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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Communication dans un congrès
XIV International Conference on Topics in Astroparticle and Underground Physics (TAUP 2015), Sep 2015, Torino, Italy. Journal of Physics: Conference Series, 718, pp.042005, 2016, 〈10.1088/1742-6596/718/4/042005〉
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http://hal.in2p3.fr/in2p3-01196065
Contributeur : Emmanuelle Vernay <>
Soumis le : mercredi 9 septembre 2015 - 09:43:06
Dernière modification le : jeudi 11 janvier 2018 - 06:13:10

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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. Journal of Physics: Conference Series, 718, pp.042005, 2016, 〈10.1088/1742-6596/718/4/042005〉. 〈in2p3-01196065〉

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