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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3700
DTSTART:20150415T170000Z
DTEND:20150415T180000Z
DTSTAMP:20260419T142549Z
LAST-MODIFIED:20150409T143753Z
LOCATION:4421 Sterling Hall
SUMMARY:Hubble Clocks the High-Velocity Outflow from the Milky Way's C
 ore\, SPECIAL NOON TALK\, Andrew Fox\, StSci
DESCRIPTION:Like other spiral galaxies\, the Milky Way drives a biconi
 cal nuclear wind. Outflowing gas is visible in enhanced emission in ma
 ny parts of the electromagnetic spectrum\, including Fermi gamma-ray b
 ubbles and radio lobes extending above and below the Galactic Center. 
 We present early results from a 49-orbit Hubble Space Telescope progra
 m to study the kinematics and extent of the nuclear outflow\, using UV
  absorption-line spectroscopy of AGN and halo stars lying close on the
  sky to the Galactic Center. The variation in absorption properties wi
 th Galactic latitude allows us to constrain the physical conditions in
  the outflowing gas. We present the first constraint on the nuclear ou
 tflow velocity (~900-1000 km/s) using kinematic outflow modeling of th
 e absorption components observed in the spectrum of the QSO PDS456\, w
 hich lies behind the base of the Fermi Bubbles near the Galactic Cente
 r (l\,b=10.4\, +11.2 degrees).<br>
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URL:https://www.physics.wisc.edu/events/?id=3700
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