Anisotropies in the diffuse gamma-ray background from dark matter with Fermi LAT: A closer look

Cuoco, A.; Sellerholm, A.; Conrad, J.; Hannestad, S.

doi:10.1111/j.1365-2966.2011.18525.x

Title: Anisotropies in the diffuse gamma-ray background from dark matter with Fermi LAT: A closer look

Journal Article · Tue Jun 21 00:00:00 EDT 2011 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1111/j.1365-2966.2011.18525.x· OSTI ID:1357229

Cuoco, A. ^[1]; Sellerholm, A. ^[2]; Conrad, J. ^[2]; Hannestad, S. ^[3]

The Oskar Klein Centre for Cosmo Particle Physics, Stockholm (Sweden); Univ. of Aarhus, Aarhus (Denmark)
The Oskar Klein Centre for Cosmo Particle Physics, Stockholm (Sweden)
Univ. of Aarhus, Aarhus (Denmark)

We perform a detailed study of the sensitivity to the anisotropies related to dark matter (DM) annihilation in the isotropic gamma-ray background (IGRB) as measured by the Fermi Large Area Telescope (Fermi LAT). For the first time, we take into account the effects of the Galactic foregrounds and use a realistic representation of the Fermi LAT. We implement an analysis pipeline which simulates Fermi LAT data sets starting from model maps of the Galactic foregrounds, the Fermi-resolved point sources, the extragalactic diffuse emission and the signal from DM annihilation. The effects of the detector are taken into account by convolving the model maps with the Fermi LAT instrumental response. We then use the angular power spectrum to characterize the anisotropy properties of the simulated data and to study the sensitivity to DM. We consider DM anisotropies of extragalactic origin and of Galactic origin (which can be generated through annihilation in the Milky Way substructures) as opposed to a background of anisotropies generated by sources of astrophysical origin, blazars for example. We find that with statistics from 5 yr of observation, Fermi is sensitive to a DM contribution at the level of 1–10 per cent of the measured IGRB depending on the DM mass m_χ and annihilation mode. In terms of the thermally averaged cross-section <σAv>, this corresponds to ~10^–25 cm³ s^–1, i.e. slightly above the typical expectations for a thermal relic, for low values of the DM mass m_χ≲ 100 GeV. As a result, the anisotropy method for DM searches has a sensitivity comparable to the usual methods based only on the energy spectrum and thus constitutes an independent and complementary piece of information in the DM puzzle.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1357229

Journal Information:: Monthly Notices of the Royal Astronomical Society, Vol. 414, Issue 3; ISSN 0035-8711

Publisher:: Royal Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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