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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20151015T103000
DTEND;TZID=Atlantic/Canary:20151015T113000
UID:iactalks-837
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/837
CREATED:2015-10-15T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Localized starbursts in dwarf galaxies produced by impact of low me
 tallicity cosmic gas clouds
DESCRIPTION:Localized starbursts in dwarf galaxies produced by impact of lo
 w metallicity cosmic gas clouds\nDr. Jorge Sanchez Almeida\n\nModels of ga
 laxy formation predict that gas accretion from the cosmic web is a primary
  driver of star formation over cosmic history. Except in very dense enviro
 nments where galaxy mergers are also important, model galaxies feed from c
 old streams of gas from the web that penetrate their dark matter haloes. A
 lthough these predictions are unambiguous, the observational support has b
 een indirect so far. I will report spectroscopic evidence for this process
  in extremely metal-poor galaxies (XMPs) of the local Universe, taking the
  form of localized starbursts associated with gas having low metallicity. 
 Because gas mixes azimuthally in a rotation timescale (a few hundred Myr),
   the observed metallicity inhomogeneities are only possible if the m
 etal-poor gas producing stars fell onto the disk recently. I will analyze 
 several possibilities for the origin of the metal-poor gas, favoring the m
 etal-poor gas infall predicted by numerical models. In addition, I will sh
 ow model galaxies in cosmological numerical simulations with starbursts of
  low metallicity like to the star-forming regions in XMPs.
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