New limits on extragalactic magnetic fields from rotation measures

Abstract

We take advantage of the wealth of rotation measures data contained in the NRAO VLA Sky Survey catalogue to derive new, statistically robust, upper limits on the strength of extragalactic magnetic fields. We simulate the extragalactic magnetic field contribution to the rotation measures for a given field strength and correlation length, by assuming that the electron density follows the distribution of Lyman-$\alpha$ clouds. Based on the observation that rotation measures from distant radio sources do not exhibit any trend with redshift, while the extragalactic contribution instead grows with distance, we constrain fields with Jeans' length coherence length to be below 1.7~nG at the $2\sigma$ level, and fields coherent across the entire observable Universe below 0.65~nG. These limits do not depend on the particular origin of these cosmological fields.

5 pages, 3 figures -- v2 to match PRL version

References in corpus (3)

• Estimating extragalactic Faraday rotation
• A Global Probe of Cosmic Magnetic Fields to High Redshifts
• On the amplification of magnetic fields in cosmic filaments and galaxy clusters

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