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    Ubiquitous Molecular Outflows in z > 4 Massive, Dusty Galaxies. II. Momentum-driven Winds Powered by Star Formation in the Early Universe

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    Author
    Spilker, J.S.
    Aravena, M.
    Phadke, K.A.
    Béthermin, M. cc
    Chapman, S.C.
    Dong, C.
    Gonzalez, A.H.
    Hayward, C.C.
    Hezaveh, Y.D.
    Litke, K.C.
    Malkan, M.A.
    Marrone, D.P.
    Narayanan, D.
    Reuter, C.
    Vieira, J.D.
    Weiß, A.
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    Affiliation
    Steward Observatory, University of Arizona
    Issue Date
    2020
    
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    Publisher
    IOP Publishing Ltd
    Citation
    Spilker, J. S., Aravena, M., Phadke, K. A., Béthermin, M., Chapman, S. C., Dong, C., ... & Weiß, A. (2020). Ubiquitous Molecular Outflows in z> 4 Massive, Dusty Galaxies. II. Momentum-driven Winds Powered by Star Formation in the Early Universe. The Astrophysical Journal, 905(2), 86.
    Journal
    Astrophysical Journal
    Rights
    Copyright © 2020. The American Astronomical Society.
    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
    Galactic outflows of molecular gas are a common occurrence in galaxies and may represent a mechanism by which galaxies self-regulate their growth, redistributing gas that could otherwise have formed stars. We previously presented the first survey of molecular outflows at z > 4 toward a sample of massive, dusty galaxies. Here we characterize the physical properties of the molecular outflows discovered in our survey. Using low-redshift outflows as a training set, we find agreement at the factor of 2 level between several outflow rate estimates. We find molecular outflow rates of 150-800 M yr-1 and infer mass loading factors just below unity. Among the high-redshift sources, the molecular mass loading factor shows no strong correlations with any other measured quantity. The outflow energetics are consistent with expectations for momentum-driven winds with star formation as the driving source, with no need for energy-conserving phases. There is no evidence for active galactic nucleus activity in our sample, and while we cannot rule out deeply buried active galactic nuclei, their presence is not required to explain the outflow energetics, in contrast to nearby obscured galaxies with fast outflows. The fraction of the outflowing gas that will escape into the circumgalactic medium (CGM), though highly uncertain, may be as high as 50%. This nevertheless constitutes only a small fraction of the total cool CGM mass based on a comparison to z ∼ 2-3 quasar absorption line studies, but could represent ⪆10% of the CGM metal mass. Our survey offers the first statistical characterization of molecular outflow properties in the very early universe. © 2020. The American Astronomical Society. All rights reserved..
    Note
    Immediate access
    ISSN
    0004-637X
    DOI
    10.3847/1538-4357/abc4e6
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/abc4e6
    Scopus Count
    Collections
    UA Faculty Publications

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