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    Deep CO(1–0) Observations of z = 1.62 Cluster Galaxies with Substantial Molecular Gas Reservoirs and Normal Star Formation Efficiencies

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    Rudnick_2017_ApJ_849_27.pdf
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    Author
    Rudnick, Gregory cc
    Hodge, Jacqueline cc
    Walter, Fabian cc
    Momcheva, Ivelina G. cc
    Tran, Kim-Vy H. cc
    Papovich, Casey cc
    da Cunha, Elisabete cc
    Decarli, R. cc
    Saintonge, Amelie
    Willmer, Christopher N. A. cc
    Lotz, Jennifer cc
    Lentati, Lindley cc
    Show allShow less
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2017-10-26
    Keywords
    galaxies: clusters: general
    galaxies: evolution
    galaxies: high-redshift
    galaxies: ISM
    galaxies: star formation
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Deep CO(1–0) Observations of z = 1.62 Cluster Galaxies with Substantial Molecular Gas Reservoirs and Normal Star Formation Efficiencies 2017, 849 (1):27 The Astrophysical Journal
    Journal
    The Astrophysical Journal
    Rights
    © 2017. 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
    We present an extremely deep CO(1-0) observation of a confirmed z = 1.62 galaxy cluster. We detect two spectroscopically confirmed cluster members in CO(1-0) with signal-to-noise ratio >5. Both galaxies have log (M-star/M-circle dot) > 11 and are gas rich, with M-mol/(M-star + M-mol) similar to 0.17-0.45. One of these galaxies lies on the star formation rate (SFR)-M-star sequence, while the other lies an order of magnitude below. We compare the cluster galaxies to other SFR-selected galaxies with CO measurements and find that they have CO luminosities consistent with expectations given their infrared luminosities. We also find that they have gas fractions and star formation efficiencies (SFE) comparable to what is expected from published field galaxy scaling relations. The galaxies are compact in their stellar light distribution, at the extreme end for all high-redshift star-forming galaxies. However, their SFE is consistent with other field galaxies at comparable compactness. This is similar to two other sources selected in a blind CO survey of the HDF-N. Despite living in a highly quenched protocluster core, the molecular gas properties of these two galaxies, one of which may be in the process of quenching, appear entirely consistent with field scaling relations between the molecular gas content, stellar mass, star formation rate, and redshift. We speculate that these cluster galaxies cannot have any further substantive gas accretion if they are to become members of the dominant passive population in z < 1 clusters.
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/aa87b2
    Version
    Final published version
    Sponsors
    HST program [HST-GO-12590.011-A, AR-14310.001]; NSF AST [1211358, 1517815]; Alexander von Humboldt foundation; VIDI research program [639.042.611]; Netherlands Organisation for Scientific Research (NWO); George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy
    Additional Links
    http://stacks.iop.org/0004-637X/849/i=1/a=27?key=crossref.b888d0fdf03a5c9ac272fe5fe875e749
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/aa87b2
    Scopus Count
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    UA Faculty Publications

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