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Search for GeV γ-Ray Pair Halos Around Low Redshift Blazars

Wenlei Chen, James H. Buckley, and Francesc Ferrer
Phys. Rev. Lett. 115, 211103 – Published 16 November 2015
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Abstract

We report on the results of a search for γ-ray pair halos with a stacking analysis of low redshift blazars using data from the Fermi Large Area Telescope. For this analysis we used a number of a priori selection criteria, including the spatial and spectral properties of the Fermi sources. The angular distribution of 1GeV photons around 24 stacked isolated high-synchrotron-peaked BL Lacs with redshift z<0.5 shows an excess over that of pointlike sources. A frequentist test yields a p value of p0.01 for the extended emission against the point-source hypothesis. A Bayesian estimation provides Bayes factors log10B10>2, consistent with expectations for pair halos produced in the intergalactic magnetic fields with strength BIGMF10171015G.

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  • Received 28 October 2014

DOI:https://doi.org/10.1103/PhysRevLett.115.211103

© 2015 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Wenlei Chen*, James H. Buckley, and Francesc Ferrer

  • Department of Physics and McDonnell Center for the Space Sciences, Washington University in St. Louis, St. Louis, Missouri 63130, USA

  • *wenleichen@wustl.edu

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Issue

Vol. 115, Iss. 21 — 20 November 2015

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