Please use this identifier to cite or link to this item: http://hdl.handle.net/2307/230
Title: Anisotropy probe of galactic and extra-galactic dark matter annihilations
Authors: Fornasa, Mattia
Pieri, Lidia
Bertone, Gianfranco
Branchini, Enzo
Keywords: CONTINUUM GAMMA-RAYS
MILKY-WAY HALO
POWER SPECTRUM
SUBSTRUCTURE
EVOLUTION
EMISSION
Issue Date: Jul-2009
Publisher: American Physical Society
Abstract: We study the flux and the angular power spectrum of gamma rays produced by dark matter (DM) annihilations in the Milky Way (MW) and in extra-galactic halos. The annihilation signal receives contributions from: (a) the smooth MW halo, (b) resolved and unresolved substructures in the MW, (c) external DM halos at all redshifts, including (d) their substructures. Adopting a self-consistent description of local and extra-galactic substructures, we compute the angular power spectrum of gamma-ray anisotropies and show that, quite independently from the prescription used for the concentration parameters c(M,z), an interesting signature of DM annihilations could soon be discovered by the Fermi LAT satellite at low multipoles, l similar to 100, assuming a particle physics scenario that does not violate gamma-ray constraints from the Galactic center. The DM contribution to the angular power spectrum is dominated by MW substructures (with mass M >= 10(4)M(circledot)), while, at least for the substructures' models that we have adopted, the contribution of extra-galactic annihilations is negligible at all scales. MW subhalos also dominate the annihilation flux in themajority of the sky, with the smooth galactic halo being brighter only in the very central region.
URI: http://hdl.handle.net/2307/230
ISSN: 1550-7998
DOI: 10.1103/PhysRevD.80.023518
metadata.dc.identifier.url: http://arxiv.org/abs/0901.2921
Appears in Collections:A - Articolo su rivista
X_Dipartimento di Fisica 'Edoardo Amaldi'

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