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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1983
DTSTART:20101104T203000Z
DURATION:PT1H0M0S
DTSTAMP:20260422T204547Z
LAST-MODIFIED:20100929T152343Z
LOCATION:4421 Sterling Hall  Same Location
SUMMARY:Resonant Stripping as the origin of dwarf spheroidal galaxies\
 , Astronomy Colloquium\, Elena D'Onghia\, Harvard CfA
DESCRIPTION:The most dark matter dominated galaxies known are the dwar
 f spheroidals\,but their origin is still uncertain. The recent discove
 ry of ultra-faint dwarf spheroidals around the Milky Way further chall
 enges our understanding of how low-luminosity galaxies originate and e
 volve because of their even more extreme paucity of gas and stars rela
 tive to their dark matter content. By employing numerical simulations 
  I will show that interactions between dwarf disc galaxies can excite 
 a gravitational resonance that immediately drives their evolution into
  spheroidals. This effect\, which is purely gravitational in nature\, 
 applies to gas and stars and is distinct from other mechanisms which h
 ave been<br><br>
\nproposed up to now to explain the origin of dwarf s
 pheroidals\, such as merging\, galaxy-galaxy harassment and more gener
 al heating processes\, or tidal and ram pressure stripping. Using a ne
 w analytic formalism we developed based on the linear perturbation the
 ory I will show the nature and the efficiency of the resonant process 
 and its applicability to the formation of tails of stars and streams o
 f gas.
URL:https://www.physics.wisc.edu/events/?id=1983
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