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Title: Angular power spectrum of the diffuse gamma-ray emission as measured by the Fermi Large Area Telescope and constraints on its dark matter interpretation

Journal Article · · Physical Review D
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [1];  [10]
  1. Univ. of Amsterdam (Netherlands)
  2. RWTH Aachen Univ. (Germany). Inst. for Theoretical Particle Physics and Cosmology (TTK)
  3. Univ. of Copenhagen (Denmark). The Niels Bohr Inst.; Univ. of Iceland, Reykjavik (Iceland). Center for Astrophysics and Cosmology
  4. Univ. of Amsterdam (Netherlands); California Inst. of Technology (CalTech), Pasadena, CA (United States)
  5. Oskar Klein Centre for Cosmoparticle Physics, Stockholm (Sweden); Stockholm Univ. (Sweden). Dept. of of Physics
  6. Catholic Univ. of Chile, Santiago (Chile). Inst. of Astrophysics
  7. Max Planck Inst. for Astrophysics, Muchen (Germany); Univ. of Tokyo (Japan). Kavli Inst. for the Physics and Mathematics of the Universe
  8. Univ. of Chicago, IL (United States). Kavli Inst. for Cos; The Ohio State Univ., Columbus, OH (United States). Center for Cosmology and AstroParticle Physics (CCAPP)
  9. Autonomous Univ. of Madrid (Spain). Inst. of Theoretical Physics; Campus of International Excellence UAM+CSIC, Madrid (Spain); Inst. of Astrophysics in Andalucia (IAA0CSIC), Granada (Spain)
  10. National Inst. of Nuclear Physics, Rome (Italy)
+ Show Author Affiliations

The isotropic gamma-ray background arises from the contribution of unresolved sources, including members of confirmed source classes and proposed gamma-ray emitters such as the radiation induced by dark matter annihilation and decay. Clues about the properties of the contributing sources are imprinted in the anisotropy characteristics of the gamma-ray background. We use 81 months of Pass 7 Reprocessed data from the Fermi Large Area Telescope to perform a measurement of the anisotropy angular power spectrum of the gamma-ray background. Here, we analyze energies between 0.5 and 500 GeV, extending the range considered in the previous measurement based on 22 months of data. We also compute, for the first time, the cross-correlation angular power spectrum between different energy bins. The derived angular spectra are compatible with being Poissonian, i.e. constant in multipole. Furthermore, the energy dependence of the anisotropy suggests that the signal is due to two populations of sources, contributing, respectively, below and above ~ 2 GeV . Finally, using data from state-of-the-art numerical simulations to model the dark matter distribution, we constrain the contribution from dark matter annihilation and decay in Galactic and extra-Galactic structures to the measured anisotropy. These constraints are competitive with those that can be derived from the average intensity of the isotropic gamma-ray background.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515; PIIF-GA-2013-62772; PF1-120089; FPA2012-34694; SEV-2012-0249; AYA2014-60641-C2-1-P; PIIF-GA-2013-628997
OSTI ID:
1355717
Alternate ID(s):
OSTI ID: 1335057
Journal Information:
Physical Review D, Vol. 94, Issue 12; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 42 works
Citation information provided by
Web of Science

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Cited By (17)

WIMP dark matter candidates and searches—current status and future prospects journal May 2018
Extragalactic diffuse γ-rays from dark matter annihilation: revised prediction and full modelling uncertainties journal February 2018
Gamma-Ray Polarimetry: A New Window for the Nonthermal Universe journal September 2019
Realistic estimation for the detectability of dark matter subhalos using Fermi-LAT catalogs journal September 2017
Modeling evolution of dark matter substructure and annihilation boost journal June 2018
Search for Cosmic-Ray Electron and Positron Anisotropies with Seven Years of Fermi Large Area Telescope Data journal March 2017
A Search for Cosmic-Ray Proton Anisotropy with the Fermi Large Area Telescope journal September 2019
Modeling evolution of dark matter substructure and annihilation boost journal February 2020
Extragalactic diffuse γ-rays from dark matter annihilation: revised prediction and full modelling uncertainties text January 2018
A Search for Cosmic-Ray Proton Anisotropy with the Fermi Large Area Telescope text January 2019
A Search for Cosmic-Ray Proton Anisotropy with the Fermi Large Area Telescope collection January 2019
Unresolved Gamma-Ray Sky through its Angular Power Spectrum text January 2018
The galactic isotropic γ-ray background and implications for dark matter journal June 2018
WIMP dark matter candidates and searches - current status and future prospects text January 2017
An Updated Tomographic Analysis of the Integrated Sachs-Wolfe Effect and implications for Dark Energy text January 2017
Gamma Ray polarimetry; a new window for the non-thermal Universe text January 2019
Detection of cross-correlation between gravitational lensing and gamma rays text January 2019

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