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Imaging and Variability Studies of CTA 102 during the 2016 January gamma-ray Flare
Li, Xiaofeng1,2,3; Mohan, P.1; An, T.1,4; Hong, Xiaoyu1,2,4; Cheng, Xiaopeng1,3; Yang, Jun5; Zhang, Yingkang1,3; Zhang, Zhongli1,4; Zhao, Wei1,4
2018-02-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume854Issue:1Pages:12
Corresponding AuthorMohan, P.(pmohan@shao.ac.cn)
AbstractThe gamma-ray-bright blazar CTA 102 is studied using imaging (new 15 GHz and archival 43 GHz Very Long Baseline Array, VLBA data) and time variable optical flux density, polarization degree, and electric vector position angle (EVPA) spanning between 2015 June 1 and 2016 October 1, covering a prominent gamma-ray flare during 2016 January. The pc-scale jet indicates expansion with oscillatory features up to 17 mas. Component proper motions are in the range 0.04-0.33 mas yr(-1) with acceleration up to 1.2 mas followed by a slowing down beyond 1.5 mas. A jet bulk Lorentz factor >= 17.5, position angle of 128 degrees.3, inclination angle <= 6 degrees.6 and intrinsic half opening angle <= 1 degrees.8 are derived from the VLBA data. These inferences are employed in a helical jet model to infer long-term variability in flux density, polarization degree, EVPA, and a rotation of the Stokes Q and U parameters. A core distance of r(core,43 GHz) = 22.9 pc, and a magnetic field strength at 1 pc and the core location of 1.57 G and 0.07 G, respectively, are inferred using the core-shift method. The study is useful in the context of estimating jet parameters and in offering clues to distinguish mechanisms responsible for variability over different timescales.
Keywordgalaxies: active galaxies: jets quasars: individual (CTA 102) relativistic processes techniques: high angular resolution
DOI10.3847/1538-4357/aaa5ac
WOS KeywordACTIVE GALACTIC NUCLEI ; SCALE JET PROPERTIES ; BASE-LINE ARRAY ; AGN JETS ; GASP-WEBT ; INNER JET ; RADIO JET ; KINEMATICS ; QUASARS ; BLAZARS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000424502900005
PublisherIOP PUBLISHING LTD
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22269
Collection中国科学院紫金山天文台
Corresponding AuthorMohan, P.
Affiliation1.Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
2.Shanghai Tech Univ, 100 Haike Rd, Shanghai 201210, Peoples R China
3.Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
5.Chalmers Univ Technol, Dept Earth & Space Sci, Onsala Space Observ, SE-43992 Onsala, Sweden
Recommended Citation
GB/T 7714
Li, Xiaofeng,Mohan, P.,An, T.,et al. Imaging and Variability Studies of CTA 102 during the 2016 January gamma-ray Flare[J]. ASTROPHYSICAL JOURNAL,2018,854(1):12.
APA Li, Xiaofeng.,Mohan, P..,An, T..,Hong, Xiaoyu.,Cheng, Xiaopeng.,...&Zhao, Wei.(2018).Imaging and Variability Studies of CTA 102 during the 2016 January gamma-ray Flare.ASTROPHYSICAL JOURNAL,854(1),12.
MLA Li, Xiaofeng,et al."Imaging and Variability Studies of CTA 102 during the 2016 January gamma-ray Flare".ASTROPHYSICAL JOURNAL 854.1(2018):12.
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