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    HYDRODYNAMICAL COUPLING OF MASS AND MOMENTUM IN MULTIPHASE GALACTIC WINDS

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    Schneider_2017_ApJ_834_144.pdf
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    Author
    Schneider, Evan E. cc
    Robertson, Brant E. cc
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2017-01-10
    Keywords
    galaxies: evolution
    hydrodynamics
    ISM: clouds
    supernovae: general
    turbulence
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    HYDRODYNAMICAL COUPLING OF MASS AND MOMENTUM IN MULTIPHASE GALACTIC WINDS 2017, 834 (2):144 The Astrophysical Journal
    Journal
    The Astrophysical Journal
    Rights
    © 2017. 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
    Using a set of high-resolution hydrodynamical simulations run with the Cholla. code, we investigate how mass and momentum couple to the multiphase components of galactic winds. The simulations model the interaction between a hot wind driven by supernova explosions and a cooler, denser cloud of interstellar or circumgalactic media. By resolving scales of Delta x < 0.1 pc over > 100 pc distances, our calculations capture how the cloud disruption leads to a distribution of densities and temperatures in the resulting multiphase outflow and quantify the mass and momentum associated with each phase. We find that the multiphase wind contains comparable mass and momenta in phases over a wide range of densities and temperatures extending from the hot wind (n approximate to 10(-2.5) cm(-3), T approximate to 10(6.5) K) to the coldest components (n approximate to 10(2) cm(-3), T approximate to 10(2) K). We further find that the momentum distributes roughly in proportion to the mass in each phase, and the mass loading of the hot phase by the destruction of cold, dense material is an efficient process. These results provide new insight into the physical origin of observed multiphase galactic outflows and inform galaxy formation models that include coarser treatments of galactic winds. Our results confirm that cool gas observed in outflows at large distances from the galaxy (greater than or similar to 1 kpc) likely does not originate through the entrainment of cold material near the central starburst.
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/834/2/144
    Version
    Final published version
    Sponsors
    National Science Foundation [1228509]; DOE Office of Science User Facility [DE-AC05-00OR22725]
    Additional Links
    http://stacks.iop.org/0004-637X/834/i=2/a=144?key=crossref.e25f767345ce4ccf39509c9438a0088c
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/834/2/144
    Scopus Count
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    UA Faculty Publications

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