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Determination of intergalactic magnetic fields from gamma ray data

Essey, Warren and Ando, Shin'ichiro and Kusenko, Alexander (2011) Determination of intergalactic magnetic fields from gamma ray data. Astroparticle Physics, 35 (3). pp. 135-139. ISSN 0927-6505.

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We report a measurement of intergalactic magnetic fields using combined data from Atmospheric Cherenkov Telescopes and Fermi Gamma-Ray Space Telescope, based on the spectral data alone. If blazars are assumed to produce both gamma rays and cosmic rays, the observed spectra are not sensitive to the intrinsic spectrum of the source, because, for a distant blazar, secondary photons produced along the line of sight dominate the signal. In this case, we set a limit 1 x 10^(-17) G < B < 3 x 10^(-14) G. If one excludes the cosmic-ray component, the 10^(-17) G lower limit remains, but the upper limit depends on the spectral properties of the source. We present the allowed ranges for a variety of model parameters.

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Additional Information:© 2011 Elsevier B.V. Received 1 April 2011; revised 15 June 2011; Accepted 21 June 2011. Available online 1 July 2011. The authors thank F. Aharonian, J. Beacom, P. Blasi, C. Dermer, S. Razzaque, and E. Waxman for helpful comments. The work of W.E. and A.K. was supported by DOE grant DE-FG03-91ER40662 and NASA ATP grant NNX08AL48G. The work of S.A. was supported by Japan Society for Promotion of Science.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG03-91ER40662
Japan Society for the Promotion of ScienceUNSPECIFIED
Subject Keywords:Gamma rays; Cosmic rays; Intergalactic magnetic fields
Issue or Number:3
Record Number:CaltechAUTHORS:20111206-114000364
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Official Citation:Warren Essey, Shin’ichiro Ando, Alexander Kusenko, Determination of intergalactic magnetic fields from gamma ray data, Astroparticle Physics, Volume 35, Issue 3, October 2011, Pages 135-139, ISSN 0927-6505, 10.1016/j.astropartphys.2011.06.010. (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28318
Deposited By: Ruth Sustaita
Deposited On:06 Dec 2011 20:46
Last Modified:03 Oct 2019 03:31

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