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DTSTART;TZID=Australia/Sydney:20230412T150000
DTEND;TZID=Australia/Sydney:20230412T160000
DTSTAMP:20260515T120929
CREATED:20250819T061431Z
LAST-MODIFIED:20250819T061432Z
UID:14889-1681311600-1681315200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Chandra Murugesan (CSIRO)
DESCRIPTION:Resolved neutral atomic hydrogen (HI) gas studies to reveal the impact of intrinsic and environmental processes on Chandra Murugesan\n\nAbstract\n\nNeutral atomic Hydrogen (HI) gas is the fundamental reservoir from which stars in galaxies are eventually formed. As such\, studying the HI gas properties in galaxies give us important insights into how star formation proceeds. In addition\, the HI gas is affected by internal mechanisms/processes such as angular momentum (AM)\, star formation/AGN feedback\, disk instabilities\, as well as non-axisymmetric potentials such as bars. On the other hand\, the HI gas is also sensitive to (external) environmental processes such as tidal and ram-pressure stripping. Disentangling the degree of influence of these processes on the HI gas is paramount. In this talk I will show the importance of resolved HI studies in decoding the effects of both internal and external processes on galaxy evolution. By virtue of the extended nature of the HI disks in galaxies\, one can derive rotation curves out to many times their optical radii\, making high-resolution HI studies very important for tracing the total AM in galaxies. I will present the AM – Mass relation for local galaxies which is fundamental for constraining our cosmological models. In addition\, I will talk about the connection between AM\, disk stability and HI gas fraction in galaxies. Drawing from the results of a new HI survey of ring galaxies\, I will also highlight the effects of bars in redistributing the HI gas and star formation in galaxies. Finally\, I will present some new data is being delivered by the ASKAP WALLABY HI survey and the impact this is likely to have on HI and AM studies of galaxies in the local Universe as we venture into the SKA era. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-chandra-murugesan-csiro/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-12042023.png
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DTSTART;TZID=Australia/Sydney:20230419T150000
DTEND;TZID=Australia/Sydney:20230419T160000
DTSTAMP:20260515T120929
CREATED:20250819T103612Z
LAST-MODIFIED:20250819T103612Z
UID:15088-1681916400-1681920000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Caroline Foster (UNSW)
DESCRIPTION:Challenges in understanding the dynamical evolution of galaxies\n\nAbstract\n\nIn this talk\, I will discuss the dynamical transformation of galaxies across cosmic time. I will explore common barriers to and possible solutions for the accurate measurement and determination of the dynamical evolution of galaxies. I will focus on the necessity of changing dynamical probes / baryonic phases (neutral gas\, ionised gas and stars) depending on the cosmic epoch or redshift. \n\n In the first instance\, I will discuss our attempt at quantifying and correcting for the impact of the progenitor bias with redshift using cosmological simulations. I will next address the implications of recent results on the dynamical coupling (or otherwise) of ionised gas and stars in galaxies on our ability to accurately infer dynamical evolution from observations at different epochs. Finally\, I will outline how the Middle-Ages Galaxy Properties with Integral field spectroscopy (MAGPI) Survey was designed to explicitly overcome some of these barriers and show a selection of initial results. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-caroline-foster-unsw/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-19042023.png
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DTSTART;TZID=Australia/Sydney:20230426T150000
DTEND;TZID=Australia/Sydney:20230426T160000
DTSTAMP:20260515T120929
CREATED:20250819T073055Z
LAST-MODIFIED:20250819T073056Z
UID:14929-1682521200-1682524800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Jayender Kumar (CSIRO)
DESCRIPTION:The dynamics and 3D structure of the Galactic long bar\n\nAbstract\n\nUnderstanding the 3D structure and associated dynamics of the inner 4-kpc of the Milky Way is very challenging because of high obscuration at optical wavelengths and our ability to accurately measure the distance and 3D motions of sources at these distances. \n\nIn this work\, we measured parallax and proper motions of three 22.2 GHz water masers\, each associated with a High-Mass Star-Forming Region (HMSFR) in the first quadrant of the Milky Way. With these measurements combined with other BeSSel projects’ published and un-published parallax and proper motion measurements of maser sources associated with HMSFRs within the 4 kpc region of the Galactic centre\, we present evidence that the young HMSFRs in the inner galaxy are located in the gases following ’quasi-elliptical’ orbits. These represent the first direct measurements of the dynamics of the Milky Way’s bar. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-jayender-kumar-csiro/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-26042023-scaled.jpg
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