• On the relativistic beaming and orientation effects in core-dominated quasars

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      https://www.ias.ac.in/article/fulltext/joaa/023/03-04/0235-0242

    • Keywords

       

      Galaxies; active, jets , quasars ; general

    • Abstract

       

      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,γopt∼ 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°.

    • Author Affiliations

       

      A. A. Ubachukwu1 2 A. E. Chukwude1

      1. Department of Physics and Astronomy, University of Nigeria Nsukka, Nigeria
      2. Regular Associate of the Abdus Salam ICTP, Trieste, Italy
    • Dates

       
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