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. 2015 Dec 4;115(23):231301.
doi: 10.1103/PhysRevLett.115.231301. Epub 2015 Nov 30.

Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi Large Area Telescope Data

M Ackermann  1 A Albert  2 B Anderson  3   4 W B Atwood  5 L Baldini  2   6 G Barbiellini  7   8 D Bastieri  9   10 K Bechtol  11 R Bellazzini  12 E Bissaldi  13 R D Blandford  2 E D Bloom  2 R Bonino  14   15 E Bottacini  2 T J Brandt  16 J Bregeon  17 P Bruel  18 R Buehler  1 G A Caliandro  2   19 R A Cameron  2 R Caputo  5 M Caragiulo  13 P A Caraveo  20 C Cecchi  21   22 E Charles  2 A Chekhtman  23 J Chiang  2 G Chiaro  10 S Ciprini  21   24   25 R Claus  2 J Cohen-Tanugi  17 J Conrad  3   4   26 A Cuoco  14   15 S Cutini  21   24   25 F D'Ammando  27   28 A de Angelis  29 F de Palma  13   30 R Desiante  14   31 S W Digel  2 L Di Venere  32 P S Drell  2 A Drlica-Wagner  33 R Essig  34 C Favuzzi  13   32 S J Fegan  18 E C Ferrara  16 W B Focke  2 A Franckowiak  2 Y Fukazawa  35 S Funk  36 P Fusco  13   32 F Gargano  13 D Gasparrini  21   24   25 N Giglietto  13   32 F Giordano  13   32 M Giroletti  27 T Glanzman  2 G Godfrey  2 G A Gomez-Vargas  37   38 I A Grenier  39 S Guiriec  16   40 M Gustafsson  41 E Hays  16 J W Hewitt  42 D Horan  18 T Jogler  2 G Jóhannesson  43 M Kuss  12 S Larsson  4   44 L Latronico  14 J Li  45 L Li  4   44 M Llena Garde  3   4 F Longo  7   8 F Loparco  13   32 P Lubrano  21   22 D Malyshev  2 M Mayer  1 M N Mazziotta  13 J E McEnery  16   46 M Meyer  3   4 P F Michelson  2 T Mizuno  47 A A Moiseev  46   48 M E Monzani  2 A Morselli  37 S Murgia  49 E Nuss  17 T Ohsugi  47 M Orienti  27 E Orlando  2 J F Ormes  50 D Paneque  2   51 J S Perkins  16 M Pesce-Rollins  2   12 F Piron  17 G Pivato  12 T A Porter  2 S Rainò  13   32 R Rando  9   10 M Razzano  12 A Reimer  2   52 O Reimer  2   52 S Ritz  5 M Sánchez-Conde  3   4 A Schulz  1 N Sehgal  53 C Sgrò  12 E J Siskind  54 F Spada  12 G Spandre  12 P Spinelli  13   32 L Strigari  55 H Tajima  2   56 H Takahashi  35 J B Thayer  2 L Tibaldo  2 D F Torres  45   57 E Troja  16   46 G Vianello  2 M Werner  52 B L Winer  58 K S Wood  59 M Wood  2 G Zaharijas  60   61 S Zimmer  3   4 Fermi-LAT Collaboration
Affiliations

Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi Large Area Telescope Data

M Ackermann et al. Phys Rev Lett. .

Abstract

The dwarf spheroidal satellite galaxies (dSphs) of the Milky Way are some of the most dark matter (DM) dominated objects known. We report on γ-ray observations of Milky Way dSphs based on six years of Fermi Large Area Telescope data processed with the new Pass8 event-level analysis. None of the dSphs are significantly detected in γ rays, and we present upper limits on the DM annihilation cross section from a combined analysis of 15 dSphs. These constraints are among the strongest and most robust to date and lie below the canonical thermal relic cross section for DM of mass ≲100 GeV annihilating via quark and τ-lepton channels.

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