Constraints on Cosmological Dark Matter Annihilation from the Fermi-LAT Isotropic Diffuse Gamma-Ray Measurement
Abstract
The first published Fermi large area telescope (Fermi-LAT) measurement of the isotropic diffuse gamma-ray emission is in good agreement with a single power law, and is not showing any signature of a dominant contribution from dark matter sources in the energy range from 20 to 100 GeV. We use the absolute size and spectral shape of this measured flux to derive cross section limits on three types of generic dark matter candidates: annihilating into quarks, charged leptons and monochromatic photons. Predicted gamma-ray fluxes from annihilating dark matter are strongly affected by the underlying distribution of dark matter, and by using different available results of matter structure formation we assess these uncertainties. We also quantify how the dark matter constraints depend on the assumed conventional backgrounds and on the Universe's transparency to high-energy gamma-rays. In reasonable background and dark matter structure scenarios (but not in all scenarios we consider) it is possible to exclude models proposed to explain the excess of electrons and positrons measured by the Fermi-LAT and PAMELA experiments. Derived limits also start to probe cross sections expected from thermally produced relics (e.g. in minimal supersymmetry models) annihilating predominantly into quarks. For the monochromatic gamma-ray signature, the current measurement constrains only dark matter scenarios with very strong signals.
Keywords
Cite
@article{arxiv.1002.4415,
title = {Constraints on Cosmological Dark Matter Annihilation from the Fermi-LAT Isotropic Diffuse Gamma-Ray Measurement},
author = {LAT collaboration and A. A. Abdo and M. Ackermann and M. Ajello and L. Baldini and J. Ballet and G. Barbiellini and D. Bastieri and K. Bechtol and R. Bellazzini and B. Berenji and R. D. Blandford and E. D. Bloom and E. Bonamente and A. W. Borgland and A. Bouvier and J. Bregeon and A. Brez and M. Brigida and P. Bruel and T. H. Burnett and S. Buson and G. A. Caliandro and R. A. Cameron and P. A. Caraveo and S. Carrigan and J. M. Casandjian and C. Cecchi and O. C. Elik and A. Chekhtman and C. C. Cheung and J. Chiang and S. Ciprini and R. Claus and J. Cohen-Tanugi and J. Conrad and S. Cutini and C. D. Dermer and A. de Angelis and F. de Palma and S. W. Digel and E. do Couto e Silva and P. S. Drell and R. Dubois and D. Dumora and Y. Edmonds and C. Farnier and C. Favuzzi and S. J. Fegan and W. B. Focke and P. Fortin and M. Frailis and Y. Fukazawa and P. Fusco and F. Gargano and D. Gasparrini and N. Gehrels and S. Germani and N. Giglietto and F. Giordano and T. Glanzman and G. Godfrey and J. E. Grove and L. Guillemot and S. Guiriec and M. Gustafsson and D. Hadasch and A. K. Harding and D. Horan and R. E. Hughes and A. S. Johnson and W. N. Johnson and T. Kamae and H. Katagiri and J. Kataoka and N. Kawai and M. Kerr and J. Knodlseder and M. Kuss and J. Lande and L. Latronico and M. Llena Garde and F. Longo and F. Loparco and B. Lott and M. N. Lovellette and P. Lubrano and A. Makeev and M. N. Mazziotta and J. E. McEnery and C. Meurer and P. F. Michelson and W. Mitthumsiri and T. Mizuno and C. Monte and M. E. Monzani and A. Morselli and I. V. Moskalenko and S. Murgia and P. L. Nolan and J. P. Norris and E. Nuss and T. Ohsugi and N. Omodei and E. Orlando and J. F. Ormes and D. Paneque and J. H. Panetta and D. Parent and V. Pelassa and M. Pepe and M. Pesce-Rollins and F. Piron and S. Raino and R. Rando and A. Reimer and O. Reimer and T. Reposeur and A. Y. Rodriguez and M. Roth and H. F. W. Sadrozinski and A. Sander and P. M. Saz Parkinson and J. D. Scargle and A. Sellerholm and C. Sgro and E. J. Siskind and P. D. Smith and G. Spandre and P. Spinelli and J. L. Starck and M. S. Strickman and D. J. Suson and H. Takahashi and T. Tanaka and J. B. Thayer and J. G. Thayer and D. F. Torres and Y. Uchiyama and T. L. Usher and V. Vasileiou and N. Vilchez and V. Vitale and A. P. Waite and P. Wang and B. L. Winer and K. S. Wood and T. Ylinen and G. Zaharijas and M. Ziegle},
journal= {arXiv preprint arXiv:1002.4415},
year = {2015}
}
Comments
29 pages, 7 figures, to be published in JCAP. Corresponding authors: Jan Conrad, Michael Gustafsson, Alexander Sellerholm, Gabrijela Zaharijas