Speaker
Description
The unified model of jetted active galactic nuclei (AGNs) based on intrinsic properties presumes that the blazar subtypes of BL Lacertae objects (BLs) and flat-spectrum radio quasars (FSRQs) are aligned equivalents of Fanaroff–Riley type I (FR I) and Fanaroff–Riley type II (FR II) radio galaxies from where their parent sources are obtained. Using compiled radio, X-ray and γ-ray data of 397 blazars and 110 radio galaxies detected by the Fermi Large Area Telescope (Fermi/LAT- 4LAC), We computed the γ-ray core-dominance parameter (Rγ) and γ-ray emission components (beamed and unbeamed) to study the consequences of relativistic beaming and orientation effects on γ-ray properties of radio galaxies, BLs and FSRQs. Analysis of data shows that the distributions of RX and Rγ, on average, are consistent with the prediction of the unified scheme in which FSRQs and BLs are strongly beamed and are inclined at smaller angles than radio galaxies. Through statistical tests with chance probability, p < 0.05, we find that the distributions of RX and Rγ for radio galaxies and the blazar subtypes are not significantly different. There is a regular positive trend (r > +0.60) in the variation of radio core-dominance parameter – X-ray luminosity (Rr - Lx) data from radio galaxies to FSRQs through BLs, which suggests that radio galaxies could be relativistically less beamed population of jetted AGNs. The results are consistent with the unified model for radio galaxies and the conventional blazar subtypes.
