Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.7106o&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #71.06; Bulletin of the American Astronomical Society, Vol. 24, p.1234
Astronomy and Astrophysics
Astronomy
Scientific paper
Unified schemes attempt to classify radio loud quasars and Fanaroff-Riley Class II radio galaxies as a single type of object, where the source properties depend on the orientation of the jet axis relative to the line of sight. We have tested this unification using observed jet opening angles as orientation indicators. Opening angles were measured for a subset of the 3CR catalog, consisting of all identified extragalactic sources with P178MHz > 10(25) W/Hz and for which high resolution radio maps were found, providing a sample relatively free of orientation effects. The observed distributions of opening angles for the quasars were compared with those of the galaxies, and with monte carlo simulations. Preliminary results suggest the observed distributions of opening angles are inconsistent with unified schemes and simple jet models. The effects of jet inhomogeneity and intrinsic opening angle variations are discussed.
Biretta John A.
Oppenheimer Ben
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