NAOC Open IR
Comparison between Fermi detected and non-Fermi detected superluminal sources
Xiao HuBing1; Fan JunHui1; Yang JiangHe4; Liu Yi1; Yuan YuHai1; Tao Jun5; Costantin Denise1; Zhang YuTao1; Pei ZhiYuan1; Zhang LiXia1; Yang WenXin1
2019
Source PublicationSCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
ISSN1674-7348
Volume62Issue:12
AbstractActive galactic nuclei (AGNs) have been attracting research attention due to their special observable properties. Specifically, a majority of AGNs are detected by Fermi-LAT missions, but not by Fermi-LAT, which raises the question of weather any differences exist between the two. To answer this issue, we compile a sample of 291 superluminal AGNs (189 FDSs and 102 non-FDSs) from available multi-wavelength radio, optical, and X-ray (or ever gamma-ray) data and Doppler factors and proper motion (mu) (or apparent velocity (beta(app))); calculated the apparent velocity from their proper motion, Lorentz factor (Gamma), viewing angle (phi) and co-moving viewing angle (phi(co)) for the sources with available Doppler factor (delta); and performed some statistical analyses for both types. Our study indicated that (1) in terms of average values, FDSs have higher proper motions (mu), apparent velocities (beta(app)), Doppler factor (delta), Lorentz factor (Gamma), and smaller viewing angle (phi). Nevertheless, there is no clear difference in co-moving viewing angles (phi(co)). The results reveal that FDSs show stronger beaming effect than non-FDSs. (2) In terms of correlations: 1) both sources show positive, mutually correlated fluxes, which become closer in de-beamed fluxes; 2) with respect to apparent velocities and gamma-ray luminosity, there is a tendency for the brighter sources to have higher velocities; 3) with regard to viewing angle and observed gamma-ray luminosity, log phi = -(0.23 +/- 0.04)logL(gamma) + (11.14 +/- 1.93), while for the co-moving viewing angle and the intrinsic gamma-ray luminosity, log phi(co) = (0.09 +/- 0.01)logL gamma(in) - (1.73 +/- 0.48). These correlations show that the luminous gamma-ray sources have smaller viewing angles and a larger co-moving viewing angle, which indicate a stronger beaming effect in gamma-ray emissions.
KeywordACTIVE GALACTIC NUCLEI BL-LACERTAE OBJECTS GAMMA-RAY RELATIVISTIC JETS LORENTZ FACTORS DOPPLER FACTORS VIEWING ANGLES VLBI SURVEY MOTION KINEMATICS active galactic nuclei jets gamma-rays correlations
Language英语
Funding Project[National Natural Science Foundation of China] ; [Natural Science Foundation of Guangdong Province] ; [Astrophysics Key Subjects of Guangdong Province and Guangzhou City] ; [Science and Technology Program of Guangzhou]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/72052
Collection中国科学院国家天文台
Affiliation1.广州大学
2.中国科学院植物研究所
3.中国科学院广州地球化学研究所
4.湖南大学
5.中国科学院国家天文台
Recommended Citation
GB/T 7714
Xiao HuBing,Fan JunHui,Yang JiangHe,et al. Comparison between Fermi detected and non-Fermi detected superluminal sources[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2019,62(12).
APA Xiao HuBing.,Fan JunHui.,Yang JiangHe.,Liu Yi.,Yuan YuHai.,...&Yang WenXin.(2019).Comparison between Fermi detected and non-Fermi detected superluminal sources.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,62(12).
MLA Xiao HuBing,et al."Comparison between Fermi detected and non-Fermi detected superluminal sources".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 62.12(2019).
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