Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.211103
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Funding
- U.S. Department of Energy [DE-FG02-91ER40628]
- Department of Physics, Washington University in St. Louis (WUSTL)
- U.S. Department of Energy (DOE) [DE-FG02-91ER40628] Funding Source: U.S. Department of Energy (DOE)
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We report on the results of a search for gamma-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 similar to 1 GeV 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 p similar to 0.01 for the extended emission against the point-source hypothesis. A Bayesian estimation provides Bayes factors log(10) B-10 > 2, consistent with expectations for pair halos produced in the intergalactic magnetic fields with strength B-IGMF similar to 10(-17)-10(-15) G.
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