Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...264..421t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 264, no. 2, p. 421-427.
Astronomy and Astrophysics
Astrophysics
35
Extragalactic Radio Sources, Faraday Effect, Radio Galaxies, Radio Spectra, Intergalactic Media, Interstellar Magnetic Fields, X Rays
Scientific paper
While compact steep spectrum (CSS) type sources only comprise about 20 percent of the extragalactic radio sources in flux limited samples, they comprise a much larger fraction, about 50 percent, of the extragalactic sources found to have very high Faraday rotation measures (RMs). We review what is currently known about the CSS type sources with high RMs and present new high-resolution VLA observations of the CSS source 3C 318 at 3.6, 6, and 20 cm. These observations confirm the high RMs detected by Aizu et al. (1990) and reveal a change of sign in the RM across the source. The most likely source of the high RMs is a magnetized hot thermal gas around the radio source. The energy density of this gas and magnetic fields, however, is unlikely to be dense enough to confine the radio source. Our analysis suggests a fairly young source, less than 1 Myr old.
Inoue Makoto
Tabara Hiroto
Taylor Greg B.
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