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Jet Properties of Compact Steep-spectrum Sources and an Eddington-ratio-driven Unification Scheme of Jet Radiation in Active Galactic Nuclei
Zhang,Jin1; Zhang,Hai-Ming2; Gan,Ying-Ying3; Yi,Ting-Feng4; Wang,Jun-Feng5; Liang,En-Wei3
2020-08-01
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume899Issue:1
AbstractAbstract Compact steep-spectrum sources (CSSs) likely represent a population of young radio-loud active galactic nuclei (AGNs) and have been identified as γ-ray-emitting sources. We present a comprehensive analysis of their γ-ray emission observed with Fermi/LAT and establish their broadband spectral energy distributions (SEDs). We derive their jet properties using SED fits with a two-zone leptonic model for radiation from the compact core and the large-scale extended region, and explore the possible signature of a unification picture of jet radiation among subclasses of AGNs. We show that the observed γ-rays of CSSs with significant variability are contributed by the radiation of their compact cores via the inverse-Compton process of the torus photons. The derived power-law distribution index of the radiating electrons is p1?~?1.5–1.8, magnetic field strength is B?~?0.15–0.6 G, and Doppler-boosting factor is δ?~?2.8–8.9. Assuming that the jet is composed of e± pairs, the compact cores of CSSs are magnetized and have a high radiation efficiency, similar to that of flat-spectrum radio quasars. The γ-ray-emitting CSSs on average have higher Eddington ratio and black hole mass than those non-GeV-detected CSSs, and they follow the correlation between the jet power in units of Eddington luminosity ( ) and Eddington ratio (REdd) with other subclasses of AGNs, , indicating that REdd would be a key physical driver for the unification scheme of AGN jet radiation.
KeywordActive galactic nuclei Relativistic jets Compact galaxies Gamma-rays Non-thermal radiation sources
DOI10.3847/1538-4357/aba2cd
Language英语
WOS IDIOP:0004-637X-899-1-aba2cd
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/61708
Collection中国科学院国家天文台
Affiliation1.Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China; jinzhang@bao.ac.cn
2.School of Astronomy and Space Science, Nanjing University, Nanjing 210023, People’s Republic of China
3.Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University, Nanning 530004, People’s Republic of China; lew@gxu.edu.cn
4.Department of Physics, Yunnan Normal University, Kunming 650500, People’s Republic of China
5.Department of Astronomy, Xiamen University, Xiamen, Fujian 361005, People’s Republic of China; jfwang@xmu.edu.cn
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhang,Jin,Zhang,Hai-Ming,Gan,Ying-Ying,et al. Jet Properties of Compact Steep-spectrum Sources and an Eddington-ratio-driven Unification Scheme of Jet Radiation in Active Galactic Nuclei[J]. The Astrophysical Journal,2020,899(1).
APA Zhang,Jin,Zhang,Hai-Ming,Gan,Ying-Ying,Yi,Ting-Feng,Wang,Jun-Feng,&Liang,En-Wei.(2020).Jet Properties of Compact Steep-spectrum Sources and an Eddington-ratio-driven Unification Scheme of Jet Radiation in Active Galactic Nuclei.The Astrophysical Journal,899(1).
MLA Zhang,Jin,et al."Jet Properties of Compact Steep-spectrum Sources and an Eddington-ratio-driven Unification Scheme of Jet Radiation in Active Galactic Nuclei".The Astrophysical Journal 899.1(2020).
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