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PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-5292
DTSTART:20200130T213000Z
DTEND:20200130T230000Z
DTSTAMP:20260415T041025Z
LAST-MODIFIED:20200115T190841Z
LOCATION:4421 Sterling Hall\, Coffee and cookies 3:30 PM\, Talk begins
  3:45 PM
SUMMARY:Some Interesting issues in Galactic Dynamics\, Astronomy Collo
 quium\, Professor Elena D'onghia\, UW Madison Astronomy Department
DESCRIPTION:The Gaia satellite is currently mapping the phase-space of
  a few million stars in the solar neighborhood showing time-varying ph
 enomena. About 350\,000 stars within 200 pc of the Sun are identified 
 in streams\, bundles of stars that move together in the same direction
  with a velocity that is distinct from neighboring
\nstars. I will pre
 sent a set of N-body simulations of the Milky Way disk that shows the 
 role of a long stellar bar and spiral arms in understanding the comple
 x kinematics of the solar vicinity. Finally\, the passage of Sagittari
 us dwarf galaxy induces rapid time-variations in the potential that le
 ad to a significant bias of the Oort limit through the Jeans modeling.
  This calls for the development of non-equilibrium methods to estimate
  the dynamical matter density locally and in the outer disk.
URL:https://www.physics.wisc.edu/events/?id=5292
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