Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...360....1v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 360, Sept. 1, 1990, p. 1-6.
Astronomy and Astrophysics
Astronomy
62
Galactic Clusters, Galactic Evolution, Intergalactic Media, Interstellar Magnetic Fields, Dynamo Theory, Galactic Rotation, Magnetic Flux, Quasars, Sky Surveys (Astronomy), Spiral Galaxies
Scientific paper
Recently, a large sample of rotation measures of galaxies and quasars at various redshifts has been published. This data set is used to test for the existence of an uniform component of a cosmic/intergalactic magnetic field outside clusters of galaxies. From a total of 309 galaxies and quasars with a known redshift and a small intrinsic rotation measure value, an upper limit of about 2 rad/sq m is obtained for such a cosmic/intergalactic contribution out to a redshift z of 3.6. From this result, and a mean density of 0.00001/cu cm, an upper limit of 6 x 10 to the -12th G follows for the strength of such a cosmic/intergalactic magnetic field outside clusters of galaxies, or an upper limit of 6 x 10 to the -11th G for a mean density of 10 to the -6th/cu cm.
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