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    HIERARCHICAL FORMATION IN ACTION: CHARACTERIZING ACCELERATED GALAXY EVOLUTION IN COMPACT GROUPS USING WHOLE-SKY WISE DATA

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    apj_821_2_113.pdf
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    Author
    Zucker, Catherine cc
    Walker, Lisa May
    Johnson, Kelsey
    Gallagher, Sarah
    Alatalo, Katherine cc
    Tzanavaris, Panayiotis
    Affiliation
    Univ Arizona, Dept Astron
    Issue Date
    2016-04-20
    Keywords
    galaxies: evolution
    galaxies: groups: general
    galaxies: interactions
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    HIERARCHICAL FORMATION IN ACTION: CHARACTERIZING ACCELERATED GALAXY EVOLUTION IN COMPACT GROUPS USING WHOLE-SKY WISE DATA 2016, 821 (2):113 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
    Compact groups provide an environment to study the growth of galaxies amid multiple prolonged interactions. With their dense galaxy concentrations and relatively low velocity dispersions, compact groups mimic the conditions of hierarchical galaxy assembly. Compact group galaxies are known to show a bimodality in Spitzer IRAC infrared color space: galaxies are preferentially either quiescent with low specific star formation rates (SSFRs) or prolifically forming stars-galaxies with moderate levels of specific star formation are rare. Previous Spitzer IRAC studies identifying this "canyon" have been limited by small number statistics. We utilize whole-sky Wide-field Infrared Survey Explorer (WISE) data to study 163 compact groups, thereby tripling our previous sample and including more galaxies with intermediate mid-IR colors indicative of moderate SSFRs. We define a distinct WISE. mid-IR color space (log [f(12)/f(4.6)]) versus (log [f(22)/f(3.4)]) that we use to identify canyon galaxies from the larger sample. We confirm that compact group galaxies show a bimodal distribution in the mid-infrared and identify 37 canyon galaxies with reliable photometry and intermediate mid-IR colors. Morphologically, we find that the canyon harbors a large population of both Sa-Sbc and E/S0 type galaxies, and that they fall on the optical red sequence rather than the green valley. Finally, we provide a catalog of WISE. photometry for 567 of 652 galaxies selected from the sample of 163 compact groups.
    ISSN
    1538-4357
    DOI
    10.3847/0004-637X/821/2/113
    Version
    Final published version
    Sponsors
    National Aeronautics and Space Administration; Alfred P. Sloan Foundation; U.S. Department of Energy Office of Science; Virginia Space Grant Consortium; University of Virginia College of Arts and Sciences; Natural Sciences and Engineering Research Council of Canada
    Additional Links
    http://stacks.iop.org/0004-637X/821/i=2/a=113?key=crossref.42b89048e0b7c0a7f65b77ee56225d36
    ae974a485f413a2113503eed53cd6c53
    10.3847/0004-637X/821/2/113
    Scopus Count
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    UA Faculty Publications

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