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Dark Matter Constraints from Observations of 25 Milky Way Satellite Galaxies with the Fermi Large Area Telescope

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arxiv 1310.0828 v2 pith:MHC7YYTN submitted 2013-10-02 astro-ph.HE hep-ex

Dark Matter Constraints from Observations of 25 Milky Way Satellite Galaxies with the Fermi Large Area Telescope

The Fermi-LAT Collaboration: M. Ackermann , A. Albert , B. Anderson , L. Baldini , J. Ballet , G. Barbiellini , D. Bastieri , K. Bechtol
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R. Bellazzini E. Bissaldi E. D. Bloom E. Bonamente A. Bouvier T. J. Brandt J. Bregeon M. Brigida P. Bruel R. Buehler S. Buson G. A. Caliandro R. A. Cameron M. Caragiulo P. A. Caraveo C. Cecchi E. Charles A. Chekhtman J. Chiang S. Ciprini R. Claus J. Cohen-Tanugi J. Conrad F. D'Ammando A. de Angelis C. D. Dermer S. W. Digel E. do Couto e Silva P. S. Drell A. Drlica-Wagner R. Essig C. Favuzzi E. C. Ferrara A. Franckowiak Y. Fukazawa S. Funk P. Fusco F. Gargano D. Gasparrini N. Giglietto M. Giroletti G. Godfrey G. A. Gomez-Vargas I. A. Grenier S. Guiriec M. Gustafsson M. Hayashida E. Hays J. Hewitt R. E. Hughes T. Jogler T. Kamae J. Kn\"odlseder D. Kocevski M. Kuss . Larsson L. Latronico M. Llena Garde F. Longo F. Loparco M. N. Lovellette P. Lubrano G. Martinez M. Mayer M. N. Mazziotta P. F. Michelson W. Mitthumsiri T. Mizuno A. A. Moiseev M. E. Monzani A. Morselli I. V. Moskalenko S. Murgia R. Nemmen E. Nuss T. Ohsugi E. Orlando J. F. Ormes J. S. Perkins F. Piron G. Pivato T. A. Porter S. Rain\`o R. Rando M. Razzano S. Razzaque A. Reimer O. Reimer S. Ritz M. S\`anchez-Conde N. Sehgal C. Sgr\`o E. J. Siskind P. Spinelli L. Strigari D. J. Suson H. Tajima H. Takahashi J. B. Thayer L. Tibaldo M. Tinivella D. F. Torres Y. Uchiyama T. L. Usher J. Vandenbroucke G. Vianello V. Vitale M. Werner B. L. Winer K. S. Wood M. Wood G. Zaharijas S. Zimmer
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classification astro-ph.HE hep-ex
keywords darkgalaxiesmatterdwarfspheroidalgamma-raymilkyobservations
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The dwarf spheroidal satellite galaxies of the Milky Way are some of the most dark-matter-dominated objects known. Due to their proximity, high dark matter content, and lack of astrophysical backgrounds, dwarf spheroidal galaxies are widely considered to be among the most promising targets for the indirect detection of dark matter via gamma rays. Here we report on gamma-ray observations of 25 Milky Way dwarf spheroidal satellite galaxies based on 4 years of Fermi Large Area Telescope (LAT) data. None of the dwarf galaxies are significantly detected in gamma rays, and we present gamma-ray flux upper limits between 500 MeV and 500 GeV. We determine the dark matter content of 18 dwarf spheroidal galaxies from stellar kinematic data and combine LAT observations of 15 dwarf galaxies to constrain the dark matter annihilation cross section. We set some of the tightest constraints to date on the the annihilation of dark matter particles with masses between 2 GeV and 10 TeV into prototypical Standard Model channels. We find these results to be robust against systematic uncertainties in the LAT instrument performance, diffuse gamma-ray background modeling, and assumed dark matter density profile.

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