Stacking Fermi-LAT data from 21 blazars aligned to their jet directions detects anisotropic extended emission consistent with pair halos produced by a 2.8 x 10^{-16} G intergalactic magnetic field at 3.8 sigma.
Abramowski, et al., Search for Extended\gamma-ray Emission around AGN with H.E.S.S
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With plasma-instability cooling tuned to L≈120 kpc and α=−0.5, Fermi-LAT spectra of 1ES 0229+200 favor an IGMF lower limit B≳2.7×10^{-17} G for a 1° field of view.
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Search for Anisotropic Pair Halos Associated with Blazar Jets
Stacking Fermi-LAT data from 21 blazars aligned to their jet directions detects anisotropic extended emission consistent with pair halos produced by a 2.8 x 10^{-16} G intergalactic magnetic field at 3.8 sigma.
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The impact of plasma instability cooling on intergalactic magnetic field constraints in GeV cascades for optimized instability cooling parameters
With plasma-instability cooling tuned to L≈120 kpc and α=−0.5, Fermi-LAT spectra of 1ES 0229+200 favor an IGMF lower limit B≳2.7×10^{-17} G for a 1° field of view.