Depolarization asymmetry in the quasar 3C 47

Details Depolarization asymmetry in the quasar 3C 47 Depolarization asymmetry in the quasar 3C 47

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...381...63f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 381, Nov. 1, 1991, p. 63-71.

Astronomy and Astrophysics

Astronomy

21

Astronomical Polarimetry, Quasars, Radio Jets (Astronomy), Depolarization, Extragalactic Radio Sources, Radio Astronomy

Scientific paper

It has been reported recently that in many extended high-luminosity extragalactic radio sources, the lobe on the jet side shows less depolarization than the lobe on the counterjet side. This depolarization asymmetry has been interpreted as being produced by an external foreground screen. The one-sided jet quasar 3C 47 was observed with the VLA at 6 and 20 cm. Maps of the projected magnetic field, depolarization, and rotation measure have been derived. Significant differences for these parameters have been found among the various components of the source. In particular, 3C 47 shows a strong depolarization asymmetry between the NE (counterjet side) and the SW (jet side). The distribution of the depolarization ratio is quite uniform in each lobe, but quite asymmetric between the two lobes. This is likely to be a signature of a foreground screen. The consequences of this model for the relativistic beaming hypothesis are also explored.

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