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    Molecular Gas Contents and Scaling Relations for Massive, Passive Galaxies at Intermediate Redshifts from the LEGA-C Survey

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    Spilker_2018_ApJ_860_103.pdf
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    Author
    Spilker, Justin
    Bezanson, Rachel
    Barišić, Ivana
    Bell, Eric
    P. Lagos, Claudia del
    Maseda, Michael
    Muzzin, Adam
    Pacifici, Camilla
    Sobral, David
    Straatman, Caroline
    Wel, Arjen van der
    Dokkum, Pieter van
    Weiner, Benjamin cc
    Whitaker, Katherine
    Williams, Christina C. cc
    Wu, Po-Feng
    Show allShow less
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2018-06-20
    Keywords
    galaxies: evolution
    galaxies: high-redshift
    galaxies: ISM
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Justin Spilker et al 2018 ApJ 860 103
    Journal
    ASTROPHYSICAL JOURNAL
    Rights
    © 2018. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    A decade of study has established that the molecular gas properties of star-forming galaxies follow coherent scaling relations out to z similar to 3, suggesting remarkable regularity of the interplay between molecular gas, star formation, and stellar growth. Passive galaxies, however, are expected to be gas-poor and therefore faint, and thus little is known about molecular gas in passive galaxies beyond the local universe. Here we present deep Atacama Large Millimeter/submillimeter Array observations of CO(2-1) emission in eight massive (M-star similar to 10(11 )M(circle dot)) galaxies at z similar to 0.7 selected to lie a factor of 3-10 below the star-forming sequence at this redshift, drawn from the Large Early Galaxy Astrophysics Census survey. We significantly detect half the sample, finding molecular gas fractions less than or similar to 0.1. We show that the molecular and stellar rotational axes are broadly consistent, arguing that the molecular gas was not accreted after the galaxies became quiescent. We find that scaling relations extrapolated from the star-forming population overpredict both the gas fraction and gas depletion time for passive objects, suggesting the existence of either a break or large increase in scatter in these relations at low specific star formation rate. Finally, we show that the gas fractions of the passive galaxies we have observed at intermediate redshifts are naturally consistent with evolution into local, massive early-type galaxies by continued low-level star formation, with no need for further gas accretion or dynamical stabilization of the gas reservoirs in the intervening 6 billion years.
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/aac438
    Version
    Final published version
    Sponsors
    McDonald Observatory at the University of Texas at Austin through a Harlan J. Smith Fellowship; Discovery Early Career Researcher Award of the Australian Research Council [DE150100618]; National Science Foundation Astronomy and Astrophysics Fellowship grant [AST-1701546]; ESO Telescopes at the La Silla Paranal Observatory [194-A.2005]
    Additional Links
    http://stacks.iop.org/0004-637X/860/i=2/a=103?key=crossref.4579e78180ee40b4c1a9cce01063070e
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/aac438
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