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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3923
DTSTART:20160401T203000Z
DTEND:20160401T213000Z
DTSTAMP:20260419T094350Z
LAST-MODIFIED:20160325T160921Z
LOCATION:2241 Chamberlin Hall
SUMMARY:New Satellite Galaxies of Our Milky Way\, Physics Department C
 olloquium\, Keith Bechtol\, UW - Madison\, Wisconsin IceCube Particle 
 Astrophysics Center
DESCRIPTION:The population of satellite galaxies orbiting the Milky Wa
 y includes the most ancient\, most chemically pristine\, and most dark
  matter dominated galaxies in the known universe. These objects have r
 eshaped how we define a “galaxy” and provide a unique testing grou
 nd both for galaxy formation models and the cold dark matter paradigm.
  The current census of roughly thirty galaxies surrounding the Milky W
 ay is almost certainly incomplete. Ongoing and near-future wide-field 
 optical imaging surveys are anticipated to find hundreds of ultra-fain
 t Milky Way companions at lower luminosities\, greater distances\, and
  in less explored regions of the sky. Over twenty new low-luminosity s
 tellar systems were discovered in 2015\, and several of these have now
  been dynamically and/or chemically confirmed as galaxies. I will plac
 e these recent results in context and consider what the emergent popul
 ation of Milky Way satellites can teach us about the first stars and g
 alaxies\, as well as the particle nature of dark matter. Finally\, I w
 ill discuss the exciting prospects for near-field cosmology in the com
 ing decade.
URL:https://www.physics.wisc.edu/events/?id=3923
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