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Determination of intergalactic magnetic fields from gamma ray data · Around

2010

Determination of intergalactic magnetic fields from gamma ray data

Essey, Warren, Ando, Shin'ichiro, Kusenko, Alexander

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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 in line-of-sight cosmic-ray interactions dominate the signal.
In this case, we find 0.01 fG < B < 30 fG.
If one excludes the cosmic-ray component, the 0.01 fG lower limit remains, but the upper limit depends on the spectral properties of the source.

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