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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
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

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 L IRL'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 (f gas) with redshift is observed up to z ~ 1.6, but it severely flattens toward higher redshifts. We provide the first insight into the f gas upturn at the low-M * end 109.4 < M */M < 1010 reaching f gas ~ 0.7, it is followed by a f gas 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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2016 

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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
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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
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