Jet kinematics of the quasar 4C+21.35 from observations with the KaVA very long baseline interferometry array

doi:10.1093/mnras/stz970

	Jet kinematics of the quasar 4C+21.35 from observations with the KaVA very long baseline interferometry array
	Lee, Taeseok 1; Trippe, Sascha 1; Kino, Motoki 2,3; Sohn, Bong Won 4; Park, Jongho 1; Oh, Junghwan 4; Hada, Kazuhiro 5,6; Niinuma, Kotaro 7; Ro, Hyunwook 4,8; Jung, Taehyun 4
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2019-06-01
卷号	486 期号:2 页码:2412-2421
关键词	methods: observational galaxies: active galaxies: jets quasars: individual: 4C+21.35
ISSN号	0035-8711
DOI	10.1093/mnras/stz970
通讯作者	Trippe, Sascha(trippe@astro.snu.ac.kr)
英文摘要	We present the jet kinematics of the flat spectrum radio quasar (FSRQ) 4C+21.35 using time-resolved KaVA very long baseline interferometry array radio maps obtained from 2014 September to 2016 July. During two out of three observing campaigns, observations were performed bi-weekly at 22 and 43 GHz quasi-simultaneously. At 22 GHz, we identified three jet components near the core with apparent speeds up to (14.4 +/- 2.1)c. The timing of the ejection of a new component detected in 2016 is consistent with a gamma-ray flare in 2014 November. At 43 GHz, we found four inner jet (<3 mas) components with speeds from (3.5 +/- 1.4)c to (6.8 +/- 1.5)c. Jet component speeds tend to be higher with increasing distances from the core. We compared our data with archival Very Long Baseline Array (VLBA) data from the Boston University (BU) 43 GHz and the Monitoring Of Jets in Active galactic nuclei with VLBA Experiments (MOJAVE) 15.4 GHz monitoring programmes. Whereas MOJAVE data and our data are in good agreement, jet speeds obtained from the BU programme data in the same time period are about twice as high as the ones we obtain from the KaVA data. The discrepancy at 43 GHz indicates that radio arrays with different angular resolution identify and trace different jet features even when the data are obtained at the same frequency and at the same time. The flux densities of jet components decay exponentially, in agreement with a synchrotron cooling time-scale of similar to 1 yr. Using known electron Lorentz factor values (similar to 9000), we estimate the magnetic field strength to be similar to 1-3 mu T. When adopting a jet viewing angle of 5 degrees, the intrinsic jet speed is of order 0.99c.
WOS关键词	ACTIVE GALACTIC NUCLEI ; BL LACERTAE OBJECTS ; BLAZAR SEQUENCE ; ACCRETION DISKS ; RADIO ; MOJAVE ; CONNECTION
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000474899400072
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/27313]
专题	中国科学院紫金山天文台
通讯作者	Trippe, Sascha
作者单位	1.Seoul Natl Univ, Dept Phys & Astron, Seoul 08826, South Korea 2.Kogakuin Univ Technol & Engn, Acad Support Ctr, 2665-1 Nakano, Hachioji, Tokyo 1920015, Japan 3.Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan 4.Korea Astron & Space Sci Inst, Daejeon 34055, South Korea 5.Natl Astron Observ Japan, Mizusawa VLBI Observ, Mitaka, Tokyo 1818588, Japan 6.Grad Univ Adv Studies SOKENDAI, Dept Astron Sci, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan 7.Yamaguchi Univ, Grad Sch Sci & Technol Innovat, Yoshida 1677-1, Yamaguchi, Yamaguchi 7538512, Japan 8.Yonsei Univ, Dept Astron, 134 Shinchon Dong, Seoul 120749, South Korea 9.Univ Malaya, Dept Phys, Fac Sci, Kuala Lumpur 50603, Malaysia 10.MIT, Haystack Observ, 99 Millstone Rd, Westford, MA 01886 USA
推荐引用方式 GB/T 7714	Lee, Taeseok,Trippe, Sascha,Kino, Motoki,et al. Jet kinematics of the quasar 4C+21.35 from observations with the KaVA very long baseline interferometry array[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,486(2):2412-2421.
APA	Lee, Taeseok.,Trippe, Sascha.,Kino, Motoki.,Sohn, Bong Won.,Park, Jongho.,...&Lee, Jee Won.(2019).Jet kinematics of the quasar 4C+21.35 from observations with the KaVA very long baseline interferometry array.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,486(2),2412-2421.
MLA	Lee, Taeseok,et al."Jet kinematics of the quasar 4C+21.35 from observations with the KaVA very long baseline interferometry array".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 486.2(2019):2412-2421.