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For refcode 1991A&A...251..411V:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1991A&A...251..411V Research Note Magnetism in the local Virgo-centered supercluster of galaxies (radius ~ 24 Mpc) J.P. Vallee JCMT Group, Herzberg Institute of Astrophysics, National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario KlA 0R6, Canada JCMT Unit, Royal Observatory, Blackford Hill, Edinburgh, Scotland EH9 3HJ, UK Received February 20, accepted March 27, 1991 Abstract. An earlier search for the magnetic field in the local supercluster of galaxies, using the rotation measure data from background quasars and galaxies through the cluster and to its sides, had already revealed the presence of a net excess cluster rotation measure, attributable to a 1.5 micro G magnetic field in the Virgo cluster at a redshift z = 0.004, near the center of the local supercluster. A recent study of the twin warps in nearby spiral galaxies seemed to indicate an excess warping in a preferred direction, possibly attributable to an intergalactic magnetic field. Here we examine more closely the warp excess in nearby spiral galaxies, using more data now available, and its earlier interpretation in terms of a magnetic field on a distance scale out to a redshift of 0.3 (out to 1200 Mpc, for a H_0_= 75 km s^-1^ Mpc^-1^).I show that such a large scale is unwarranted, from the study of the rotation measure data as a function of redshift, that any warp excess may be rather local and spurious with a small S/N = 1.7. It implies that a local intergalactic magnetic field must be less than 50 micro G. To help studies on the local supercluster of galaxies, a Virgo- centered supercluster coordinate system is proposed, where longitude 0^deg^ goes through the center of the Virgo cluster of galaxies at the center of the local supercluster. It is essentially based on the de Vaucouleurs' system, but with the origin rotated by about 257^deg^, and it is of much use in grasping the location and possible relationships operating in the local supercluster of galaxies (within 40 Mpc). Key words: magnetic fields - galaxies: intergalactic medium - galaxies: clustering - cosmology - Universe (the): structure of
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