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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20140529T103000
DTEND;TZID=Atlantic/Canary:20140529T113000
UID:iactalks-644
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/644
CREATED:2014-05-29T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Star formation sustained by gas accretion at all redshifts 
DESCRIPTION:Star formation sustained by gas accretion at all redshifts \nDr
 . Jorge Sanchez Almeida\n\nThis paper discusses how cosmic gas accretion c
 ontrols star formation, and summarizes the physical properties expected fo
 r the cosmic gas accreted by galaxies. The paper also collects observation
 al evidence for gas accretion sustaining star formation. It reviews eviden
 ce inferred from neutral and ionized hydrogen, as well as from stars. A nu
 mber of  properties characterizing large samples of star-forming galaxies 
 can be explained by metal-poor gas accretion, in particular, the relations
 hip between stellar mass, metallicity, and star formation rate (the so-cal
 led fundamental metallicity relationship). They are put forward and analyz
 ed. Theory predicts gas accretion to be particularly important at high red
 shift, so indications based on distant objects are reviewed, including the
  global star formation history of the universe, and the gas around galaxie
 s as inferred from absorption features in the spectra of background source
 s.
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