Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...266...18u&link_type=abstract
Astrophysical Journal, Part 1, vol. 266, Mar. 1, 1983, p. 18-27.
Astronomy and Astrophysics
Astronomy
70
Astronomical Maps, Bl Lacertae Objects, Elliptical Galaxies, Radio Sources (Astronomy), Flux Density, Galactic Nuclei, Quasars, Radio Emission, Relativistic Particles
Scientific paper
The extended radio structures of 12 BL Lac objects have been studied by mapping with the VLA. A number of the objects show significant extended emission on scales up to hundreds of kpc, and of these extended structures some are similar to those found in elliptical galaxies. No 'classical' double sources are found, however, among the BL Lac objects, and there is an indication that they may be divided into two variability classes on the basis of their radio structures: those which are unresolved by the VLA tend to be highly variable at cm wavelengths, while those with extensive diffuse emission exhibit little or no radio variability in their cores on a two-year time scale. This difference may be understood in light of the relativistic beaming model, if the highly variable objects have their beams aligned along the line of sight while the more extended and less variable ones do not
Johnston Ken J.
Ulvestad James S.
Weiler Kurt W.
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