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UID:UW-Physics-Event-3931
DTSTART:20160211T213000Z
DTEND:20160211T230000Z
DTSTAMP:20260502T101849Z
LAST-MODIFIED:20160121T151611Z
LOCATION:4421 Sterling Hall\, Coffee and Cookies at 3:15 PM
SUMMARY:Gas dynamics and star formation in dwarf galaxies\, Astronomy 
 Colloquium\, Dr. Federico Lelli\, Case Western Reserve University
DESCRIPTION:Dwarf galaxies are the most common types of galaxies in th
 e Universe. They play a key role in understanding the process of star 
 formation and the effect of stellar feedback on galaxy evolution. I wi
 ll present recent results from interferometric HI observations\, focus
 ing on two key types of low-mass galaxies: starburst dwarfs and tidal 
 dwarfs.<br>
\n<br>
\nStarburst dwarfs in the nearby Universe represent
  our best analogues to high-z star-forming galaxies. We find that the 
 inner rotation curves of starburst dwarfs rise more steeply than those
  of typical dwarf irregulars\, pointing to a close link between intens
 e star formation and galaxy dynamics (distribution of baryons and dark
  matter).<br>
\n<br>
\nTidal dwarf galaxies (TDGs) are recycled object
 s that form within the tidal debris around interacting and merging gal
 axies. TDGs may represent a new\, unexplored channel for the formation
  of dwarf galaxies. We find that putative TDGs are associated with rot
 ating gas disks and seem to be nearly devoid of dark matter\, as predi
 cted by numerical simulations in a LCDM context. I will discuss the im
 plications of these results for the formation and evolution of dwarf g
 alaxies.
URL:https://www.physics.wisc.edu/events/?id=3931
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