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DTSTART;TZID=America/Chicago:20191206T153000
DTEND;TZID=America/Chicago:20191206T163000
DTSTAMP:20191127T171451Z
CREATED:20190827T143041Z
LAST-MODIFIED:20191127T171451Z
UID:10384500-1575646200-1575649800@uwm.edu
SUMMARY:Physics Colloquium - Chuck Steidel
DESCRIPTION:Chuck Steidel\, Caltech \nImaging the “Baryon Cycle” of Forming Galaxies \nThe rapid increase in the universal star formation density between z~6 and z~2 (12.5-10.5 Gyr ago) was driven by high rates of accretion onto galaxy-scale dark matter halos\, but was simultaneously modulated by energetic feedback from massive stars\, supernovae\, and AGN activity whose large-scale effects remain uncertain.  The competition between rapid accretion from the intergalactic medium and outflows driven by sources of energy and momentum originating near a galaxy’s center is arguably the least well-understood aspect of the current galaxy formation paradigm. But the “battleground” for the competition is the so-called “circumgalactic medium” (CGM)\, a large (200-300 kpc) reservoir of diffuse\, multi-phase gas whose temperature\, density\, metal content\, and kinematics are uniquely sensitive to accreting or outflowing baryons on scales beyond that of the central galaxy.  \nAfter an overview of our current understanding of the CGM surrounding high redshift galaxies\, I will present new observations (and some preliminary interpretation) using extremely deep imaging spectroscopy with the recently-commissioned “Keck Cosmic Web Imager” (KCWI).  KCWI provides continuous\, spatially-resolved maps — with unprecedented sensitivity – of diagnostic emission and absorption lines on transverse scales of 1->200 Kpc arising from circumgalactic gas around forming galaxies at z~2-3. \nEvent flyer available here
URL:https://uwm.edu/physics/event/physics-colloquium-to-be-announced-2019-12-06/
LOCATION:Lapham 160\, 3209 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:Physics Colloquia
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