Structural asymmetries, relativistic beaming and orientation effects in Lobe-Dominated Quasars |
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| Authors: | C C Onuchukwu A A Ubachukwu |
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| Institution: | 1. Department of Industrial Physics, Anambra State University, Uli, Anambra, Nigeria
2. Department of Physics and Astronomy, University of Nigeria Nsukka, Nsukka, Nigeria
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| Abstract: | We have examined statistically, structural asymmetries and simple relativistic beaming/source orientation in a sample of Lobe-Dominated Quasars (LDQs) using the source size D as orientation parameter; relative core strength R as beaming parameter; arm-length ratio Q, apparent flux ratio R ?, and bending angle Φ as asymmetric parameters. Our result for Q>1.5, based on the median value data is inconsistent with beaming scenario, where we expect stronger negative correlation for more asymmetric sources, between our beaming parameter R and orientation parameter D than for less asymmetric sources Q≤1.5. This observation indicates that structural asymmetries may depend more on intrinsic factors than beaming. Our kinematic asymmetric model of extra galactic radio sources suggests that larger (possibly older) sources are less asymmetric, which may be interpreted to be indicative of other factors other than beaming as responsible for the observed asymmetries in radio sources. |
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