Intergalactic magnetic field and the distance of quasars from Faraday rotation

Physics

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Scientific paper

In 1968 Sofue, Fujimoto and Kawabata and, later, Reinhardt and Thiel, showed that the amount of Faraday rotation measured for quasars is related to their distance from the observer. Such measures then become the only existing method to directly measure distances of quasars. It is shown here that the observed Faraday rotation as a function of redshift excludes the possibility that quasars are at distances proportional to their redshifts. Systematically larger Faraday rotations are observed for quasars with redshifts z ~ 1. The strongest concentration of z ~ 1 quasars is in an area of the sky ~40° in diameter centered on the Virgo Cluster. The fact that these Faraday rotations are of the same sign demonstrates the existence of an ordered magnetic field throughout a large volume of intergalactic space in the direction toward the Local Supercluster. Quasars with z ~ 2.0 and z ~ 0.5 do not show such Faraday rotations and are confirmed to be at a closer distance. The organized magnetic field discovered in the space around the Virgo Cluster is 3 orders of magnitude larger than any previously known.

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