Dark matter annihilation and decay 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) from annihilation (resp. decay) products. The expected gamma- ray flux depends on the so-called ‘ J -factor’ (resp. ‘ D -factor’), the integral of the squared DM density (resp. DM density) along the line-of-sight. Using a large number of simulated dSphs, we define an optimized Jeans analysis setup for the reconstruction of the DM density with stellar- kinematic data. Employing this setup, we provide estimates of astrophysical J - and D -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 astrophysical 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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Vincent Bonnivard, Céline Combet, David Maurin, Matthew G. Walker. Dark matter annihilation and decay factors in the Milky Way's dwarf spheroidal galaxies. 34th International Cosmic Ray Conference, Jul 2015, The Hague, Netherlands. pp.1176, ⟨10.22323/1.236.1176⟩. ⟨hal-01554950⟩

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