Jet Radiation Properties of 4C+49.22: from the Core to Large-scale Knots

doi:10.3847/1538-4357/aadd0b

CORC > 国家天文台 > 中国科学院国家天文台

	Jet Radiation Properties of 4C+49.22: from the Core to Large-scale Knots
	Zhang, Jin 1; Zhang, Hai-Ming 2; Yao, Su 3,4; Guo, Sheng-Chu 2; Lu, Rui-Jing 2; Liang, En-Wei 2
刊名	ASTROPHYSICAL JOURNAL
	2018-10-01
卷号	865 期号:2 页码:11
关键词	galaxies: active galaxies: individual (4C+49.22) galaxies: jets radiation mechanisms: non-thermal
ISSN号	0004-637X
DOI	10.3847/1538-4357/aadd0b
英文摘要	4C +49.22 is a gamma-ray flat-spectrum radio quasar with a bright and knotty jet. We investigate the properties of the core and large-scale knots by using their spectral energy distributions (SEDs). Analysis of the Fermi/LAT data from 4C +49.22 over the past eight years reveals a long-term steady gamma-ray emission component besides bright outbursts. For the core region, the gamma-ray emission together with the simultaneous emission in the low-energy bands at different epochs is explained with the single-zone leptonic model. The derived magnetization parameters and radiation efficiencies of the radio-core jet decrease as the gamma-ray flux decays, likely indicating that a large part of the magnetic energy is converted to the kinetic energy of particles on a parsec scale. For the large-scale knots, their radio-optical-X-ray SEDs can be reproduced with the leptonic model by considering the inverse Compton scattering of cosmic microwave background photons. The sum of the predicted gamma-ray fluxes of these knots is comparable to that observed with LAT at similar to 10(24) Hz of the steady gamma-ray component, indicating that the steady gamma-ray emission may be partially contributed by these large-scale knots. This may conceal the flux variations of the low-level gamma-ray emission from the radio core. The derived bulk Lorentz factors of the knots decrease with increasing distance from the core, illustrating the deceleration of the jet on a large scale. The powers of the core and knots are roughly of the same order, but the jet changes from highly magnetized in the core region to particle-dominated in the large-scale knots.
资助项目	National Natural Science Foundation of China[11573034] ; National Natural Science Foundation of China[11533003] ; National Natural Science Foundation of China[11851304] ; National Natural Science Foundation of China[U1731239] ; National Basic Research Program (973 Programme) of China[2014CB845800] ; Guangxi Science Foundation for Guangxi distinguished professors[2017AD22006] ; KIAA-CAS Fellowship ; Peking University ; Chinese Academy of Sciences
WOS关键词	ACTIVE GALACTIC NUCLEI ; X-RAY-EMISSION ; RADIO QUASARS ; SPECTROSCOPIC OBSERVATIONS ; ULTRARELATIVISTIC SHOCKS ; PARTICLE-ACCELERATION ; VLA OBSERVATIONS ; SPACE-TELESCOPE ; BLACK-HOLE ; HOT-SPOTS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000445822300009
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program (973 Programme) of China ; National Basic Research Program (973 Programme) of China ; Guangxi Science Foundation for Guangxi distinguished professors ; Guangxi Science Foundation for Guangxi distinguished professors ; KIAA-CAS Fellowship ; KIAA-CAS Fellowship ; Peking University ; Peking University ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program (973 Programme) of China ; National Basic Research Program (973 Programme) of China ; Guangxi Science Foundation for Guangxi distinguished professors ; Guangxi Science Foundation for Guangxi distinguished professors ; KIAA-CAS Fellowship ; KIAA-CAS Fellowship ; Peking University ; Peking University ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program (973 Programme) of China ; National Basic Research Program (973 Programme) of China ; Guangxi Science Foundation for Guangxi distinguished professors ; Guangxi Science Foundation for Guangxi distinguished professors ; KIAA-CAS Fellowship ; KIAA-CAS Fellowship ; Peking University ; Peking University ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program (973 Programme) of China ; National Basic Research Program (973 Programme) of China ; Guangxi Science Foundation for Guangxi distinguished professors ; Guangxi Science Foundation for Guangxi distinguished professors ; KIAA-CAS Fellowship ; KIAA-CAS Fellowship ; Peking University ; Peking University ; Chinese Academy of Sciences ; Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/22911]
专题	中国科学院国家天文台
通讯作者	Zhang, Jin
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Key Lab Space Astron & Technol, Beijing 100012, Peoples R China 2.Guangxi Univ, Dept Phys, Guangxi Key Lab Relativist Astrophys, Nanning 530004, Peoples R China 3.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 4.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Jin,Zhang, Hai-Ming,Yao, Su,et al. Jet Radiation Properties of 4C+49.22: from the Core to Large-scale Knots[J]. ASTROPHYSICAL JOURNAL,2018,865(2):11.
APA	Zhang, Jin,Zhang, Hai-Ming,Yao, Su,Guo, Sheng-Chu,Lu, Rui-Jing,&Liang, En-Wei.(2018).Jet Radiation Properties of 4C+49.22: from the Core to Large-scale Knots.ASTROPHYSICAL JOURNAL,865(2),11.
MLA	Zhang, Jin,et al."Jet Radiation Properties of 4C+49.22: from the Core to Large-scale Knots".ASTROPHYSICAL JOURNAL 865.2(2018):11.