Physics
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..apr.b7002k&link_type=abstract
American Physical Society, April Meeting, April 29-May 2, 2000 Long Beach, CA, abstract #B7.002
Physics
Scientific paper
In this talk I describe observational tests for diffuse magnetic fields in intergalactic space. Most of the methods involve the detection of diffuse X-ray emission and/or radio synchrotron radiation and Faraday rotation of polarized cosmic radio emission. Most recent data reveal the existence of unanticipated, strong magnetic fields in some regions of intergalactic space, such as in regions of enhanced galaxy density. I show some recent pertinent observations. I also discuss some theoretical models whose parameters can be based on recent observational data. These show how galaxy systems are able to permeate the intergalactic medium around them with strong magnetic fields that accompany the poduction of cosmic rays and outlfow gas. I shall argue that stars and galaxies of our present universe are sufficient to seed and generate most, perhaps all of the magnetic fields that permeate intergalactic space. This includes some fast acting regenerating mechanisms that operate during the periods of cosmic ray gas outflow from galactic sites. I also briefly comment on the ultimate energy sources for these fields.
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