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DTSTART;TZID=Australia/Sydney:20240605T150000
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DTSTAMP:20260515T015341
CREATED:20250819T053804Z
LAST-MODIFIED:20250819T053822Z
UID:14868-1717599600-1717603200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Evgeni Grishin (Monash)
DESCRIPTION:Stellar Death and Compact Object mergers in Galactic nuclei\n\nAbstract\n\nThe dynamical and hydrodynamical evolution of stars and stellar remnants is greatly affected by the dense galactic nuclei (GN) environment. We explore the complex interplay of several physical processes that shape the properties\, rates and environments of nuclear transients and black hole (BH) mergers and gravitational-wave (GW) events: i) We show how stellar dynamics shape the rate and properties of stellar BH and NS dynamical evolution and mergers ii) For active galactic nuclei (AGN)\, we study how the presence of an accretion disc modifies the light curves of exploding supernovae and their relation to other nuclear transients. iii) We examine the gravitational torques in AGN discs that drive BH’s radial migration. We find that thermal diffusion greatly alters the existence and nature of migration traps in AGN discs\, which are believed to be responsible for massive hierarchical GW mergers. We find that GW mergers predominantly occur in low-luminosity AGNs. We use detailed recoil kicks and AGN models to study the efficiency of BH mergers for different generations. iv) If time permits\, we show how exotic axion dark-matter theories could be constrained via pulsar timing of pulsar binaries in galactic cores. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-evgeni-grishin/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-05062024.jpg
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DTSTART;TZID=Australia/Sydney:20240612T150000
DTEND;TZID=Australia/Sydney:20240612T160000
DTSTAMP:20260515T015341
CREATED:20250819T053726Z
LAST-MODIFIED:20250819T053727Z
UID:14869-1718204400-1718208000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Susmita Sett (Curtin)
DESCRIPTION:Imaging pulsar census of the Galactic Plane using MWA VCS data\n\nAbstract\n\nPulsars play a crucial role in exploring a wide range of physics and astrophysics\, such as probing dense-matter physics and testing strong-field gravity. Traditional pulsar surveys have mostly used time-domain periodicity searches\, but these methods can be hindered by scattering\, eclipses\, and orbital motion\, especially at low radio frequencies (<300 MHz). In contrast\, image domain searches for pulsars are more effective against these effects\, enabling new discoveries in the parameter space unreachable by traditional methods. To exploit the capability of image-based pulsar searches\, a pipeline has been developed to form 1-second full Stokes images from high-time-resolution data (Voltage Capture System\, VCS) from the Murchison Widefield Array (MWA). This led to the exploration of image-based techniques for identifying new pulsar candidates. In this talk\, I will describe a low-frequency image-based pulsar census of the Galactic Plane (GP) with the MWA focused on detecting the known pulsars in the observed region of the sky using both image-based and beamformed methods. This effort led to our detection of known pulsars\, with some being detected for the first time at low-frequency (150 MHz). The continuum flux densities of the pulsars detected in our image-based GP survey are significantly more reliable than the timing flux densities and therefore offer an additional benefit as flux densities are not readily available or are unreliable for many known pulsars at low frequencies. Therefore\, imaging is an effective approach for discovering new pulsars in less-explored regions of the DM space and improving the spectral modelling of the known detected pulsars. Upcoming facilities like SKA-Low will enhance the success of such image-based pulsar searches and aid in identifying new pulsar candidates. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-susmita-sett-curtin/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-12062024.jpg
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DTSTART;TZID=Australia/Sydney:20240626T150000
DTEND;TZID=Australia/Sydney:20240626T160000
DTSTAMP:20260515T015341
CREATED:20250819T053632Z
LAST-MODIFIED:20250819T053633Z
UID:14870-1719414000-1719417600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Benjamin Roberts (University of Queensland)
DESCRIPTION:A brief history of time(keeping): atomic clocks at the precision frontier of fundamental physics\n\nAbstract\n\nAtomic clocks are the most precise instrucments ever constructed. The best atomic clocks today have a precision that corresponds to losing no more than a second over the lifetime of the universe. In this talk\, I’ll discuss the role of atomic clocks at the forefront of fundamental physics\, with a particular focus on dark matter\, and how precision atomic physics allows us to extend the search for dark matter (and other exotic physics) to lower and lower masses. (Image credit: N. Hanacek\, NIST) \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-benjamin-roberts-university-of-queensland/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-26062024-scaled.jpg
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