Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002japa...23..235u&link_type=abstract
Journal of Astrophysics and Astronomy, 23, p. 235-242
Astronomy and Astrophysics
Astrophysics
1
Galaxies: Active, Jets, Quasars: General
Scientific paper
In this paper, we investigate the relativistic beaming effects in a well-defined sample of core-dominated quasars using the correlation between the relative prominence of the core with respect to the extended emission (defined as the ratio of core- to lobe- flux density measured in the rest frame of the source) and the projected linear size as an indicator of relativistic beaming and source orientation. Based on the orientation-dependent relativistic beaming and unification paradigm for high luminosity sources in which the Fanaroff-Riley class-II radio galaxies form the unbeamed parent population of both the lobe- and core-dominated quasars which are expected to lie at successively smaller angles to the line of sight, we find that the flows in the cores of these core-dominated quasars are highly relativistic, with optimum bulk Lorentz factor,
opt 6-16, and also highly anisotropic, with an average viewing angle, 9-16. Furthermore, the largest boosting occurs within a critical cone angle of 4-10.
Chukwude Augustine E.
Ubachukwu A. A.
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