Detection of Large-Scale Cosmic Magnetic Fields

Details Detection of Large-Scale Cosmic Magnetic Fields Detection of Large-Scale Cosmic Magnetic Fields

2009-06-09

arxiv.org/abs/0906.1631v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

This paper has been withdrawn by the author because the measured cross-correlation signals have been found to be spurious afte

Scientific paper

Observational evidence for the existence of cosmic magnetic fields in intergalactic space coherent over Mpc scales is presented. Using an unprecedentedly large sample of Faraday rotation measures of radio sources from the NRAO VLA Sky Survey data and the photometric redshift galaxy catalog from the sixth Data Release of the Sloan Digital Sky Survey (SDSS), we measure the cross-correlations between the rotation measures and the galaxy density field distributed along the source sightlines. It is shown that the rotation measures for sightlines passing through high density regions at separation r >= 1 Mpc/h from the locations of background radio sources are significantly enhanced. We discuss possible generators of this enhancement and interpret it to be intergalactic magnetic fields coherent over 1 Mpc/h with mean field strength B~30 nG.

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