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    Violent Quenching: Molecular Gas Blown to 1000 km s−1 during a Major Merger

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    Rudnick_2018.pdf (2.367Mb)
    Issue Date
    2018-08-23
    Author
    Geach, James E.
    Tremonti, Christy
    Diamond-Stanic, A. M.
    Sell, Paul H.
    Kepley, Amanda
    Coil, Alison L.
    Rudnick, Gregory H.
    Hickox, Ryan C.
    Moustakas, John
    Yang, Yujin
    Publisher
    American Astronomical Society
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Metadata
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    Abstract
    We present Atacama Large Millimeter/submillimeter Array observations of a massive (${M}_{\star }\approx {10}^{11}\,{M}_{\odot }$) compact (${r}_{{\rm{e}},\mathrm{UV}}\approx 100$ pc) merger remnant at z = 0.66 that is driving a 1000 km s−1 outflow of cool gas, with no observational trace of an active galactic nucleus (AGN). We resolve molecular gas on scales of approximately 1–2 kpc, and our main finding is the discovery of a wing of blueshifted CO J(2 → 1) emission out to −1000 km s−1 relative to the stars. We argue that this is the molecular component of a multiphase outflow, expelled from the central starburst within the past 5 Myr through stellar feedback, although we cannot rule out previous AGN activity as a launching mechanism. If the latter is true, then this is an example of a relic multiphase AGN outflow. We estimate a molecular mass outflow rate of approximately 300 M ⊙ yr−1, or about one third of the 10 Myr-averaged star formation rate. This system epitomizes the multiphase "blowout" episode following a dissipational major merger—a process that has violently quenched central star formation and supermassive black hole growth.
    URI
    http://hdl.handle.net/1808/26720
    DOI
    https://doi.org/10.3847/2041-8213/aad8b6
    Collections
    • Physics and Astronomy Scholarly Works [1636]
    Citation
    Geach, J. E., Tremonti, C., Diamond-Stanic, A. M., Sell, P. H., Kepley, A. A., Coil, A. L., ... & Yang, Y. (2018). Violent Quenching: Molecular Gas Blown to 1000 km s− 1 during a Major Merger. The Astrophysical Journal Letters, 864(1), L1.

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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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