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Intergalactic magnetic field spectra from diffuse gamma-rays
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DOI：10.1093/mnras/stv308.png)
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摘要
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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 similar to 10(-14) G on similar to 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.
Keyword:
cosmology: observations
early Universe
gamma-rays: diffuse background
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4.8
论文数:
7.0W
被引数:
25.0W
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