Journal of astrophysics and astronomy | |
On the Relativistic Beaming and Orientation Effects in Core-Dominated Quasars | |
A. E. Chukwude1  A. A. Ubachukwu11  | |
[1] Department of Physics and Astronomy, University of Nigeria Nsukka, Nigeria$$ | |
关键词: Galaxies: active; jets; quasars: general.; | |
DOI : | |
学科分类:天文学(综合) | |
来源: Indian Academy of Sciences | |
【 摘 要 】
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, ð›¾opt ∼ 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°.
【 授权许可】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO201912040493338ZK.pdf | 91KB | download |