| タイトル | Constraints on the Galactic Halo Dark Matter from Fermi-LAT Diffuse Measurements |
| 本文（外部サイト） | http://hdl.handle.net/2060/20140005254 |
| 著者（英） | McEnery, Julie E.; Bruel, P.; Buson, S.; Baldini, L.; Cuoco, A.; Borgland, A. W.; Chiang, J.; Brandt, Theresa J.; Bregeon, J.; Bloom, E. D.; Caliandro, G. A.; Cecchi, C.; Cameron, R. A.; Ciprini, S.; Bellazzini, R.; Cohen-Tanugi, J.; Atwood, W. B.; Scargle. J. D.; Blandford, R. D.; Casandjian, J. M.; Bottacini, E.; Conrad, J.; Bonamente, E.; Buehler, R.; Troja, Eleonora; Barbiellini, G.; Guiriec, Sylvain Germain; Brigida, M.; Bechtol, K.; Caraveo, P A.; Bastieri, D.; Chekhtman, A.; Claus, R.; Ackermann, M.; Ajello, M. |
| 発行日 | 2012-12-20 |
| 言語 | eng |
| 内容記述 | We have performed an analysis of the diffuse gamma-ray emission with the Fermi Large Area Telescope (LAT) in
the Milky Way halo region, searching for a signal from dark matter annihilation or decay. In the absence of a robust
dark matter signal, constraints are presented. We consider both gamma rays produced directly in the dark matter
annihilation/decay and produced by inverse Compton scattering of the e+/e produced in the annihilation/decay.
Conservative limits are derived requiring that the dark matter signal does not exceed the observed diffuse gamma-ray
emission. A second set of more stringent limits is derived based on modeling the foreground astrophysical diffuse
emission using the GALPROP code. Uncertainties in the height of the diffusive cosmic-ray halo, the distribution
of the cosmic-ray sources in the Galaxy, the index of the injection cosmic-ray electron spectrum, and the column
density of the interstellar gas are taken into account using a profile likelihood formalism, while the parameters
governing the cosmic-ray propagation have been derived from fits to local cosmic-ray data. The resulting limits
impact the range of particle masses over which dark matter thermal production in the early universe is possible, and
challenge the interpretation of the PAMELA/Fermi-LAT cosmic ray anomalies as the annihilation of dark matter. |
| NASA分類 | Astrophysics |
| レポートNO | GSFC-E-DAA-TN8468 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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