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    LOW GAS FRACTIONS CONNECT COMPACT STAR-FORMING GALAXIES TO THEIR z ∼ 2 QUIESCENT DESCENDANTS

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    Spilker_2016_ApJ_832_19.pdf
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    Author
    Spilker, Justin S. cc
    Bezanson, Rachel cc
    Marrone, Daniel P. cc
    Weiner, Benjamin cc
    Whitaker, Katherine E. cc
    Williams, Christina C. cc
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2016-11-14
    Keywords
    galaxies: formation
    galaxies: high-redshift
    galaxies: ISM
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    LOW GAS FRACTIONS CONNECT COMPACT STAR-FORMING GALAXIES TO THEIR z ∼ 2 QUIESCENT DESCENDANTS 2016, 832 (1):19 The Astrophysical Journal
    Journal
    The Astrophysical Journal
    Rights
    © 2016. 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
    Early quiescent galaxies at z similar to 2 are known to be remarkably compact compared to their nearby counterparts. Possible progenitors of these systems include galaxies that are structurally similar, but are still rapidly forming stars. Here, we present Karl G. Jansky Very Large Array (VLA) observations of the CO(1-0) line toward three such compact, star-forming galaxies (SFGs) at z similar to 2.3, significantly detecting one. The VLA observations indicate baryonic gas fractions. greater than or similar to 5 times lower and gas depletion timescales. greater than or similar to 10 times shorter than normal, extended massive SFGs at these redshifts. At their current star formation rates, all three objects will deplete their gas reservoirs within 100 Myr. These objects are among the most gas-poor objects observed at z > 2, and are outliers from standard gas scaling relations, a result that remains true regardless of assumptions about the CO-H-2 conversion factor. Our observations are consistent with the idea that compact, SFGs are in a rapid state of transition to quiescence in tandem with the buildup of the z similar to 2 quenched population. In the detected compact galaxy, we see no evidence of rotation or that the CO-emitting gas is spatially extended relative to the stellar light. This casts doubt on recent suggestions that the gas in these compact galaxies is rotating and significantly extended compared to the stars. Instead, we suggest that, at least for this object, the gas is centrally concentrated, and only traces a small fraction of the total galaxy dynamical mass.
    ISSN
    1538-4357
    DOI
    10.3847/0004-637X/832/1/19
    Version
    Final published version
    Sponsors
    U.S. National Science Foundation [AST-1312950]; NASA - Space Telescope Science Institute [HF-51318, HF-51368]; NASA [NAS5-26555]; NIRCam [NAS5-02015]
    Additional Links
    http://stacks.iop.org/0004-637X/832/i=1/a=19?key=crossref.7a2d6acdbae6adbabdae96dd29717536
    ae974a485f413a2113503eed53cd6c53
    10.3847/0004-637X/832/1/19
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    UA Faculty Publications

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