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VLBI OBSERVATIONS OF 10 COMPACT SYMMETRIC OBJECT CANDIDATES: EXPANSION VELOCITIES OF HOT SPOTS
An, T1,2,3; Wu, F1,3,4; Yang, J5; Taylor, GB6; Hong, XY1,3; Baan, WA2; Liu, X3,7; Wang M(汪敏)8; Zhang, HB9; Wang, WH1,3; Chen, X1,3; Cui, L7; Hao LF(郝龙飞)8; Zhu, XY9; An, T (reprint author), CAS, Shanghai Astron Observ, Shanghai 200030, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2012-01
卷号198期号:1
DOI10.1088/0067-0049/198/1/5
产权排序第8完成单位
收录类别SCI
关键词Galaxies: Active Galaxies: Evolution Galaxies: Jets Galaxies: Nuclei Radio Continuum: Galaxies
摘要Observations of 10 Compact Symmetric Object (CSO) candidates have been made with the Very Long Baseline Array (VLBA) at 8.4 GHz in 2005 and with a combined Chinese and European Very Long Baseline Interferometry (VLBI) array at 8.4 GHz in 2009. The 2009 observations incorporate for the first time the two new Chinese telescopes at Miyun and Kunming for international astrophysical observations. The observational data, in combination with archival VLBA data from previous epochs, have been used to derive the proper motions of the VLBI components. Because of the long time baseline of similar to 16 years of the VLBI data sets, the expansion velocities of the hot spots can be measured at an accuracy as high as similar to 1.3 mu as yr(-1). Six of the ten sources are identified as CSOs with a typical double or triple morphology on the basis of both spectral index maps and their mirror symmetry of proper motions of the terminal hot spots. The compact double source J1324+4048 is also identified as a CSO candidate. Among the three remaining sources, J1756+5748 and J2312+3847 are identified as core-jet sources with proper motions of their jet components relating to systemic source expansion. The third source J0017+5312 is likely also a core-jet source, but a robust detection of a core is needed for an unambiguous identification. The kinematic ages of the CSOs derived from proper motions range from 300 to 2500 years. The kinematic age distribution of the CSOs confirm an overabundance of compact young CSOs with ages less than 500 years. CSOs with known kinematic ages may be used to study the dynamical evolution of extragalactic radio sources at early stages.
项目资助者program of the Light in China'sWestern Region [XBBS201024] ; National Aeronautics and Space Administration ; National Natural Science Foundation of Science and Technology of China [2009CB24900] ; Science & Technology Commission of Shanghai Municipality [06DZ22101] ; Chinese Academy of Sciences
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0067-0049
URL查看原文
WOS记录号WOS:000298661100005
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]SPECTRUM RADIO-SOURCES ; PEARSON-READHEAD SURVEY ; HIGH-FREQUENCY PEAKERS ; RAY BLAZAR CANDIDATES ; QUASI-STELLAR OBJECTS ; FREE-FREE ABSORPTION ; STEEP-SPECTRUM ; APPARENT CONTRACTION ; CALIBRATOR SURVEY ; KINEMATIC AGES
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被引频次:23[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5626
专题射电天文研究组
通讯作者An, T (reprint author), CAS, Shanghai Astron Observ, Shanghai 200030, Peoples R China.
作者单位1.Shanghai Astronomical Observatory, CAS, 200030, Shanghai, China
2.ASTRON, P.O. Box 2, 7990 AA Dwingeloo, The Netherlands
3.Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, China
4.Graduate University of the Chinese Academy of Sciences, 100049, Beijing, China
5.Joint Institute for VLBI in Europe, Postbus 2, 7990AA Dwingeloo, The Netherlands
6.Department of Physics and Astronomy, University of New Maxico, Albuquerque, NM, 87131, USA
7.National Astronomical Observatories/Xinjiang Astronomical Observatory, CAS, Urumqi 830011, China
8.National Astronomical Observatories/Yunnan Observatory, CAS, Kunming 650011, China
9.National Astronomical Observatories, CAS, Beijing 100012, China
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An, T,Wu, F,Yang, J,et al. VLBI OBSERVATIONS OF 10 COMPACT SYMMETRIC OBJECT CANDIDATES: EXPANSION VELOCITIES OF HOT SPOTS[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2012,198(1).
APA An, T.,Wu, F.,Yang, J.,Taylor, GB.,Hong, XY.,...&An, T .(2012).VLBI OBSERVATIONS OF 10 COMPACT SYMMETRIC OBJECT CANDIDATES: EXPANSION VELOCITIES OF HOT SPOTS.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,198(1).
MLA An, T,et al."VLBI OBSERVATIONS OF 10 COMPACT SYMMETRIC OBJECT CANDIDATES: EXPANSION VELOCITIES OF HOT SPOTS".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 198.1(2012).
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