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

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, D'Ammando 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 (2015)

Publication Status: Published

Publication Type: Journal article

Publication year: 2015


Publisher: American Physical Society

Book Volume: 91

DOI: 10.1103/PhysRevD.91.122002


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.

Authors with CRIS profile

Involved external institutions

National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF) IT Italy (IT) Stockholm University / Stockholms universitet SE Sweden (SE) Stanford University US United States (USA) (US) University of California Santa Cruz US United States (USA) (US) National Institute for Nuclear Physics / Istituto Nazionale di Fisica Nucleare (INFN) IT Italy (IT) Politecnico di Bari IT Italy (IT) École Polytechnique - Université Paris-Saclay FR France (FR) Commissariat à l'énergie atomique FR France (FR) Georg-August-Universität Göttingen DE Germany (DE) University of Maryland, Baltimore County US United States (USA) (US) Spanish National Research Council / Consejo Superior de Investigaciones Científicas (CSIC) ES Spain (ES) University of Montpellier / Université Montpellier FR France (FR) University of California Irvine US United States (USA) (US) Leopold-Franzens-Universität Innsbruck / University of Innsbruck AT Austria (AT) Ohio State University US United States (USA) (US) Université Bordeaux 1, Sciences et Technologies FR France (FR) University of Udine / Università degli Studi di Udine IT Italy (IT) U.S. Naval Research Laboratory US United States (USA) (US) University of Iceland (UI) / Háskóli Íslands IS Iceland (IS) Clemson University US United States (USA) (US) University of Padua / Universita degli Studi di Padova IT Italy (IT) Deutsches Elektronen-Synchrotron DESY DE Germany (DE) University of Maryland US United States (USA) (US) Hiroshima University / 広島大学 JP Japan (JP) University of Denver US United States (USA) (US) NYCB Real-Time Computing, Inc. US United States (USA) (US) National Aeronautics and Space Administration (NASA) US United States (USA) (US) Fermi National Accelerator Laboratory (Fermilab) US United States (USA) (US) AlbaNova University Centre / Kungliga Tekniska Högskolan AlbaNova Universitetscentrum SE Sweden (SE)

How to cite


Ackermann, M., Ajello, M., Albert, A., Anderson, B., Atwood, W.B., Baldini, L.,... Zimmer, S. (2015). Updated search for spectral lines from Galactic dark matter interactions with pass 8 data from the Fermi Large Area Telescope. Physical Review D - Particles, Fields, Gravitation and Cosmology, 91. https://doi.org/10.1103/PhysRevD.91.122002


Ackermann, M., et al. "Updated search for spectral lines from Galactic dark matter interactions with pass 8 data from the Fermi Large Area Telescope." Physical Review D - Particles, Fields, Gravitation and Cosmology 91 (2015).

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