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DTSTART;TZID=Australia/Sydney:20220907T150000
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DTSTAMP:20260516T173133
CREATED:20250819T074311Z
LAST-MODIFIED:20250819T074312Z
UID:14967-1662562800-1662566400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Anita Petzler (CSIRO)
DESCRIPTION:Hydroxyl as a  probe of the interstellar medium\n\nAbstract\n\nThe molecular gas of the interstellar medium provides the raw material for star formation\, yet its principle component – molecular hydrogen – is essentially invisible at radio wavelengths. Instead\, we must infer its presence and properties through the study of other tracer molecules\, such as hydroxyl (OH). OH\, with its four ground-rotational transitions at 1612\, 1665\, 1667 and 1720 MHz is a challenging molecule to observe due both to the weakness of its lines and the complexity of their excitation. However\, the complex excitation of OH holds valuable information about the host molecular gas. The satellite lines at 1612 and 1720 MHz in particular\, with their ubiquitous anomalous excitation\, are much more sensitive to local conditions than the main lines which rarely diverge from their expected excitation at local thermodynamic equilibrium (LTE). In this talk\, I will discuss my PhD research which focused on exploring the utility of this interesting molecule. I will also introduce my current project which is to monitor the time-variability of high-gain OH masers in star-forming regions. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-anita-petzler-csiro/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-07092022.jpg
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DTSTART;TZID=Australia/Sydney:20220914T150000
DTEND;TZID=Australia/Sydney:20220914T160000
DTSTAMP:20260516T173133
CREATED:20250819T074217Z
LAST-MODIFIED:20250819T074218Z
UID:14966-1663167600-1663171200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Stella Ocker (Cornell)
DESCRIPTION:Scattering horizons for Fast Radio Bursts\n\nAbstract\n\nFast radio bursts (FRBs) flicker across the sky at millisecond timescales thousands of times per day. Despite their unknown origins\, the chromatic propagation effects FRBs experience along their journeys to the observer can be used to probe the distribution and turbulence of ionized gas from the Milky Way to their host galaxies. FRB scattering\, in particular\, is sensitive to small-scale electron density fluctuations that are inaccessible to many other observational probes. In this talk\, I will discuss current constraints on scattering in the circumgalactic medium and FRB host galaxies\, and the implied prospects for probing these respective media with a large future sample of FRBs. In addition\, I will discuss modelling of the cumulative scattering from the Milky Way to host galaxies for FRBs at redshifts > 1\, which suggests that scattering may undermine the use of FRBs as probes of galaxies and cosmology from near the peak of cosmic star formation to the epoch of reionization. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-stella-ocker-cornell/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-14092022.jpg
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DTSTART;TZID=Australia/Sydney:20220921T150000
DTEND;TZID=Australia/Sydney:20220921T160000
DTSTAMP:20260516T173133
CREATED:20250819T074126Z
LAST-MODIFIED:20250819T074127Z
UID:14965-1663772400-1663776000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Tristan Reynolds (ICRAR/UWA)
DESCRIPTION:Hopping into a new era of extragalactic radio astronomy with WALLABY\n\nAbstract\n\nNeutral hydrogen (HI) gas provides the reservoir for future star formation and is important to understanding how galaxies form and evolve. HI in galaxies is abundant\, relatively easy to detect and provides a wealth of information on the host galaxy including distance\, mass and density\, motion (e.g. rotation) and the influence of the local environment. Current HI datasets are limited in the total number of galaxies detected and spatial resolution\, but this is about to change thanks to the next-generation HI surveys on Square Kilometre Array pathfinders\, including WALLABY. WALLABY will be transformational in our understanding of the HI content of galaxies through detecting ~210\,000 galaxies in HI and spatially resolving HI in several thousand of galaxies over the Southern sky. I will provide an update on the current status of the WALLABY survey. I will also present some of my recent WALLABY results in which I take advantage of the spatial resolution to study the interplay between environment\, HI content and galaxies’ stellar and star forming quantities. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-tristan-reynolds-icrar-uwa/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-21092022.jpg
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