Intergalactic magnetic field spectra from diffuse gamma rays
Cosmology and Nongalactic Astrophysics
2015-05-27 v1 High Energy Astrophysical Phenomena
High Energy Physics - Phenomenology
High Energy Physics - Theory
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.
Cite
@article{arxiv.1412.3171,
title = {Intergalactic magnetic field spectra from diffuse gamma rays},
author = {Wenlei Chen and Borun D. Chowdhury and Francesc Ferrer and Hiroyuki Tashiro and Tanmay Vachaspati},
journal= {arXiv preprint arXiv:1412.3171},
year = {2015}
}
Comments
12 pages, 8 figures