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http://hdl.handle.net/20.500.12386/24872
Titolo: | Updated search for spectral lines from Galactic dark matter interactions with pass 8 data from the Fermi Large Area Telescope | Autori: | Ackermann, M. Ajello, M. Albert, A. Anderson, B. Atwood, W. B. Baldini, L. Barbiellini, G. Bastieri, D. Bellazzini, R. Bissaldi, E. Blandford, R. D. Mizuno, T. Moiseev, A. A. Monzani, M. E. Morselli, A. Murgia, S. Nuss, E. Ohsugi, T. Orienti, M. Orlando, E. Ormes, J. F. Schulz, A. Paneque, D. Pesce-Rollins, M. Piron, F. Pivato, G. Rainò, S. Rando, R. Razzano, M. Reimer, A. Reposeur, T. Ritz, S. Sgrò, C. Sánchez-Conde, M. Siskind, E. J. Spada, F. Spandre, G. Spinelli, P. Tajima, H. Takahashi, H. Thayer, J. B. Tibaldo, L. Bloom, E. D. Torres, D. F. Tosti, G. Troja, E. Vianello, G. Werner, M. Winer, B. L. Wood, K. S. Wood, M. Zaharijas, G. Zimmer, S. Bonino, R. Fermi LAT Collaboration Bottacini, E. Brandt, T. J. Bregeon, J. Bruel, P. Buehler, R. Buson, S. Caliandro, G. A. Cameron, R. A. Caputo, R. Caragiulo, M. CARAVEO, PATRIZIA 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, S. W. Di Venere, L. Drell, P. S. Drlica-Wagner, A. Favuzzi, C. Fegan, S. J. Franckowiak, A. Fukazawa, Y. Funk, S. Fusco, P. Gargano, F. Gasparrini, D. Giglietto, N. Giordano, F. GIROLETTI, MARCELLO Godfrey, G. Gomez-Vargas, G. A. Grenier, I. A. Grove, J. E. Guiriec, S. Gustafsson, M. Hewitt, J. W. Hill, A. B. Horan, D. Jóhannesson, G. Johnson, R. P. Kuss, M. Larsson, S. Latronico, L. Li, J. Li, L. Longo, F. Loparco, F. Lovellette, M. N. Lubrano, P. Malyshev, D. Mayer, M. Mazziotta, M. N. McEnery, J. E. Michelson, P. F. |
Data pubblicazione: | 2015 | Rivista: | PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY | Numero: | 91 | Fascicolo: | 12 | Da pagina:: | 122002 | Abstract: | Dark matter in the Milky Way may annihilate directly into γ 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. | Acknowledgments: | ACKNOWLEDGMENTS The Fermi-LAT Collaboration acknowledges generous ongoing support from a number of agencies and institutes that have supported both the development and the operation of the LAT as well as scientific data analysis. These include the National Aeronautics and Space Administration and the Department of Energy in the United States, the Commissariat à l’Energie Atomique and the Centre National de la Recherche Scientifique/Institut National de Physique Nucléaire et de Physique des Particules in France, the Agenzia Spaziale Italiana and the Istituto Nazionale di Fisica Nucleare in Italy, the Ministry of Education, Culture, Sports, Science and Technology (MEXT), the High Energy Accelerator Research Organization (KEK), and the Japan Aerospace Exploration Agency (JAXA) in Japan, and the K. A. Wallenberg Foundation, the Swedish Research Council, and the Swedish National Space Board in Sweden. Additional support for science analysis during the operations phase is gratefully acknowledged from the Istituto Nazionale di Astrofisica in Italy and the Centre National d’Études Spatiales in France. B. Anderson is supported by the Royal Swedish Academy of Sciences through a grant from the K. A. Wallenberg Foundation. S. G. received support from a NASA postdoctoral fellowship. A. B. H. is supported by the Marie Curie International Outgoing Fellowship for Career Development through the FP7/2007–2013 Programme (Grant No. 257861). M. R. received funding from the Italian Ministry of Education, University and Research (MIUR) through Contract No. FIRB-2012-RBFR12PM1F. | URI: | http://hdl.handle.net/20.500.12386/24872 | URL: | https://link.aps.org/accepted/10.1103/PhysRevD.91.122002 | ISSN: | 1550-7998 | DOI: | 10.1103/PhysRevD.91.122002 | Bibcode ADS: | 2015PhRvD..91l2002A | Fulltext: | open |
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