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Astron. Astrophys. 364, 501-516 (2000)

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On the viewing angle to broad-lined radio galaxies

J. Dennett-Thorpe, P.D. Barthel and I.M. van Bemmel

University of Groningen, Kapteyn Institute, 9700AV Groningen, The Netherlands

Received 8 September 2000 / Accepted 20 October 2000


We address the nature of broad-lined radio galaxies, in particular their radio axis orientation, using new, matched resolution, dual frequency radio observations of a sample of twelve nearby broad-lined extragalactic 3C objects. Radio spectral index and depolarisation asymmetries indicate that these objects have a preferred orientation with respect to the observer. In addition, the spectral asymmetries are suggestive of lower Doppler factors in the broad-lined radio galaxies when compared to 3C quasars. This is in agreement with their optical properties, and leads to the conclusion that some objects are lower powered versions - at similar lines of sight - of the more distant quasars, whereas others are at larger angles to the line of sight.

Send offprint requests to: J. Dennett-Thorpe

Correspondence to: jdt@astro.rug.nl; pdb@astro.rug.nl

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© European Southern Observatory (ESO) 2000

Online publication: January 29, 2001