Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274l..19a&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 274, Nov. 1, 1983, p. L19-L22.
Astronomy and Astrophysics
Astronomy
13
Bl Lacertae Objects, Polarized Electromagnetic Radiation, Radio Bursts, Radio Sources (Astronomy), Faraday Effect, Flux Density, Variability
Scientific paper
During the series of radio bursts in BL Lacertae which started in late 1979, the polarization exhibited a dramatic evolution. In the initial bursts, the degree of polarization was generally low, and the polarization position angle showed a large, systematic rotation. The later, smaller amplitude flux density bursts exhibited much higher degrees of polarization; this is interpreted as the result of increased ordering of the magnetic field as the emitting region evolved. A change with time was detected in Faraday rotation of the polarized emission of more than 100 rad/sq m which indicates the presence of nonrelativistic gas in or near BL Lacertae. The most recent burst was highly polarized with an intrinsic polarization position angle within a few degrees of the observed orientation of jetlike structures in the source. This is strong evidence for an axial compression, perhaps the formation of a shock, in the jetlike emitting region of BL Lacertae.
Aller Hugh D.
Aller Margo F.
Hodge Philip E.
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