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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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    RudnickGH_2017.pdf (1.714Mb)
    Issue Date
    2017-11-01
    Author
    Rudnick, Gregory H.
    Hodge, Jacqueline
    Walter, Fabian
    Momcheva, Ivelina
    Tran, Kim-Vy H.
    Papovich, Casey J.
    da Cunha, Elisabete
    Decarli, Roberto
    Saintonge, Amelie
    Willmer, Christopher
    Lotz, Jennifer
    Lentati, Lindley
    Publisher
    American Astronomical Society
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Rights
    © 2017. The American Astronomical Society. All rights reserved.
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    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 $\gt 5$. Both galaxies have log(${{ \mathcal M }}_{\star }$/${{ \mathcal M }}_{\odot }$) > 11 and are gas rich, with ${{ \mathcal M }}_{\mathrm{mol}}$/(${{ \mathcal M }}_{\star }$+${{ \mathcal M }}_{\mathrm{mol}}$) ~ 0.17–0.45. One of these galaxies lies on the star formation rate (SFR)–${{ \mathcal M }}_{\star }$ 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 $z\lt 1$ clusters.
    URI
    http://hdl.handle.net/1808/27304
    DOI
    https://doi.org/10.3847/1538-4357/aa87b2
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    • Physics and Astronomy Scholarly Works [1404]
    Citation
    Rudnick, G., Hodge, J., Walter, F., Momcheva, I., Tran, K. V., Papovich, C., ... & Lotz, J. (2017). Deep CO (1–0) Observations of z= 1.62 Cluster Galaxies with Substantial Molecular Gas Reservoirs and Normal Star Formation Efficiencies. The Astrophysical Journal, 849(1), 27.

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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