NAOC Open IR
Leptonic or Hadronic Emission: The X-Ray Radiation Mechanism of Large-scale Jet Knots in 3C 273
Wang, Zhen-Jie1; Zhang, Jin2; Sun, Xiao-Na3; Liang, En-Wei1
2020-04-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume893Issue:1Pages:11
AbstractA comprehensively theoretical analysis of the broadband spectral energy distributions (SEDs) of large-scale jet knots in 3C 273 is presented to reveal their X-ray radiation mechanism. We show that these SEDs cannot be explained with a single-electron population model when the Doppler boosting effect is either considered or not. By adding a more energetic electron (the leptonic model) or proton (the hadronic model) population, the SEDs of all knots are well represented. In the leptonic model, the electron population that contributes the X-ray emission is more energetic than the one responsible for the radio-optical emission by almost two orders of magnitude; the derived equipartition magnetic field strengths (B-eq) are similar to 0.1 mG. In the hadronic model, protons with energy similar to 20 PeV are required to interpret the observed X-rays; the B-eq values are several mG, larger than those in the leptonic model. Based on the fact that no resolved substructures are observed in these knots and the fast cooling time of the high-energy electrons does not easily explain the observed X-ray morphologies, we argue that the two distinct electron populations accelerated in these knots are unreasonable and their X-ray emission is attributed to the proton synchrotron radiation accelerated in these knots. In cases where these knots have relativistic motion toward the observer, the super-Eddington issue of the hadronic model can be avoided. Multiwavelength polarimetry and gamma-ray observations with high resolution may be helpful to discriminate these models.
KeywordGalaxy jets Active galactic nuclei Non-thermal radiation sources X-ray active galactic nuclei
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangxi Natural Science Foundation ; Guangxi Natural Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangxi Natural Science Foundation ; Guangxi Natural Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangxi Natural Science Foundation ; Guangxi Natural Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangxi Natural Science Foundation ; Guangxi Natural Science Foundation
DOI10.3847/1538-4357/ab7d35
WOS KeywordACTIVE GALACTIC NUCLEI ; HOT-SPOTS ; SYNCHROTRON-RADIATION ; ENERGY-DISTRIBUTION ; DOPPLER FACTORS ; RADIO ; CHANDRA ; ACCELERATION ; GALAXIES ; CAVITIES
Language英语
Funding ProjectNational Natural Science Foundation of China[11973050] ; 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] ; Guangxi Natural Science Foundation[2017AD22006] ; Guangxi Natural Science Foundation[2018GXNSFGA281007]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangxi Natural Science Foundation ; Guangxi Natural Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangxi Natural Science Foundation ; Guangxi Natural Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangxi Natural Science Foundation ; Guangxi Natural Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangxi Natural Science Foundation ; Guangxi Natural Science Foundation
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000528741600001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/55081
Collection中国科学院国家天文台
Corresponding AuthorZhang, Jin
Affiliation1.Guangxi Univ, Sch Phys Sci & Technol, Guangxi Key Lab Relativist Astrophys, Nanning 530004, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Space Astron & Technol, Beijing 100012, Peoples R China
3.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Peoples R China
Recommended Citation
GB/T 7714
Wang, Zhen-Jie,Zhang, Jin,Sun, Xiao-Na,et al. Leptonic or Hadronic Emission: The X-Ray Radiation Mechanism of Large-scale Jet Knots in 3C 273[J]. ASTROPHYSICAL JOURNAL,2020,893(1):11.
APA Wang, Zhen-Jie,Zhang, Jin,Sun, Xiao-Na,&Liang, En-Wei.(2020).Leptonic or Hadronic Emission: The X-Ray Radiation Mechanism of Large-scale Jet Knots in 3C 273.ASTROPHYSICAL JOURNAL,893(1),11.
MLA Wang, Zhen-Jie,et al."Leptonic or Hadronic Emission: The X-Ray Radiation Mechanism of Large-scale Jet Knots in 3C 273".ASTROPHYSICAL JOURNAL 893.1(2020):11.
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