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1 results

  • Molecular gas content in typical L* galaxies at z ∼ 1.5 − 3

  • Miroslava Dessauges-Zavadsky, Michel Zamojski, Daniel Schaerer, Françoise Combes, Eiichi Egami, A. Mark Swinbank, Johan Richard, Panos Sklias, Tim D. Rawle, Jean-Paul Kneib, Frédéric Boone, Andrew Blain
  • Journal:
    Proceedings of the International Astronomical Union / Volume 10 / Issue S309 / July 2014
    Published online by Cambridge University Press:
    09 February 2015, pp. 285-286
    Print publication:
    July 2014
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  • 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.