TY - JOUR
T1 - Intergalactic magnetic field spectra from diffuse gamma-rays
AU - Chen, Wenlei
AU - Chowdhury, Borun D.
AU - Ferrer, Francesc
AU - Tashiro, Hiroyuki
AU - Vachaspati, Tanmay
N1 - Publisher Copyright:
© 2015 The Author.
PY - 2015/4/24
Y1 - 2015/4/24
N2 - Non-vanishing parity-odd correlators of gamma-ray arrival directions observed by Fermi-LAT indicate the existence of a helical intergalactic magnetic field with strength B ~ 10-14 G on ~10 Mpc scales. 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. With some further technical assumptions, we show how to reconstruct the magnetic helicity spectrum from the parity-odd correlators.
AB - Non-vanishing parity-odd correlators of gamma-ray arrival directions observed by Fermi-LAT indicate the existence of a helical intergalactic magnetic field with strength B ~ 10-14 G on ~10 Mpc scales. 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. With some further technical assumptions, we show how to reconstruct the magnetic helicity spectrum from the parity-odd correlators.
KW - Cosmology: observations
KW - Early universe
KW - Gamma-rays: diffuse background
UR - https://www.scopus.com/pages/publications/84938057801
U2 - 10.1093/mnras/stv308
DO - 10.1093/mnras/stv308
M3 - Article
AN - SCOPUS:84938057801
SN - 0035-8711
VL - 450
SP - 3371
EP - 3380
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -