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SUMMARY:Molecular gas and star formation across the Hubble time - Francois
 e Combes (l’Observatoire de Paris)
DTSTART:20140225T163000Z
DTEND:20140225T173000Z
UID:TALK49807@talks.cam.ac.uk
CONTACT:David Titterington
DESCRIPTION:The cosmic star formation rate reveals a pronounced peak 10 Gy
 rs ago (or z=1-2) and then slows down\, dropping by more than a factor 10 
 since z=1.  This behaviour might be the result of combined physical proces
 ses\, like hierarchical merging of galaxies\, gas accretion\, formation of
  molecular clouds and stars\, metal enriched gas outflows that are driven 
 by stellar winds\, supernovae and AGN activity.  I will review some IRAM r
 ecent results about the molecular content of galaxies and its dynamics\, o
 btained from CO lines.  The star formation efficiency increases with redsh
 ift\, as shown by the Kennicutt-Schmidt law\, and the derived depletion ti
 me.  In massive galaxies\, the gas fraction was higher in the past\, and g
 alaxy disks were more unstable and more turbulent.  Preliminary results wi
 ll be shown with ALMA\, which will in the future allow the study of main s
 equence galaxies at high z with higher spatial resolution and sensitivity.
 \n
LOCATION:Sackler Lecture Theatre\, Institute of Astronomy
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