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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20120621T000000
DTEND;TZID=Atlantic/Canary:20120621T010000
UID:iactalks-385
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/385
CREATED:2012-06-21T00:00:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Molecular gas in galaxies, and evolution with redshift
DESCRIPTION:Molecular gas in galaxies, and evolution with redshift\nProf. F
 rançoise Combes\n\nI will review some recent results about the molecular 
 content of galaxies and its dynamics, obtained from CO lines, dense tracer
 s (HCN,HCO+), or the dust continuum emission. New data to constrain the co
 nversion factor XCO will be discussed. The molecular surface density is es
 sential to determine the star formation efficiency in galaxies, and the re
 solved Kennicutt-Schmidt law will be presented as a function of surface de
 nsity and galaxy type. Large progress has been made on galaxy at moderate 
 and high redshifts, allowing to interprete the star formation history and 
 star formation efficiency as a function of gas content, or galaxy evolutio
 n. In massive galaxies, the gas fraction was higher in the past, and galax
 y disks were more unstable and more turbulent. ALMA observations will allo
 w the study of more normal galaxies at high z with higher spatial resoluti
 on and sensitivity.
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