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    The Smith Cloud and its dark matter halo: survival of a Galactic disc passage

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    1404.3209.pdf (3.045Mb)
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    https://academic.oup.com/mnras/article/442/4/2883/1339686
    Permanent Link
    https://doi.org/10.1093/mnras/stu1028
    http://hdl.handle.net/11603/19562
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    • UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
    • UMBC Joint Center for Earth Systems Technology (JCET)
    • UMBC Physics Department
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    Author/Creator
    Nichols, Matthew
    Mirabal, Nestor
    Agertz, Oscar
    Lockman, Felix J.
    Bland-Hawthorn, Joss
    Date
    2014-06-26
    Type of Work
    10 pages
    Text
    journal articles preprints
    Citation of Original Publication
    Matthew Nichols, Nestor Mirabal, Oscar Agertz, Felix J. Lockman and Joss Bland-Hawthorn, The Smith Cloud and its dark matter halo: survival of a Galactic disc passage, Monthly Notices of the Royal Astronomical Society, Volume 442, Issue 4,Pages 2883–2891 (2014), https://doi.org/10.1093/mnras/stu1028
    Rights
    This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society Published by Oxford University Press on behalf of the Royal Astronomical Society.
    Abstract
    Under conservative assumptions about the Galaxy, the derived velocity of the Smith Cloud indicates that it will have undergone at least one passage of the Galactic disc. Using hydrodynamic simulations, we examine the present-day structure of the Smith Cloud and find that a dark matter supported cloud is able to reproduce the observed present-day neutral hydrogen mass, column density distribution and morphology. In this case, the dark matter halo becomes elongated owing to the tidal interaction with the Galactic disc. Clouds in models neglecting dark matter confinement are destroyed upon disc passage, unless the initial cloud mass is well in excess of what is observed today. We then determine integrated flux upper limits to the gamma-ray emission around such a hypothesized dark matter core in the Smith Cloud. No statistically significant core or extended gamma-ray emission are detected down to a 95 per cent confidence level upper limit of 1.4 × 10⁻¹⁰ ph cm⁻² s⁻¹ in the 1–300 GeV energy range. For the derived distance of 12.4 kpc, the Fermi upper limits set the first tentative constraints on the dark matter cross-sections annihilating into τ+τ− and bb¯ for a high-velocity cloud.


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    Albin O. Kuhn Library & Gallery
    University of Maryland, Baltimore County
    1000 Hilltop Circle
    Baltimore, MD 21250
    www.umbc.edu/scholarworks

    Contact information:
    Email: scholarworks-group@umbc.edu
    Phone: 410-455-3021


    If you wish to submit a copyright complaint or withdrawal request, please email mdsoar-help@umd.edu.