Intergalactic magnetic field spectra from diffuse gamma rays
Wenlei Chen, Borun D. Chowdhury, Francesc Ferrer, Hiroyuki Tashiro and, Tanmay Vachaspati
TL;DR
This paper investigates the existence and properties of a helical intergalactic magnetic field by analyzing gamma-ray data, confirming previous hypotheses and proposing a method to reconstruct the magnetic helicity spectrum.
Contribution
The study provides a more rigorous test of the helical magnetic field hypothesis using enhanced data analysis techniques and introduces a method to reconstruct the magnetic helicity spectrum from gamma-ray observations.
Findings
Confirmation of parity-odd correlators indicating a helical magnetic field.
Validation of previous predictions with improved data analysis.
Proposal of a method to reconstruct magnetic helicity spectrum.
Abstract
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.
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