A model-independent analysis of the Fermi Large Area Telescope gamma-ray data from the Milky Way dwarf galaxies and halo to constrain dark matter scenarios

Mazziotta, M. N.; Loparco, F.; de Palma, F.; Giglietto, N.

doi:10.1016/j.astropartphys.2012.07.005

A model-independent analysis of the Fermi Large Area Telescope gamma-ray data from the Milky Way dwarf galaxies and halo to constrain dark matter scenarios

Journal Article · Sun Jul 22 00:00:00 EDT 2012 · Astroparticle Physics

DOI:https://doi.org/10.1016/j.astropartphys.2012.07.005· OSTI ID:1356669

Mazziotta, M. N. ^[1]; Loparco, F. ^[2]; de Palma, F. ^[1]; Giglietto, N. ^[2]

National Inst. of Nuclear Physics, Bari (Italy)
National Inst. of Nuclear Physics and, Bari (Italy)

Here, we implemented a novel technique to perform the collective spectral analysis of sets of multiple gamma-ray point sources using the data collected by the Large Area Telescope onboard the Fermi satellite. The energy spectra of the sources are reconstructed starting from the photon counts and without assuming any spectral model for both the sources and the background. In case of faint sources, upper limits on their fluxes are evaluated with a Bayesian approach. Our analysis technique is very useful when several sources with similar spectral features are studied, such as sources of gamma rays from annihilation of dark matter particles. We also present the results obtained by applying this analysis to a sample of dwarf spheroidal galaxies and to the Milky Way dark matter halo. The analysis of dwarf spheroidal galaxies yields upper limits on the product of the dark matter pair annihilation cross section and the relative velocity of annihilating particles that are well below those predicted by the canonical thermal relic scenario in a mass range from a few GeV to a few tens of GeV for some annihilation channels.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE

Contributing Organization:: Fermi LAT Collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1356669

Journal Information:: Astroparticle Physics, Journal Name: Astroparticle Physics Journal Issue: C Vol. 37; ISSN 0927-6505

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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A model-independent analysis of the Fermi Large Area Telescope gamma-ray data from the Milky Way dwarf galaxies and halo to constrain dark matter scenarios

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