Dark matter in the Milky Way may annihilate directly into. rays, producing a monoenergetic spectral line. Therefore, detecting such a signature would be strong evidence for dark matter annihilation or decay. We search for spectral lines in the Fermi Large Area Telescope observations of the Milky Way halo in the energy range 200 MeV-500 GeV using analysis methods from our most recent line searches. The main improvements relative to previous works are our use of 5.8 years of data reprocessed with the Pass 8 event-level analysis and the additional data resulting from the modified observing strategy designed to increase exposure of the Galactic center region. We search in five sky regions selected to optimize sensitivity to different theoretically motivated dark matter scenarios and find no significant detections. In addition to presenting the results from our search for lines, we also investigate the previously reported tentative detection of a line at 133 GeV using the new Pass 8 data.

Updated search for spectral lines from Galactic dark matter interactions with pass 8 data from the Fermi Large Area Telescope

D'AMMANDO, FILIPPO;
2015

Abstract

Dark matter in the Milky Way may annihilate directly into. rays, producing a monoenergetic spectral line. Therefore, detecting such a signature would be strong evidence for dark matter annihilation or decay. We search for spectral lines in the Fermi Large Area Telescope observations of the Milky Way halo in the energy range 200 MeV-500 GeV using analysis methods from our most recent line searches. The main improvements relative to previous works are our use of 5.8 years of data reprocessed with the Pass 8 event-level analysis and the additional data resulting from the modified observing strategy designed to increase exposure of the Galactic center region. We search in five sky regions selected to optimize sensitivity to different theoretically motivated dark matter scenarios and find no significant detections. In addition to presenting the results from our search for lines, we also investigate the previously reported tentative detection of a line at 133 GeV using the new Pass 8 data.
2015
Ackermann M; Ajello M; Albert A; Anderson B; Atwood WB; Baldini L; Barbiellini G; Bastieri D; Bellazzini R; Bissaldi E; Blandford RD; Bloom ED; Bonino R; Bottacini E; Brandt TJ; Bregeon J; Bruel P; Buehler R; Buson S; 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; Favuzzi C; Fegan SJ; Franckowiak A; Fukazawa Y; Funk S; Fusco P; Gargano F; Gasparrini D; Giglietto N; Giordano F; Giroletti M; Godfrey G; Gomez-Vargas GA; Grenier IA; Grove JE; Guiriec S; Gustafsson M; Hewitt JW; Hill AB; Horan D; Johannesson G; Johnson RP; Kuss M; Larsson S; Latronico L; Li J; Li L; Longo F; Loparco F; Lovellette MN; Lubrano P; Malyshev D; Mayer M; Mazziotta MN; McEnery JE; Michelson PF; Mizuno T; Moiseev AA; Monzani ME; Morselli A; Murgia S; Nuss E; Ohsugi T; Orienti M; Orlando E; Ormes JF; Paneque D; Pesce-Rollins M; Piron F; Pivato G; Raino S; Rando R; Razzano M; Reimer A; Reposeur T; Ritz S; Sanchez-Conde M; Schulz A; Sgro C; Siskind EJ; Spada F; Spandre G; Spinelli P; Tajima H; Takahashi H; Thayer JB; Tibaldo L; Torres DF; Tosti G; Troja E; Vianello G; Werner M; Winer BL; Wood KS; Wood M; Zaharijas G; Zimmer S
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/595681
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