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DTSTART;TZID=Australia/Sydney:20240207T150000
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DTSTAMP:20260517T052907
CREATED:20250819T061235Z
LAST-MODIFIED:20250819T061235Z
UID:14854-1707318000-1707321600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Hamsa Padmanabhan (University of Geneva)
DESCRIPTION:Deciphering Cosmic Dawn: A Conquest of the Final Frontier\n\nAbstract\n\nI will begin with a broad-based introduction to some of the big open questions in cosmology\, and illustrate how upcoming experiments are well-poised to help answer them\, especially at the Cosmic Dawn — the birth of the first galaxies in our Universe — widely believed to be the ‘final frontier’ of cosmological surveys today. This period — about a hundred million years after the Big Bang — is primarily accessible due to radiation from hydrogen\, the most abundant element in the Universe\, which emits at a wavelength of 21 cm\, in the radio band. An exquisite investigation of the Cosmic Dawn will soon become possible with an emerging technique called intensity mapping (IM)\, which measures the integrated 21 cm emission from all sources\, using large arrays of radio telescopes. A particular advantage of IM is that it provides a tomographic\, or three-dimensional picture of the Universe\, unlocking significantly more information than we presently have from galaxy surveys. I will overview the latest advances in research related to the evolution of hydrogen over 12 billion years of cosmic time\, involving a novel data-driven framework to interpret current and future observations. This allows us to fully utilize our present knowledge of astrophysics in order to develop cosmological forecasts from IM. Apart from offering key insights into the nature of the first galaxies\, this opens up the exciting possibility of testing theories of fundamental physics from the Cosmic Dawn. \n\n \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-hamsa-padmanabhan-university-of-geneva/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-07022024.jpg
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DTSTART;TZID=Australia/Sydney:20240214T150000
DTEND;TZID=Australia/Sydney:20240214T160000
DTSTAMP:20260517T052907
CREATED:20250819T061157Z
LAST-MODIFIED:20250819T061157Z
UID:14855-1707922800-1707926400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Rudrani Chowdhury (University of Hong Kong)
DESCRIPTION:Detecting last light from first stars\n\nAbstract\n\nFirst generation metal-free stars\, referred to as population III (Pop III) stars\, are believed to be the first objects to form out of the pristine gas in the very early Universe. Pop III stars have different structures from the current generation of stars and are important for generating heavy elements and shaping subsequent star formation. However\, it is very challenging to directly detect Pop III stars given their high redshifts and short life-times. In this work\, we propose a novel signature for detecting Pop III stars through their tidal disruption events (TDEs) by massive black holes. We model the emission properties and calculate the expected rates for these unique TDEs in the early Universe at z ~10. We find that Pop III star TDEs have much higher mass fallback rates compared to normal TDEs in the local universe and are therefore rather luminous\, rendering them feasible for detection. They also have very long observed flare evolution timescale\, making it more likely to detect such TDEs during their rising phase. We further demonstrate that a large fraction of the TDE emissions are redshifted to infrared wavelengths and can be detected by the James Webb Space Telescope and the Nancy Grace Roman Space Telescope. Lastly\, the TDE rate sensitively depends on the black hole mass function in the early Universe. We find a promising Pop III star TDE detection rate of up to a few tens per year using the Nancy Grace Roman Space Telescope. \n\n \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-rudrani-chowdhury-university-of-hong-kong/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-14022024.jpg
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DTSTART;TZID=Australia/Sydney:20240228T150000
DTEND;TZID=Australia/Sydney:20240228T160000
DTSTAMP:20260517T052907
CREATED:20250819T061124Z
LAST-MODIFIED:20250819T061124Z
UID:14856-1709132400-1709136000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Stanley Owocki (University of Delaware)
DESCRIPTION:Stellar-wind-fed magnetospheres of magnetic massive stars\n\nAbstract\n\nA sub-population (~9%) of hot (OB) stars exhibit strong (B~100-10\,000 G)\, large-scale (often predominantly dipolar) magnetic fields that channel their stellar wind outflows into circumstellar magnetospheres. For young\, rapidly rotating B-stars that have not yet been spun down by wind-magnetic braking\, wind material can be trapped between the Kepler co-rotation radius (RK) and the Alfven radius (RA)\, forming then a “Centrifugal Magnetosphere” (CM)\, with density set at the critical level for “Centrifugal Breakout” (CBO) against the confining magnetic tension. This talk discusses how such CBO controls both the onset and strength of observed H-alpha emission\, while the energetics of the associated CBO-driven magnetic reconnection match well the observed scalings of a non-thermal\, circularly polarized radio emission from such stars . \n\n \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-stanley-owocki-university-of-delaware/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-28022024.png
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