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`Relativistic Beaming and Source Orientation Effects in Extragalactic Radio Sources

Article scientifique 2022 Anglais

Résumé

Abstract In this paper we use the correlation between radio core-dominance (R) and Linear size (D) properties of a sample of AGN (ESSs and FSRQs) to investigate the beaming hypothesis and orientation effects in AGNs. The distributions give mean values of D of 144.54 ± 7.52kpc, 288.40 ± 33.66kpc and 25.48 ± 0.054 kpc for ESS quasars, radio galaxies and FSRQs respectively. The R-distributions give mean values of R for ESS quasars, radio galaxies and FSRQs as 0.10 ± 0.006, 0.02 ± 0.006 and 124.4 ± 0.002 for ESS quasars, radio galaxies and FSRQs respectively. The regression analyses yield: logR = -1.47–0.11logD (kpc), with r ~ -0.06; logR = -0.68 -0.15logD (kpc), with r ~ -0.10 and logR = 2.49–1.71logD (kpc), with r ~ -0.85 for ESS radio galaxies, ESS quasars and FSRQs respectively. The results reveal that FSRQs are more consistent with beaming model than ESS quasars and ESS radio galaxies that are yet to be understood in terms of the model. The results are consistent with 6 ≤ γ ≤ 15 for FSRQs which correspond to critical cone angles, ϕc in the range of 40 ≤ φc ≤ 100. Further analyses of the results yield: 6c ≤ βapp ≤ 15c. The results are consistent with relativistic beaming and orientation scheme in which the radio axes of FSRQs observed at smaller angle to the line-of-sight of the observer has more Doppler boosting effect than ESS radio sources counterpart

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Onah, C., Ubachukwu, A., Odo, F., Aniezi, J. (2022). `Relativistic Beaming and Source Orientation Effects in Extragalactic Radio Sources. https://doi.org/10.21203/rs.3.rs-1702446/v1

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C. I. Onah A. A. Ubachukwu F. C. Odo Joseph N. Aniezi

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