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New emerging results on molecular gas, stars, and dust at z ~ 2, as revealed by low star formation rate and low stellar mass star-forming galaxies

Published online by Cambridge University Press:  17 August 2016

Miroslava Dessauges-Zavadsky ,
Michel Zamojski ,
Daniel Schaerer ,
Françoise Combes ,
Eiichi Egami ,
Panos Sklias ,
Mark A. Swinbank ,
Johan Richard  and
Tim Rawle
Miroslava Dessauges-Zavadsky
Affiliation:
Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290 Versoix, Switzerland
Michel Zamojski
Affiliation:
Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290 Versoix, Switzerland
Daniel Schaerer
Affiliation:
Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290 Versoix, Switzerland
Françoise Combes
Affiliation:
Observatoire de Paris, LERMA, 61 Avenue de l'Observatoire, 75014 Paris, France
Eiichi Egami
Affiliation:
Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, United States
Panos Sklias
Affiliation:
Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290 Versoix, Switzerland
Mark A. Swinbank
Affiliation:
Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE, United Kingdom
Johan Richard
Affiliation:
CRAL, Observatoire de Lyon, Université Lyon 1, 9 Avenue Ch. André, 69561 Saint Genis Laval Cedex, France
Tim Rawle
Affiliation:
ESAC, ESA, PO Box 78, Villanueva de la Canada, 28691 Madrid, Spain
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Abstract

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Recent CO surveys of star-forming galaxies (SFGs) at z ~ 2 have revolutionized our picture of massive galaxies. It is time to expand these studies toward the more common z ~ 2 SFGs with SFR < 40 M⊙ yr−1 and M* < 2.5 × 1010 M⊙. We have derived molecular gas, stars, and dust in 8 such lensed SFGs. They extend the LIR–L'CO(1-0) distribution of massive z>1 SFGs and increase the spread of the SFG star formation efficiency (SFE). A single star formation relation is found when combining all existing CO-detected galaxies. Our low-M* SFGs also reveal a SFE decrease with M* as found locally. A rise of the molecular gas fraction (fgas) with redshift is observed up to z ~ 1.6, but it severely flattens toward higher redshifts. We provide the first insight into the fgas upturn at the low-M* end 109.4 < M*/M⊙ < 1010 reaching fgas ~ 0.7, it is followed by a fgas decrease toward higher M*. Finally, we find a non-universal dust-to-gas ratio among local and high-redshift SFGs and starbursts with near-solar metallicities.

Keywords

Gravitational lensinggalaxies: evolutiongalaxies: high-redshift
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S319: Galaxies at High Redshift and Their Evolution Over Cosmic Time , August 2015 , pp. 88 - 91
Copyright
Copyright © International Astronomical Union 2016 

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