Astronomy and Astrophysics – Astronomy
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.250..198g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 250, May 1, 1991, p. 198-208.
Astronomy and Astrophysics
Astronomy
121
Depolarization, Extragalactic Radio Sources, Radio Jets (Astronomy), Asymmetry, Halos, Interstellar Gas, Magnetic Flux, Red Shift, X Ray Sources
Scientific paper
The asymmetry seen in powerful double radio sources with one-sided jets where the depolarization is systematically stronger on the counterjet side is discussed. The possibility of depolarization by thermal gas within the radio lobes is considered, as is external depolarization. It is concluded that the major contribution to depolarization arises in an external halo of ionized gas, which is identified here with the extended X-ray emission often found in clusters. The jet asymmetry is interpreted as relativistic beaming of the jet emission. The depolarization asymmetry is a simple geometric effect, the counterjet side being seen through a longer path length of gas with greater density. A simple model of such a halo is investigated.
Conway R. G.
Garrington Simon T.
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