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    New limits on the dark matter lifetime from dwarf spheroidal galaxies using Fermi-LAT

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    Author
    Baring, Matthew G.; Ghosh, Tathagata; Queiroz, Farinaldo S.; Sinha, Kuver
    Date
    2016
    Abstract
    Dwarf spheroidal galaxies (dSphs) are promising targets for the indirect detection of dark matter through gamma-ray emission due to their proximity, lack of astrophysical backgrounds and high dark matter density. They are often used to place restrictive bounds on the dark matter annihilation cross section. In this paper, we analyze six years of Fermi-LAT gamma-ray data from 19 dSphs that are satellites of the Milky Way, and derive from a stacked analysis of 15 dSphs, robust 95% confidence level lower limits on the dark matter lifetime for several decay channels and dark matter masses between ∼1  GeV and 10 TeV. Our findings are based on a bin-by-bin maximum likelihood analysis treating the J-factor as a nuisance parameter using the Pass 8 event class. Our constraints from this ensemble are among the most stringent and solid in the literature, and competitive with existing ones coming from the extragalactic gamma-ray background, galaxy clusters, AMS-02 cosmic ray data, Super-K and ICECUBE neutrino data, while rather insensitive to systematic uncertainties. In particular, among gamma-ray searches, we improve existing limits for dark matter decaying into ¯bb (μ+μ−) for dark matter masses below ∼30(200)  GeV, demonstrating that dSphs are compelling targets for constraining dark matter decay lifetimes.
    Citation
    Baring, Matthew G., Ghosh, Tathagata, Queiroz, Farinaldo S., et al.. "New limits on the dark matter lifetime from dwarf spheroidal galaxies using Fermi-LAT." Physical Review D, 93, no. 10 (2016) American Physical Society: https://doi.org/10.1103/PhysRevD.93.103009.
    Published Version
    https://doi.org/10.1103/PhysRevD.93.103009
    Type
    Journal article
    Publisher
    American Physical Society
    Citable link to this page
    https://hdl.handle.net/1911/94199
    Rights
    Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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    • Faculty Publications [4978]
    • Physics and Astronomy Publications [1769]

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    Home | FAQ | Contact Us | Privacy Notice | Accessibility Statement
    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
    Site Map