Affiliation:
1. Department of Industrial Physics, Chukwuemeka Odumegwu Ojukwu University, Anambra State, Nigeria
2. Department of Physics and Astronomy, Faculty of Physical Sciences, Carver Building, University of Nigeria, Nsukka, Enugu State, Nigeria
Abstract
Using the projected linear size, (D) as an orientation parameter, the armlength ratio, (Q) and the lobe-luminosity ratio, (R) as asymmetry parameters, we test the FR-II galaxies (Gs) and radio-loud quasar (Qs) unification scheme. Using the median values of our binned sample, our results, generally indicate that the D of the radio sources are smaller at higher redshifts z and at larger Q values, with the D of Qs smaller than those of Gs across all Q, z and R bins. Also, the D of Gs appear smaller for lower values of Q, if R ≤ 1.0 but become larger at higher values of Q if R > 1.0. For Qs, the D decreases with increasing Q, R and z. These results imply that the beaming effect is more important in Qs than in Gs. The D − R regression analyses for different Q and z subsamples suggest the importance of factors other than beaming and orientation in the interpretation of the evolution of these radio sources.
Publisher
Universidad Nacional Autonoma de Mexico
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
1 articles.
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