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DTSTART;TZID=Europe/Paris:20251008T110000
DTEND;TZID=Europe/Paris:20251008T120000
DTSTAMP:20260514T050947
CREATED:20250915T083255Z
LAST-MODIFIED:20251001T090705Z
UID:8126-1759921200-1759924800@cral.osu-lyon.fr
SUMMARY:CRAL@Obs Seminar - Jenny Wagner (Helsinki Institute of Physics)
DESCRIPTION:Title: From cosmic lasagna to space-time spaghetti — obtaining the least-model-dependent strong gravitational lensing probe \n \nAbstract: Strong gravitational lensing has advanced as a standard probe to map mass densities of cosmic structures or to try and infer parameters of the cosmological concordance model\, like the Hubble Constant.\nIn this talk\, I will introduce those properties of a light-deflecting cosmic structure that can be uniquely and directly determined from observables without any lens model assumptions. These properties constitute the maximum information common to all model-based mass maps and require less than a second of computing time [1]. The derivation of these characteristics also reveals the most general class of lensing degeneracies and a simple physical interpretation of their origins [2]. \nI will showcase the power of this approach in two galaxy clusters: we can infer a least-model-dependent smoothness scale for dark matter\, reconstruct the morphology of the lensed source galaxy\, and even infer global properties of the lensing cluster in combination with complementary data [3\,4]. Thus\, with an increasing amount of data\, this approach will allow us to gain a deeper understanding of the _necessary_ amount and properties of dark matter in cosmic structures. \nReferences:\n[1] https://arxiv.org/abs/1906.05285\n[2] https://arxiv.org/abs/1809.03505\, https://arxiv.org/abs/1904.07239\, https://arxiv.org/abs/2203.06190\n[3] https://arxiv.org/abs/2105.04562\, https://arxiv.org/abs/2207.01630\n[4] https://arxiv.org/abs/2306.11779
URL:https://cral.osu-lyon.fr/event/cralobs-seminar-jenny-wagner-tbc/
LOCATION:Observatoire
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DTSTART;TZID=Europe/Paris:20251010T110000
DTEND;TZID=Europe/Paris:20251010T120000
DTSTAMP:20260514T050947
CREATED:20250915T083413Z
LAST-MODIFIED:20250917T123051Z
UID:8128-1760094000-1760097600@cral.osu-lyon.fr
SUMMARY:CRAL@ENS Seminar - Henrik Beuther (MPIA Heidelberg)
DESCRIPTION:
URL:https://cral.osu-lyon.fr/event/cralens-seminar-henrik-beuther-mpia-heidelberg/
LOCATION:ENS
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251017T110000
DTEND;TZID=Europe/Paris:20251017T120000
DTSTAMP:20260514T050947
CREATED:20250915T083614Z
LAST-MODIFIED:20250915T083614Z
UID:8130-1760698800-1760702400@cral.osu-lyon.fr
SUMMARY:CRAL@Obs Seminar - Sophia Stacevic (LIRA\, Paris)
DESCRIPTION:
URL:https://cral.osu-lyon.fr/event/cralobs-seminar-sophia-stacevic-lira-paris/
LOCATION:Observatoire
ATTACH;FMTTYPE=image/png:https://cral.osu-lyon.fr/wp-content/uploads/2023/11/image_defaut.png
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251024T110000
DTEND;TZID=Europe/Paris:20251024T120000
DTSTAMP:20260514T050947
CREATED:20251022T103216Z
LAST-MODIFIED:20251022T103216Z
UID:8231-1761303600-1761307200@cral.osu-lyon.fr
SUMMARY:CRAL@Obs Seminar – Seok-Jun Chang (MPIA)
DESCRIPTION:Title: Probing Cold Gas around Galaxies through the Mg II Resonance Doublet \nAbstract: The structure and kinematics of the gas around and in galaxies are crucial for understanding the multiphase flows within the galactic ecosystem and\, thus\, galaxy evolution and star formation. Recent advancements in instruments and techniques offer a new perspective on circumgalactic gas flows through emission lines such as Hydrogen Lyman-α and resonance lines of metals (e.g.\, Mg II\, C IV\, O VI\, and N V). In particular\, the Mg II λλ2796\, 2803 doublet has emerged as a promising tracer of cold gas at T ~ 10^4 K. To decode the message carried by the Mg II doublet emission\, we developed a 3D Monte-Carlo radiative transfer code ‘RT-scat’. In this talk\, I will present simulated results from ‘RT-scat’\, demonstrating how Mg II lines form in various environments\, including inflowing/outflowing\, smooth/clumpy\, and dusty gas. In particular\, I will also highlight how the MgII doublet line ratio can serve as a potential indicator of LyC escape. Furthermore\, I will introduce our new radiative transfer modeling of Mg II emission halos around star-forming galaxies at z ~ 1 from the MAGG and MUDF survey. Our results indicate the presence of slowly moving or outflowing cold gas and reveal strong anisotropies in its distribution. If time allows\, I will also discuss other metal resonance lines as tracers of multiphase gas.
URL:https://cral.osu-lyon.fr/event/cralobs-seminar-seok-jun-chang-mpia/
LOCATION:Observatoire
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