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    Massive compact galaxies with high-velocity outflows: morphological analysis and constraints on AGN activity

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    Sell_compact_galaxies2014.pdf (15.59Mb)
    Issue Date
    2014-07-11
    Author
    Sell, Paul H.
    Tremonti, Christy
    Hickox, Ryan C.
    Diamond-Stanic, A. M.
    Moustakas, J.
    Coil, Alison L.
    Williams, A.
    Rudnick, Gregory H.
    Robaina, A.
    Geach, James E.
    Heinz, S.
    Wilcots, E. M.
    Publisher
    Oxford University Press
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Metadata
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    Abstract
    We investigate the process of rapid star formation quenching in a sample of 12 massive galaxies at intermediate redshift (z ∼ 0.6) that host high-velocity ionized gas outflows (v > 1000 km s−1). We conclude that these fast outflows are most likely driven by feedback from star formation rather than active galactic nuclei (AGNs). We use multiwavelength survey and targeted observations of the galaxies to assess their star formation, AGN activity, and morphology. Common attributes include diffuse tidal features indicative of recent mergers accompanied by bright, unresolved cores with effective radii less than a few hundred parsecs. The galaxies are extraordinarily compact for their stellar mass, even when compared with galaxies at z ∼ 2–3. For 9/12 galaxies, we rule out an AGN contribution to the nuclear light and hypothesize that the unresolved core comes from a compact central starburst triggered by the dissipative collapse of very gas-rich progenitor merging discs. We find evidence of AGN activity in half the sample but we argue that it accounts for only a small fraction (≲10 per cent) of the total bolometric luminosity. We find no correlation between AGN activity and outflow velocity and we conclude that the fast outflows in our galaxies are not powered by ongoing AGN activity, but rather by recent, extremely compact starbursts.
    Description
    This is the published version. Copyright © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
    URI
    http://hdl.handle.net/1808/19280
    DOI
    https://doi.org/10.1093/mnras/stu636
    Collections
    • Physics & Astronomy Scholarly Works [1713]
    Citation
    Sell, P. H., C. A. Tremonti, R. C. Hickox, A. M. Diamond-Stanic, J. Moustakas, A. Coil, A. Williams, G. Rudnick, A. Robaina, J. E. Geach, S. Heinz, and E. M. Wilcots. "Massive Compact Galaxies with High-velocity Outflows: Morphological Analysis and Constraints on AGN Activity." Monthly Notices of the Royal Astronomical Society 441.4 (2014): 3417-443. http://dx.doi.org/10.1093/mnras/stu636

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    KU Libraries
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    785-864-8983

    KU Libraries
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    Lawrence, KS 66045
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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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