Parity-odd correlators of diffuse gamma rays and intergalactic magnetic fields

Abstract

We develop the connection between intergalactic helical magnetic fields and parity odd signatures in the diffuse gamma ray sky. We find that the location and the amplitude of a peak in a parity odd correlator, $Q(R)$, can be used to infer the normal and helical power spectra of the intergalactic magnetic field. When applied to Fermi-LAT data, the amplitude of the observed peak in $Q(R)$ gives $\sim 10^{-14}\mathrm{G}$ intergalactic magnetic field strength, which is consistent with an earlier independent estimate that only used the peak location (Tashiro et al. 2014). We discuss features in the observed $Q(R)$ that further support the intergalactic magnetic field hypothesis and make predictions for future tests.

10 pages, 4 figures

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Cited by in corpus (21)

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• Progress on Cosmological Magnetic Fields
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• Evolution of the Baryon Asymmetry through the Electroweak Crossover in the Presence of a Helical Magnetic Field
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• Magnetic Helicity from Multipolar Regions on the Solar Surface
• Magnetic Field Transfer From A Hidden Sector
• Searching for primordial helical magnetic fields