The dwarf spheroidal satellite galaxies (dSphs) of the Milky Way are some of the most dark matter (DM) dominated objects known. We report on gamma-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 gamma 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 less than or similar to 100 GeV annihilating via quark and tau-lepton channels.
Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi Large Area Telescope Data / Ackermann M; Albert A; Anderson B; Atwood WB; Baldini L; Barbiellini G; Bastieri D; Bechtol K; Bellazzini R; Bissaldi E; Blandford RD; Bloom ED; Bonino R; Bottacini E; Brandt TJ; Bregeon J; Bruel P; Buehler R; Caliandro GA; Cameron RA; Caputo R; Caragiulo M; Caraveo PA; Cecchi C; Charles E; Chekhtman A; Chiang J; Chiaro G; Ciprini S; Claus R; Cohen-Tanugi J; Conrad J; Cuoco A; Cutini S; DAmmando F; de Angelis A; de Palma F; Desiante R; Digel SW; Di Venere L; Drell PS; Drlica-Wagner A; Essig R; Favuzzi C; Fegan SJ; Ferrara EC; Focke WB; Franckowiak A; Fukazawa Y; Funk S; Fusco P; Gargano F; Gasparrini D; Giglietto N; Giordano F; Giroletti M; Glanzman T; Godfrey G; Gomez-Vargas GA; Grenier IA; Guiriec S; Gustafsson M; Hays E; Hewitt JW; Horan D; Jogler T; Johannesson G; Kuss M; Larsson S; Latronico L; Li J; Li L; Garde ML; Longo F; Loparco F; Lubrano P; Malyshev D; Mayer M; Mazziotta MN; McEnery JE; Meyer M; Michelson PF; Mizuno T; Moiseev AA; Monzani ME; Morselli A; Murgia S; Nuss E; Ohsugi T; Orienti M; Orlando E; Ormes JF; Paneque D; Perkins JS; Pesce-Rollins M; Piron F; Pivato G; Porter TA; Raino S; Rando R; Razzano M; Reimer A; Reimer O; Ritz S; Sanchez-Conde M; Schulz A; Sehgal N; Sgro C; Siskind EJ; Spada F; Spandre G; Spinelli P; Strigari L; Tajima H; Takahashi H; Thayer JB; Tibaldo L; Torres DF; Troja E; Vianello G; Werner M; Winer BL; Wood KS; Wood M; Zaharijas G; Zimmer S. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 115:23(2015), pp. 231301.1-231301.8. [10.1103/PhysRevLett.115.231301]
Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi Large Area Telescope Data
D'AMMANDO, FILIPPO;
2015
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 gamma-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 gamma 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 less than or similar to 100 GeV annihilating via quark and tau-lepton channels.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
