The relationship between the radio core-dominance parameter and spectral index in different classes of extragalactic radio sources (III)

Active galactic nuclei (AGNs) can be divided into two major classes, namely radio-loud and radio-quiet AGNs. A small subset of the radio-loud AGNs is called blazars, which are believed to be unified with Fanaroff-Riley type I and type II (FRI&II) radio galaxies. Following our previous work, we p...

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Bibliographic Details
Published in:arXiv.org 2019-09
Main Authors: Zhi-Yuan Pei, Jun-Hui, Fan, Bastieri, Denis, Jiang-He, Yang, Hu-Bing, Xiao, Yang, W X
Format: Article
Language:English
Subjects:
Active galactic nuclei
Blazars
Dominance
Extragalactic radio sources
Parameters
Radio galaxies
Spectra
Online Access:Get full text
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Summary:Active galactic nuclei (AGNs) can be divided into two major classes, namely radio-loud and radio-quiet AGNs. A small subset of the radio-loud AGNs is called blazars, which are believed to be unified with Fanaroff-Riley type I and type II (FRI&II) radio galaxies. Following our previous work, we present a latest sample of 966 sources with measured radio flux densities of the core and extended components. The sample includes 83 BL Lacs, 473 FSRQs, 101 Seyferts, 245 galaxies, 52 FRIs&IIs and 12 unidentified sources. We then calculate the radio core-dominance parameters and spectral indices and study their relationship. Our analysis shows that the core-dominance parameters and spectral indices are quite different for different types of sources. We also corroborate that the correlation between core-dominance parameter and radio spectral index extends over all the sources in a large sample presented.
ISSN:2331-8422
DOI:10.48550/arxiv.1909.06177