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DTSTART;TZID=Australia/Sydney:20221102T150000
DTEND;TZID=Australia/Sydney:20221102T160000
DTSTAMP:20260516T065441
CREATED:20250819T073623Z
LAST-MODIFIED:20250819T073624Z
UID:14960-1667401200-1667404800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Shanika Galaudage (Monash)
DESCRIPTION:Investigating the lives of black holes and neutron stars with gravitational waves\n\nAbstract\n\nThe field of gravitational-wave astronomy provides us with a wealth of information about the most extreme objects in the Universe. Since 2015\, there have been over 90 detections of merging black holes and neutron stars. With the growing number of gravitational wave events\, we can study the overall population of events\, allowing us to probe stellar evolution and formation mechanisms of these compact binaries. In this talk\, I describe the emerging picture of the formation of binary black hole systems using observations from LIGO-Virgo-KAGRA. I will also present some insights into the population of binary neutron stars\, and the implications for radio and gravitational-wave astronomy. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-shanika-galaudage-monash/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-02112022.jpg
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20221118T150000
DTEND;TZID=Australia/Sydney:20221118T160000
DTSTAMP:20260516T065441
CREATED:20250819T073431Z
LAST-MODIFIED:20250819T073439Z
UID:14959-1668783600-1668787200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Rick Perley (NRAO)
DESCRIPTION:MeerKAT and VLA Polarimetric Calibration – Establishing the true EVPAs of 3C286 and 3C138\n\nAbstract\n\nThe radio quasars 3C286 and 3C138 have long been used to determine the EVPAs of polarimetric imaging with the VLA. Since at least the 1960s\, it has been ‘accepted wisdom’ that the correct EVPA of 3C286 is 33 degrees at all frequencies. However\, recent VLA observations of the moon\, Venus\, and Mars have shown there are small\, but significant deviations from the presumed 33 degrees\, resulting in about a 10 degree spread between 1 and 50 GHz. Recent MeerKAT observations have confirmed this spread at their frequencies of overlap\, and strongly suggest much larger deviations to lower values are seen below 1 GHz. However\, accurate estimation of the EVPAs below ~1 GHz will require accurate corrections for ionospheric Faraday rotation\, which are currently lacking. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-rick-perley-nrao-2/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-18112022.jpg
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DTSTART;TZID=Australia/Sydney:20221123T150000
DTEND;TZID=Australia/Sydney:20221123T160000
DTSTAMP:20260516T065441
CREATED:20250819T073327Z
LAST-MODIFIED:20250819T073328Z
UID:14958-1669215600-1669219200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Quirino D'Amato (SISSA)
DESCRIPTION:High-redshift Supermassive Black Holes grow in dusty\, gas-rich environment\n\nAbstract\n\nA large fraction of supermassive black holes (SMBHs) located in Active Galactic Nuclei (AGN) at galaxy centres grow hidden by dust and gas. In the local Universe\, the obscuration is often associated with the (sub-)pc-scale circumnuclear medium surrounding the SMBH (i.e. the so-called torus)\, as postulated by the Unified Schemes. However\, deep X-ray observations have shown that the fraction of obscured AGN dramatically increases with redshift. In addition\, thanks to the revolution introduced by new (sub-)mm observatories\, in the last decade increasingly detections of the dusty\, gas-rich interstellar medium (ISM) have been collected in the host galaxies of distant (z≳1.5) AGN. The physical properties of the ISM in galaxies change rapidly with redshift and\, on average\, distant AGN host galaxies are found more compact and denser than their local counterpart. These results suggest that the increased obscuration with redshift might occur on the host galaxy kpc-scale. Observational evidence shows that distant large-scale structures are often composed of gas-rich members\, including the progenitor of the future brightest cluster galaxies. Moreover\, diffuse large reservoirs of cold gas have been detected in the central regions of the intra-cluster medium (ICM) in many proto-clusters. Galaxy clusters are the largest virialized structures in the Universe\, and most of their assembly takes place at the cosmic epoch where both star formation and black hole accretion peak (1< z <3). Exploring the interplay between nuclear activity\, star formation and gas supply in such objects addresses the processes responsible for the build-up of present-day most massive galaxies. The presence of such an extremely dense environment strongly affects the galaxy-SMBH co-evolution through mechanical/radiative feedback processes; in addition\, AGN are known to produce powerful relativistic-particle jets onto scales of several hundreds of kpc\, and increasingly evidence have shown that AGN-feedback can extend on distances far beyond the host galaxy scale. \n\n In this talk I will review the main recent observational results about the ISM content in distant AGN and proto-cluster\, highlight the importance of a multi-wavelength approach and high-resolution observations in determining the ISM/ICM gas reservoir properties such as size\, morphology\, distribution and kinematics. I will discuss the implications of such findings in modelling the evolution of massive galaxies and large-scale structures across cosmic time\, and the role of AGN feedback in regulating such an evolution. In addition\, I will discuss the role of the ISM in obscuring high-z AGN and the incidence of the obscured AGN fraction as a function of the redshift\, presenting multi-wavelength observations and numerical simulations. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-quirino-damato-sissa/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-23112022.jpg
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20221130T150000
DTEND;TZID=Australia/Sydney:20221130T160000
DTSTAMP:20260516T065441
CREATED:20250819T073203Z
LAST-MODIFIED:20250819T073204Z
UID:14957-1669820400-1669824000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Grazia Umana (INAF)
DESCRIPTION:The impact of SKA on Galactic Science: a glimpse at the Galactic plane with SKA precursors\n\nAbstract\n\nAbout 50-70% of the first five years of SKA operations will be devoted to KSPs\, and probably also to Generic Surveys that maximize commensality to a wide range of scientific objectives. There are already several proposed KSPs focused on Galactic Science and we foresee many other KSP concepts being submitted under the breadth of Our Galaxy SWG. SKA\, providing better sensitivity and angular resolution than any of the ongoing/planned surveys of the Galactic plane\, will give the opportunity to create a sensitive wide-field atlas of Galactic radio emission and to address several topics in the field of Galactic radioastronomy. In this talk\, I will summarize the ongoing work aimed at achieving skills and expertise in the run-up to the development of the full SKA to be ready and competitive for leading and participating in a SKA KSP dedicated to Galactic studies\, with particular regard to recent results from the use of SKA precursors. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-grazia-umana-inaf/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-30112022-scaled.jpg
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