this talk\, I will mainly focus on two scientific prospects promised by MSP astrometry. Firstly\, as I will explain in the talk\, the velocity distribution of MSPs is likely multi-modal. VLBI astrometry of MSPs holds the key to constraining the MSP velocity distribution\, which is directly linked to the formation channels of MSPs. Secondly\, VLBI and timing observations of MSPs can jointly refine the connection between the kinematic and dynamic reference frames\, which would betterquantify the systematics in pulsar timing array studies. As the major VLBI network in the southern hemisphere\, the Australian Long Baseline Array is crucial for significantly enriching the astrometrically studied MSP sample. I will introduce a new LBA program focusing on MSP astrometry\, and update its progress. Alongside the scientific discussions\, I will describe the main challenges the two studies are facing\, and outline some innovations in data reduction and analysis that may help us overcome the challenges. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-hao-ding-naoj/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-31072024.jpg
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