Dark matter annihilation factors in the Milky Way’s dwarf spheroidal galaxies

Abstract : The Milky Way's dwarf spheroidal (dSph) galaxies are among the best targets for the indirect detection of dark matter (DM) with γ-rays. The expected gamma-ray flux depends on the so-called 'J-factor', the integral of the squared DM density along the line-of-sight. Using a large number of simulated dSphs, we have defined an optimized Jeans analysis setup for the reconstruction of the DM density with stellar-kinematic data. Employing this setup, we provide here estimates of astrophysical J-factors for twenty-two Galactic dSphs, including the newly discovered Reticulum II. We finally identify several criteria that may indicate a contamination of a kinematic dataset by interlopers, leading to unreliable J-factors. We find that the kinematic sample of Segue I, one of the closest dSph, might be affected by this issue.
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Contributor : Emmanuelle Vernay <>
Submitted on : Wednesday, September 9, 2015 - 9:43:06 AM
Last modification on : Tuesday, May 22, 2018 - 9:48:11 PM

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V. Bonnivard, C. Combet, D. Maurin, M.G. Walker, A. Geringer-Sameth. Dark matter annihilation factors in the Milky Way’s dwarf spheroidal galaxies. XIV International Conference on Topics in Astroparticle and Underground Physics (TAUP 2015), Sep 2015, Torino, Italy. pp.042005, ⟨10.1088/1742-6596/718/4/042005⟩. ⟨in2p3-01196065⟩

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