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The Molecular Gas Content of Z = 3 Lyman Break Galaxies: Evidence of a Non-Evolving Gas Fraction in Main-Sequence Galaxies At Z > 2

Abstract : We present observations of the CO[J = 3 → 2] emission toward two massive and infrared luminous Lyman break galaxies (LBGs) at z = 3.21 and z = 2.92, using the IRAM Plateau de Bure Interferometer, placing first constraints on the molecular gas masses (M gas) of non-lensed LBGs. Their overall properties are consistent with those of typical (main-sequence) galaxies at their redshifts, with specific star formation rates ~1.6 and ~2.2 Gyr-1, despite their large infrared luminosities (L IR (2-3) × 1012 L ☉) derived from Herschel. With one plausible CO detection (spurious detection probability of 10-3) and one upper limit, we investigate the evolution of the molecular gas-to-stellar mass ratio (M gas/M *) with redshift. Our data suggest that the steep evolution of M gas/M * of normal galaxies up to z ~ 2 is followed by a flattening at higher redshifts, providing supporting evidence for the existence of a plateau in the evolution of the specific star formation rate at z > 2.5.
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https://hal-cea.archives-ouvertes.fr/cea-00832914
Contributor : Bruno Savelli <>
Submitted on : Tuesday, June 11, 2013 - 3:42:53 PM
Last modification on : Thursday, October 15, 2020 - 3:40:03 PM

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G. E. Magdis, Emanuele Daddi, M. Sargent, D. Elbaz, R. Gobat, et al.. The Molecular Gas Content of Z = 3 Lyman Break Galaxies: Evidence of a Non-Evolving Gas Fraction in Main-Sequence Galaxies At Z > 2 . Astrophysical Journal Letters, IOP Science, 2012, 758 (1), pp.L9. ⟨10.1088/2041-8205/758/1/L9⟩. ⟨cea-00832914⟩

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