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Fermi LAT Search for Photon Lines from 30 to 200 GeV and Dark Matter Implications

The Fermi LAT Collaboration, A. A. Abdo, M. Ackermann, M. Ajello, W. B. Atwood, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, E. D. Bloom, E. Bonamente, A. W. Borgland, A. Bouvier, J. Bregeon, A. Brez, M. Brigida, P. Bruel, T. H. Burnett, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, S. Carrigan, J. M. Casandjian, C. Cecchi, O. C. Elik, A. Chekhtman, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, C. D. Dermer, A. de Angelis, F. de Palma, S. W. Digel, E. do Couto e Silva, P. S. Drell, A. Drlica-Wagner, R. Dubois, D. Dumora, Y. Edmonds, R. Essig, C. Farnier, C. Favuzzi, S. J. Fegan, W. B. Focke, P. Fortin, M. Frailis, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, F. Giordano, T. Glanzman, G. Godfrey, I. A. Grenier, J. E. Grove, L. Guillemot, S. Guiriec, M. Gustafsson, D. Hadasch, A. K. Harding, D. Horan, R. E. Hughes, M. S. Jackson, G. J . ohannesson, A. S. Johnson, R. P. Johnson, W. N. Johnson, T. Kamae, H. Katagiri, J. Kataoka, N. Kawai, M. Kerr, J. Kno . dlseder, M. Kuss, J. Lande, L. Latronico, M. Llena Garde, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, A. Makeev, M. N. Mazziotta, J. E. McEnery, C. Meurer, P. F. Michelson, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, P. L. Nolan, J. P. Norris, E. Nuss, T. Ohsugi, N. Omodei, E. Orlando, J. F. Ormes, M. Ozaki, D. Paneque, J. H. Panetta, D. Parent, V. Pelassa, M. Pepe, M. Pesce-Rollins, F. Piron, S. Rainó, R. Rando, M. Razzano, A. Reimer, O. Reimer, T. Reposeur, J. Ripken, S. Ritz, A. Y. Rodriguez, M. Roth, H. F. -W. Sadrozinski, A. Sander, P. M. Saz Parkinson, J. D. Scargle, T. L. Schalk, A. Sellerholm, C. Sgró, E. J. Siskind, D. A. Smith, P. D. Smith, G. Spandre, P. Spinelli, J. -L. Starck, M. S. Strickman, D. J. Suson, H. Tajima, H. Takahashi, T. Tanaka, J. B. Thayer, J. G. Thayer, L. Tibaldo, D. F. Torres, Y. Uchiyama, T. L. Usher, V. Vasileiou, N. Vilchez, V. Vitale, A. P. Waite, P. Wang, B. L. Winer, K. S. Wood, T. Ylinen, M. Ziegler

Abstract

Dark matter (DM) particle annihilation or decay can produce monochromatic $γ$-rays readily distinguishable from astrophysical sources. $γ$-ray line limits from 30 GeV to 200 GeV obtained from 11 months of Fermi Large Area Space Telescope data from 20-300 GeV are presented using a selection based on requirements for a $γ$-ray line analysis, and integrated over most of the sky. We obtain $γ$-ray line flux upper limits in the range $0.6-4.5\times 10^{-9}\mathrm{cm}^{-2}\mathrm{s}^{-1}$, and give corresponding DM annihilation cross-section and decay lifetime limits. Theoretical implications are briefly discussed.

Fermi LAT Search for Photon Lines from 30 to 200 GeV and Dark Matter Implications

Abstract

Dark matter (DM) particle annihilation or decay can produce monochromatic -rays readily distinguishable from astrophysical sources. -ray line limits from 30 GeV to 200 GeV obtained from 11 months of Fermi Large Area Space Telescope data from 20-300 GeV are presented using a selection based on requirements for a -ray line analysis, and integrated over most of the sky. We obtain -ray line flux upper limits in the range , and give corresponding DM annihilation cross-section and decay lifetime limits. Theoretical implications are briefly discussed.

Paper Structure

This paper contains 1 equation, 1 figure, 1 table.

Figures (1)

  • Figure 1: A binned representation of a typical fit (done unbinned), here centered at 40 GeV, used to extract the flux upper limits presented in the tables. The fitting process is described in the text. In the main part of the figure, the lower (upper) dotted line is the signal (background) from the fit and the red(or black) line is the total fit. This fit also shows the largest line "signal" that was obtained in the reported energy region. The inset shows a blow-up of the signal, which is the line energy response function, $S(E)$, used in this fit, and is typical of line shapes for 20-300 GeV.