On the viewing angle to broad-lined radio galaxies

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

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arXiv · astro-ph/0012070

On the viewing angle to broad-lined radio galaxies

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

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Abstract

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.

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J. Dennett-Thorpe, P. D. Barthel, I. M. van Bemmel. 2000-12-04. On the viewing angle to broad-lined radio galaxies. https://arxiv.org/abs/astro-ph/0012070

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