Characterization of dark-matter-induced anisotropies in the diffuse gamma-ray background

被引：48

作者：

Fornasa, Mattia ^{[1
,2
]}

Zavala, Jesus ^{[3
,4
]}

Sanchez-Conde, Miguel A. ^{[5
,6
]}

Siegal-Gaskins, Jennifer M. ^{[7
]}

Delahaye, Timur ^{[8
]}

Prada, Francisco ^{[1
,8
,9
]}

Vogelsberger, Mark ^{[10
]}

Zandanel, Fabio ^{[1
]}

Frenk, Carlos S. ^{[11
]}

机构：

[1] Inst Astrofis Andalucia IAA CSIC, Granada, Spain

[2] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England

[3] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada

[4] Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5, Canada

[5] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[6] Kavli Inst Particle Astrophys & Cosmol, Menlo Pk, CA 94025 USA

[7] CALTECH, Pasadena, CA 91125 USA

[8] Univ Autonoma Madrid Cantoblanco, Inst Fis Teor, UAM CSIC, E-28049 Madrid, Spain

[9] UAM CSIC, E-28049 Madrid, Spain

[10] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[11] Univ Durham, Inst Computat Cosmol, Dept Phys, Durham DM1 3LE, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2013年 / 429卷 / 02期

关键词：

astroparticle physics; methods: numerical; cosmology: dark matter; gamma-rays: diffuse background; STAR-FORMING GALAXIES; LARGE-SCALE STRUCTURE; RADIO GALAXIES; FERMI-LAT; POWER SPECTRUM; RADIATION; ANNIHILATION; DENSITY; STATISTICS; PREDICTIONS;

D O I：

10.1093/mnras/sts444

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Fermi-LAT collaboration has recently reported the detection of angular power above the photon noise level in the diffuse gamma-ray background between 1 and 50 GeV. Such signal can be used to constrain a possible contribution from dark matter (DM) induced photons. We estimate the intensity and features of the angular power spectrum (APS) of this potential DM signal, for both decaying and annihilating DM candidates, by constructing template all-sky gamma-ray maps for the emission produced in the galactic halo and its substructures, as well as in extragalactic (sub)haloes. The DM distribution is given by state-of-the-art N-body simulations of cosmic structure formation, namely Millennium-II for extragalactic (sub)haloes, and Aquarius for the galactic halo and its subhaloes. We use a hybrid method of extrapolation to account for (sub)structures that are below the resolution limit of the simulations, allowing us to estimate the total emission all the way down to the minimal self-bound halo mass. We describe in detail the features appearing in the APS of our template maps and we estimate the effect of various uncertainties such as the value of the minimal halo mass, the fraction of substructures hosted in a halo and the shape of the DM density profile. Our results indicate that the fluctuation APS of the DM-induced emission is of the same order as the Fermi-LAT APS, suggesting that one can constrain this hypothetical emission from the comparison with the measured anisotropy. We also quantify the uncertainties affecting our results, finding 'theoretical error bands' spanning more than two orders of magnitude and dominated (for a given particle physics model) by our lack of knowledge of the abundance of low-mass (sub)haloes.

引用

页码：1529 / 1553

页数：25

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