Intergalactic magnetic field spectra from diffuse gamma-rays

Wenlei Chen; Borun D. Chowdhury; Francesc Ferrer; Hiroyuki Tashiro; Tanmay Vachaspati

doi:10.1093/mnras/stv308

Intergalactic magnetic field spectra from diffuse gamma-rays

Wenlei Chen, Borun D. Chowdhury, Francesc Ferrer, Hiroyuki Tashiro, Tanmay Vachaspati

Research output: Contribution to journal › Article › peer-review

40 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	3371-3380
Number of pages	10
Journal	Monthly Notices of the Royal Astronomical Society
Volume	450
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stv308
State	Published - Apr 24 2015
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2015 The Author.

Keywords

Cosmology: observations
Early universe
Gamma-rays: diffuse background

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10.1093/mnras/stv308

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abstract = "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.",

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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

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

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Intergalactic magnetic field spectra from diffuse gamma-rays

Abstract

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