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

Published online by Cambridge University Press:  09 February 2015


Miroslava Dessauges-Zavadsky
Affiliation:
Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Versoix, Switzerland email: miroslava.dessauges@unige.ch
Michel Zamojski
Affiliation:
Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Versoix, Switzerland email: miroslava.dessauges@unige.ch
Daniel Schaerer
Affiliation:
Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Versoix, Switzerland email: miroslava.dessauges@unige.ch
Françoise Combes
Affiliation:
Observatoire de Paris, LERMA, 61 Avenue de l'Observatoire, 75014Paris, France
Eiichi Egami
Affiliation:
Steward Observatory, University of Arizona933 North Cherry Avenue, Tucson, AZ85721, USA
A. Mark Swinbank
Affiliation:
Institute for Computational Cosmology, Durham University, South Road, DurhamDH1 3LE, UK
Johan Richard
Affiliation:
CRAL, Observatoire de Lyon, Université Lyon 1, 9 Avenue Ch. André, 69561 Saint Genis Laval Cedex, France
Panos Sklias
Affiliation:
Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Versoix, Switzerland email: miroslava.dessauges@unige.ch
Tim D. Rawle
Affiliation:
ESAC, ESA, PO Box 78, Villanueva de la Canada, 28691Madrid, Spain
Jean-Paul Kneib
Affiliation:
Laboratoire d'Astrophysique, Ecole Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, 1290 Versoix, Switzerland
Frédéric Boone
Affiliation:
CNRS, IRAP, 14 Avenue E. Belin, 31400Toulouse, France
Andrew Blain
Affiliation:
Department of Physics & Astronomy, University of Leicester, University Road, LeicesterLE1 7RH, UK
Corresponding

Abstract

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.


Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2015 

References

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