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

doi:10.1017/S1743921314009880

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

Steward Observatory

Research output: Contribution to journal › Article › peer-review

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 10^9.4 < M ∗ /M⊙< 10^9.9, which shows a clear fgas upturn.

Original language	English (US)
Pages (from-to)	285-286
Number of pages	2
Journal	Proceedings of the International Astronomical Union
Volume	10
DOIs	https://doi.org/10.1017/S1743921314009880
State	Published - 2014

Keywords

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

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1017/S1743921314009880

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@article{866db82188d5426eb8e10808d685b829,

title = "Molecular gas content in typical L∗ galaxies at z ∼ 1.5 - 3",

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.",

keywords = "Galaxies: high-redshift, Gravitational lensing: strong, ISM: molecules",

author = "Miroslava Dessauges-Zavadsky and Michel Zamojski and Daniel Schaerer and Franc¸oise Combes and Eiichi Egami and Swinbank, {A. Mark} and Johan Richard and Panos Sklias and Rawle, {Tim D.} and Kneib, {Jean Paul} and Fr{\'e}d{\'e}ric Boone and Andrew Blain",

note = "Publisher Copyright: {\textcopyright} International Astronomical Union 2015.",

year = "2014",

doi = "10.1017/S1743921314009880",

language = "English (US)",

volume = "10",

pages = "285--286",

journal = "Proceedings of the International Astronomical Union",

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publisher = "Cambridge University Press",

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TY - JOUR

T1 - Molecular gas content in typical L∗ galaxies at z ∼ 1.5 - 3

AU - Dessauges-Zavadsky, Miroslava

AU - Zamojski, Michel

AU - Schaerer, Daniel

AU - Combes, Franc¸oise

AU - Egami, Eiichi

AU - Swinbank, A. Mark

AU - Richard, Johan

AU - Sklias, Panos

AU - Rawle, Tim D.

AU - Kneib, Jean Paul

AU - Boone, Frédéric

AU - Blain, Andrew

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

KW - Galaxies: high-redshift

KW - Gravitational lensing: strong

KW - ISM: molecules

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U2 - 10.1017/S1743921314009880

DO - 10.1017/S1743921314009880

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SN - 1743-9213

VL - 10

SP - 285

EP - 286

JO - Proceedings of the International Astronomical Union

JF - Proceedings of the International Astronomical Union

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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