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Title: The Isotropic Radio Background and Annihilating Dark Matter

Abstract

Observations by ARCADE-2 and other telescopes sensitive to low frequency radiation have revealed the presence of an isotropic radio background with a hard spectral index. The intensity of this observed background is found to exceed the flux predicted from astrophysical sources by a factor of approximately 5-6. In this article, we consider the possibility that annihilating dark matter particles provide the primary contribution to the observed isotropic radio background through the emission of synchrotron radiation from electron and positron annihilation products. For reasonable estimates of the magnetic fields present in clusters and galaxies, we find that dark matter could potentially account for the observed radio excess, but only if it annihilates mostly to electrons and/or muons, and only if it possesses a mass in the range of approximately 5-50 GeV. For such models, the annihilation cross section required to normalize the synchrotron signal to the observed excess is sigma v ~ (0.4-30) x 10^-26 cm^3/s, similar to the value predicted for a simple thermal relic (sigma v ~ 3 x 10^-26 cm^3/s). We find that in any scenario in which dark matter annihilations are responsible for the observed excess radio emission, a significant fraction of the isotropic gamma ray backgroundmore » observed by Fermi must result from dark matter as well.« less

Authors:
 [1];  [2];  [3];  [3];  [3];  [4]
  1. Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
  2. Institut d'Astrophysique (France)
  3. Univ. of California, Santa Cruz, CA (United States)
  4. Princeton Univ., Princeton, NJ (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1155782
Report Number(s):
FERMILAB-PUB-12-072-A
Journal ID: ISSN 1550-7998; arXiv eprint number arXiv:1203.3547
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 86; Journal Issue: 10; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Hooper, Dan, Belikov, Alexander V., Jeltema, Tesla E., Linden, Tim, Profumo, Stefano, and Slatyer, Tracy R. The Isotropic Radio Background and Annihilating Dark Matter. United States: N. p., 2012. Web. doi:10.1103/PhysRevD.86.103003.
Hooper, Dan, Belikov, Alexander V., Jeltema, Tesla E., Linden, Tim, Profumo, Stefano, & Slatyer, Tracy R. The Isotropic Radio Background and Annihilating Dark Matter. United States. doi:10.1103/PhysRevD.86.103003.
Hooper, Dan, Belikov, Alexander V., Jeltema, Tesla E., Linden, Tim, Profumo, Stefano, and Slatyer, Tracy R. Thu . "The Isotropic Radio Background and Annihilating Dark Matter". United States. doi:10.1103/PhysRevD.86.103003. https://www.osti.gov/servlets/purl/1155782.
@article{osti_1155782,
title = {The Isotropic Radio Background and Annihilating Dark Matter},
author = {Hooper, Dan and Belikov, Alexander V. and Jeltema, Tesla E. and Linden, Tim and Profumo, Stefano and Slatyer, Tracy R.},
abstractNote = {Observations by ARCADE-2 and other telescopes sensitive to low frequency radiation have revealed the presence of an isotropic radio background with a hard spectral index. The intensity of this observed background is found to exceed the flux predicted from astrophysical sources by a factor of approximately 5-6. In this article, we consider the possibility that annihilating dark matter particles provide the primary contribution to the observed isotropic radio background through the emission of synchrotron radiation from electron and positron annihilation products. For reasonable estimates of the magnetic fields present in clusters and galaxies, we find that dark matter could potentially account for the observed radio excess, but only if it annihilates mostly to electrons and/or muons, and only if it possesses a mass in the range of approximately 5-50 GeV. For such models, the annihilation cross section required to normalize the synchrotron signal to the observed excess is sigma v ~ (0.4-30) x 10^-26 cm^3/s, similar to the value predicted for a simple thermal relic (sigma v ~ 3 x 10^-26 cm^3/s). We find that in any scenario in which dark matter annihilations are responsible for the observed excess radio emission, a significant fraction of the isotropic gamma ray background observed by Fermi must result from dark matter as well.},
doi = {10.1103/PhysRevD.86.103003},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
issn = {1550-7998},
number = 10,
volume = 86,
place = {United States},
year = {2012},
month = {11}
}