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

作　　者：Zhi-Yuan Pei Jun-Hui Fan Denis Bastieri Utane Sawangwit Jiang-He Yang 

机构地区：[1]Center for Astrophysics, Guangzhou University [2]Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province [3]Dipartimento di Fisica e Astronomia "G.Galilei", Universit`a di Padova [4]Istituto Nazionale di Fisica Nucleare [5]National Astronomical Research Institute of Thailand (NARIT) [6]Department of Physics and Electronics Science, Hunan University of Arts and Science

出　　处：《Research in Astronomy and Astrophysics》2019年第5期75-90,共16页天文和天体物理学研究（英文版）

基　　金：partially supported by the National Natural Science Foundation of China (11733001, U1531245, 10633010 and 11173009);Natural Science Foundation of Guangdong Province (2017A030313011);Astrophysics Key Subjects of Guangdong Province and Guangzhou City

摘　　要：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/Ⅱ(FRI/Ⅱ) radio galaxies. Following our previous work(Fan et al.), we present a sample of 2400 sources with measured radio flux densities of the core and extended components. The sample contains 250 BL Lacs, 520 quasars, 175 Seyferts, 1178 galaxies, 153 FRI or FRⅡ galaxies and 104 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 confirm that the correlation between core-dominance parameter and spectral index exists for a large sample presented in this work.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/Ⅱ(FRI/Ⅱ) radio galaxies. Following our previous work(Fan et al.), we present a sample of 2400 sources with measured radio flux densities of the core and extended components. The sample contains 250 BL Lacs, 520 quasars, 175 Seyferts, 1178 galaxies, 153 FRI or FRⅡ galaxies and 104 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 confirm that the correlation between core-dominance parameter and spectral index exists for a large sample presented in this work.

关 键 词：galaxies:active-galaxies galaxies:jets-quasars:general 

分 类 号：P152[天文地球—天文学]