Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.256..281t&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 256, no. 2, May 15, 1992, p. 281-290.
Astronomy and Astrophysics
Astronomy
29
Active Galaxies, Depolarization, Radio Jets (Astronomy), Radio Sources (Astronomy), Astronomical Polarimetry, Polarization (Waves), Relativistic Plasmas
Scientific paper
Depolarization of the counterjet side and other asymmetries in double radio sources are considered in detail. The polarization curves of a small sample are shown to be consistent with the expected behavior of a source behind a partially resolved foreground screen. The depolarization asymmetry is modeled, and the way in which the orientation angles of the sources can be found is shown. Depolarization is only correlated with arm-length for sources close to the plane of the sky, such as radio galaxies. It is shown that the recently observed spectral index asymmetry can also be interpreted as an orientation effect if the hotspots advance at speeds of 0.2 c. This supports the idea that double sources are intrinsically two-sided and that the depolarization and spectral asymmetries are primarily due to orientation. High flow velocities in the hotspots provide a natural explanation for the compactness asymmetry, and imply a spectral index asymmetry for the hotspots themselves.
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