期刊论文详细信息
Journal of astrophysics and astronomy | |
On Asymmetries in Powerful Radio Sources and the Quasar/Galaxy Unification | |
C. I. Onah1 21  A. A. Ubachukwu2  F. C. Odo22  | |
[1]Department of Physics, Federal University of Technology, Owerri, Nigeria$$ | |
[2]Department of Physics & Astronomy, University of Nigeria, Nsukka, Nigeria$$ | |
关键词: Galaxies; active galaxies: quasars; general.; | |
DOI : | |
学科分类:天文学(综合) | |
来源: Indian Academy of Sciences | |
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【 摘 要 】
We utilize the distributions of fractional separation difference (ð‘¥) as asymmetry parameter, linear size (ð·) and core-to lobe luminosity ratio (ð‘…) as orientation indicators, to investigate a consequence of radio source orientation and relativistic beaming effects in a sample of powerful non-symmetric extragalactic radio sources. In this scenario, radio sources viewed at small orientation angles to the line-of-sight are expected to show a high degree of asymmetry in observed radio structures due to relativistic beaming, with foreshortened projected linear sizes. A simple consequence of this is the ð‘¥ - ð· anti-correlation. Results show a tight correlation (ð‘Ÿ > 0.8) between the total and core radio luminosities and a clear ð‘¥ - ð· anti-correlation (𑟠∼ -0.5). The observed ð‘¥ - ð· anti-correlation is consistent with average orientation angle 𜙠≈ 48° and a maximum Lorentz factor 𛾠∼ 2 for the sample, with minimum angular separation of 26° between radio galaxies and quasars. However, there is no clear ð‘¥ - ð‘… correlation. While the results are consistent with quasar/galaxy unification via orientation, intrinsic asymmetry also seems to play a major role.【 授权许可】
Unknown
【 预 览 】
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RO201912040493859ZK.pdf | 549KB | ![]() |