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DTSTART;TZID=Europe/Paris:20250418T110000
DTEND;TZID=Europe/Paris:20250418T120000
DTSTAMP:20260513T214430
CREATED:20250124T171855Z
LAST-MODIFIED:20250124T171855Z
UID:7722-1744974000-1744977600@cral.osu-lyon.fr
SUMMARY:CRAL@ENS Seminar by Philipp Girichidis (Universität Heidelberg)
DESCRIPTION:TBD
URL:https://cral.osu-lyon.fr/en/event/cralens-seminar-by-philipp-girichidis-universitat-heidelberg/
LOCATION:ENS
ATTACH;FMTTYPE=image/png:https://cral.osu-lyon.fr/wp-content/uploads/2023/11/image_defaut.png
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DTSTART;TZID=Europe/Paris:20260313T110000
DTEND;TZID=Europe/Paris:20260313T120000
DTSTAMP:20260513T214430
CREATED:20251216T101717Z
LAST-MODIFIED:20251216T101717Z
UID:8509-1773399600-1773403200@cral.osu-lyon.fr
SUMMARY:CRAL@Obs Seminar by Chris Byrohl (KIPAC\, Stanford University)
DESCRIPTION:Title: Emission Tomography of the Cosmic Web at Cosmic Noon\nAbstract:Deep integral-field and narrowband surveys now detect faint\, extended Lyman-alpha (Lyα) emission from the circumgalactic medium and\, increasingly\, from diffuse gas in cosmic filaments. I will review recent measurements and their interpretation\, highlighting how galaxy and gas physics\, as well as radiative transfer\, complicate the mapping from surface brightness to gas density and kinematics. I will then discuss how modern galaxy formation simulations\, coupled to Lyα radiative transfer calculations\, are being used to build forward models for large-volume surveys. Finally\, I will present first steps toward physics-informed emission tomography: inference and reconstruction methods that connect simulations and observations of the gas and galaxy distribution\, enabled by differentiable simulators.
URL:https://cral.osu-lyon.fr/en/event/cralobs-seminar-by-chris-byrohl-kipac-stanford-university/
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DTSTART;TZID=Europe/Paris:20260522T110000
DTEND;TZID=Europe/Paris:20260522T120000
DTSTAMP:20260513T214430
CREATED:20260513T141030Z
LAST-MODIFIED:20260513T141030Z
UID:8715-1779447600-1779451200@cral.osu-lyon.fr
SUMMARY:CRAL@Obs Seminar by Sarah Bosman (University of Heidelberg)
DESCRIPTION:Title: Distant Quasars: The Observational Key to the Formation of Structure Across Scales \nAbstract: The most distant luminous quasars\, now found up to redshifts z~7.5\, are in many ways the most robust tools used by astronomers to study the first billion years of our Universe.\nOn the gigaparsec scales of the cosmic web\, the Lyman-alpha forest in front of the first quasars gives us the most precise measurement of reionisation’s end at z=5.3. Soon\, advances in ground-based instrumentation will also yield an accurate value for the process’ mid-point\, a crucial boundary condition on Cosmic Dawn.\nOn galactic scales\, quasar spectra capture metal absorbers from the circum-galactic medium of faint early galaxies which cannot be detected in emission. Using this approach\, I will present recent record-breaking observations of the most metal-poor galaxy detected to date: 11\,000 times more metal-poor than the Sun\, it is the first “ultra” metal-poor galaxy\, and gives a fascinating glimpse of the properties of the first metal-poor stars.\nFinally\, the existence of quasars at z>7 is a tremendous mystery in itself: the supermassive black holes powering them cannot easily grow from the remnants of the first stars. I will present cutting-edge observations from JWST which help elucidate this mystery.
URL:https://cral.osu-lyon.fr/en/event/cralobs-seminar-by-sarah-bosman-university-of-heidelberg/
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