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Intergalactic magnetic field spectra from diffuse gamma rays

Non-vanishing parity-odd correlators of gamma ray arrival directions observed by Fermi-LAT indicate the existence of a helical intergalactic magnetic field (Tashiro et al.2013). We successfully test this hypothesis using more stringent cuts of the data, Monte Carlo simulations with Fermi-LAT time exposure information, separate analyses for the northern and southern galactic hemispheres, and confirm predictions made in Tashiro & Vachaspati (2014). With some further technical assumptions, we show how to reconstruct the magnetic helicity spectrum from the parity-odd correlators.

preprint2014arXivOpen access
Wenlei ChenBorun D. ChowdhuryFrancesc FerrerHiroyuki TashiroTanmay Vachaspati
astro-ph.COhep-phastro-ph.HEhep-th
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Wenlei ChenBorun D. ChowdhuryFrancesc FerrerHiroyuki TashiroTanmay Vachaspati

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