Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...252...81l&link_type=abstract
Astrophysical Journal, Part 1, vol. 252, Jan. 1, 1982, p. 81-91.
Astronomy and Astrophysics
Astronomy
63
Faraday Effect, Galactic Clusters, Interstellar Magnetic Fields, Monte Carlo Method, Radio Sources (Astronomy), Statistical Analysis, Astronomical Models, Compton Effect, Galactic Rotation, Magnetic Flux
Scientific paper
The comparison of a reliable sample of radio source Faraday rotation measurements seen through rich clusters of galaxies, with sources seen through the outer parts of clusters and therefore having little intracluster Faraday rotation, indicates that the distribution of rotation in the former population is broadened, but only at the 80% level of statistical confidence. Employing a physical model for the intracluster medium in which the square root of magnetic field strength/turbulent cell per gas core radius number ratio equals approximately 0.07 microgauss, a Monte Carlo simulation is able to reproduce the observed broadening. An upper-limit analysis figure of less than 0.20 microgauss for the field strength/turbulent cell ratio, combined with lower limits on field strength imposed by limitations on the Compton-scattered flux, shows that intracluster magnetic fields must be tangled on scales greater than about 20 kpc.
Dennison Brian
Lawler Michael J.
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