Radio core-dominance of Fermi-blazars: implication for blazar unification

Iyida, E. U.; Odo, F. C.; Chukwude, A. E.

doi:10.1007/s10509-021-03946-2

Cited by 6 publications

(1 citation statement)

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“…To investigate a unification scheme and comprehend the relationship between the numerous classes and subclasses of LLAGN, distributive analyses of the observed source parameters are crucial (Iyida et al, 2021). Similarly, correlations between different orientation parameters of these radio sources can be used to probe the physics of their radio source components (Ubachukwu, 1997).…”

Section: Resultsmentioning

confidence: 99%

On the Unification of Low Luminosity Active Galactic Nuclei

et al. 2023

IJFMR

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We have used the distributions of observed radio properties of a subset of AGNs called low luminosity AGNs (LLAGNs) to investigate the relationship between radio-selected BL Lacs (RBLs and XBLs) and Fanaroff-Riley Type I radio galaxies (FRI) in accordance with the unified scheme. Analysis of the core and extended luminosity show that RBLs are more core dominated than XBLs which are also more core dominated than FRI radio galaxies. Distributions of core dominance parameter (R) give Rm ≈ 42.41 ± 10.77, 5.08 ± 1.57, and 0.34 ± 0.0024 for RBLs, XBLs, and FRI, corresponding to mean viewing angles (ϕm) in the range ϕ ≈ 70 − 170, 130 − 240 and 200 − 280 respectively. Regression analysis of the three samples shows that the core to extended luminosity plot (LC − LE) yields a strong correlation of r ≈ 0.67±0.52, 0.85±0.46, and 0.79±0.61 for FRI, RBLs and XBLs at 95% confidence level. Similarly, regression analysis of R and ϕ for FRI, RBLs, and XBLs all yield a strong anti-correlation of r ≈ −0.98±0.02, −0.64±40.52, and 0.75±4.45. These results are consistent with BL Lac/FRI unification and suggest that relativistic beaming of the core and extended emissions is significant in low luminosity AGNs and thus a strong support for the unified scheme.

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Section: Resultsmentioning

confidence: 99%

On the Unification of Low Luminosity Active Galactic Nuclei

et al. 2023

IJFMR

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Investigating possible unification of Seyfert galaxies and blazars in Fermi‐Large Area Telescope sample

2021

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Statistical analyses are invaluable methods used to understand intrinsic emission processes and the unification of extragalactic radio sources. In this paper, we collected radio, X-ray, and γ-ray data of blazars from the Fermi Large Area Telescope (Fermi-LAT) and Seyfert galaxies from the INTEGRAL/IBIS survey and investigated the relationship between the emission properties of Seyfert galaxies and blazar subclasses of flat-spectrum radio quasars (FSRQs) and BL Lac objects (BL Lacs). The results show from the average values that these objects follow a sequence that is indicative of probable Seyfert galaxies-BL Lacs-FSRQs unification. We discovered that Seyfert galaxies, BL Lacs, and FSRQs share similar emission characteristics in X-ray luminosity (L X-ray ), suggestive of fundamental connection while the γ-ray (L γ-ray ) and radio (L radio ) luminosities of Seyfert galaxies are the least powerful, signifying an evolving structure. From the two-dimensional Kolmogorov-Smirnov (K − S) test, we found that Seyfert galaxies differ from the blazar subclasses in L radio while there is no significant difference between them in L X-ray and L γ-ray which implies that high-energy emissions in Seyfert galaxies and blazar subclasses may come from the same emission mechanism. Significant positive correlations (with coefficient r > 0.60) exist between the high-energy luminosities (X-ray and γ-ray) and the low-energy components (radio) within the whole sample of blazars and Seyfert galaxies implying a form of connection between them. These results are not only consistent with the prediction of the unified scheme for blazars but also show that Seyfert galaxies have an evolutionary link with blazar subclasses.

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