Molecular gas content in typical L∗ galaxies at z ∼ 1.5 - 3

Miroslava Dessauges-Zavadsky, Michel Zamojski, Daniel Schaerer, Franc¸oise Combes, Eiichi Egami, A. Mark Swinbank, Johan Richard, Panos Sklias, Tim D. Rawle, Jean Paul Kneib, Frédéric Boone, Andrew Blain

Research output: Contribution to journalArticlepeer-review


To extend the molecular gas measurements to typical L∗ star-forming galaxies (SFGs) at z ∼ 1.5 - 3, we have observed CO emission for five strongly-lensed galaxies selected from the Herschel Lensing Survey. The combined sample of our L∗ SFGs with CO-detected SFGs at z > 1 from the literature shows a large spread in star formation efficiency (SFE). We find that this spread in SFE is due to variations of several physical parameters, primarily the specific star formation rate, but also stellar mass and redshift. An increase of the molecular gas fraction ( fgas ) is observed from z ∼ 0.2 to z ∼ 1.2, followed by a quasi non-evolution toward higher redshifts, as found in earlier studies. We provide the first measure of fgas of z > 1 SFGs at the low-stellar mass end between 109.4 < M ∗ /M⊙< 109.9, which shows a clear fgas upturn.

Original languageEnglish (US)
Pages (from-to)285-286
Number of pages2
JournalProceedings of the International Astronomical Union
StatePublished - 2014


  • Galaxies: high-redshift
  • Gravitational lensing: strong
  • ISM: molecules

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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