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

被引：41
|
作者：
Mazziotta, M. N. [1 ]
Loparco, F. [1 ,2 ,3 ]
de Palma, F. [1 ]
Giglietto, N. [1 ,2 ,3 ]
机构：
[1] Ist Nazl Fis Nucl, Sez Bari, I-70125 Bari, Italy
[2] Univ Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy
[3] Politecn Bari, I-70126 Bari, Italy
来源：
ASTROPARTICLE PHYSICS | 2012年 / 37卷
关键词：
DM searches; DSph galaxies; Milky Way halo; Bayesian confidence intervals; Stacking analysis; DENSITY;
D O I：
10.1016/j.astropartphys.2012.07.005
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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. This 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 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. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：26 / 39
页数：14
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