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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-3784
DTSTART:20150917T204500Z
DTEND:20150917T100000Z
DTSTAMP:20260419T110402Z
LAST-MODIFIED:20150828T161043Z
LOCATION:4421 Sterling Hall
SUMMARY:Cosmic Accretion and Star formation in Dwarf Galaxies \, Astro
 nomy Colloquium\, Bruce Elmegreen\, IBM  T.J. Watson Research Center
DESCRIPTION:Star formation in dwarf galaxies is anomalous for many rea
 sons: Blue Compact Dwarfs have enormous bursts relative to their size 
 but no evident mergers\, dwarf Irregulars have rates per unit area tha
 t get as low as 0.1% of that in the solar neighborhood while preservin
 g nearly perfect exponential profiles\, and most galaxies with less th
 an 10% solar metallicity have cometary shapes suggesting ram pressure 
 or other lopsided disturbances. Dwarf irregulars also have hardly any 
 CO emission yet can have specific star formation rates higher than the
  Milky Way. Here I discuss these anomalies and our recent observations
  to help understand<br>
\nthem. These observations include the relatio
 nship between star formation rate and gas surface density in 20 local 
 dwarf Irregulars\, which are gas dominated\, thick\, and very stable a
 ccording to the Toomre condition\, evidence for cosmic accretion in th
 e form of locally low metallicities in the starburst regions of extrem
 ely metal poor galaxies\, and two-sided accretion at a rate sufficient
  to sustain star formation in the local dwarf starburst IC 10. I also 
 discuss CO observations with ALMA of the lowest metallicity molecular 
 clouds in the local dwarf irregular WLM. 
URL:https://www.physics.wisc.edu/events/?id=3784
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