COMBES, F.; GARCIA-BURILLO, S.; BRAINE, J.; SCHINNERER, E.; WALTER, F.; COLINA, L.

doi:10.1051/0004-6361/201220392

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COMBES, F.
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]

GARCIA-BURILLO, S.
Observatorio Astronomico Nacional, Madrid

BRAINE, J.
FORMATION STELLAIRE 2013

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Astronomy and Astrophysics - A&A. 2013, vol. 550, p. id.A41

EDP Sciences

Résumé en anglais

After new observations of 39 galaxies at z = 0.6-1.0 obtained at the IRAM 30m telescope, we present our full CO line survey covering the redshift range 0.2 < z < 1. Our aim is to determine the driving factors accounting for the steep decline in the star formation rate during this epoch. We study both the gas fraction, defined as Mgas/(Mgas+Mstar), and the star formation efficiency (SFE) defined by the ratio between far-infrared luminosity and molecular gas mass (LFIR/M(H2), i.e. a measure for the inverse of the gas depletion time. The sources are selected to be ultra-luminous infrared galaxies (ULIRGs), with LFIR greater than 10^12 Lo and experiencing starbursts. When we adopt a standard ULIRG CO-to-H2 conversion factor, their molecular gas depletion time is less than 100 Myr. Our full survey has now filled the gap of CO observations in the 0.2< Réduire

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radio lines: galaxies

galaxies: starburst

galaxies: high-redshift

galaxies: ISM

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Gas fraction and star formation efficiency at z < 1.0

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