中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Parsec-scale Radio Structure of 14 Fanaroff-Riley Type 0 Radio Galaxies

文献类型:期刊论文

作者Cheng, X. -P.1,2; An, T.1
刊名ASTROPHYSICAL JOURNAL
出版日期2018-08-20
卷号863期号:2页码:8
ISSN号0004-637X
关键词galaxies: active galaxies: jets galaxies: kinematics and dynamics techniques: high angular resolution
DOI10.3847/1538-4357/aad22c
通讯作者An, T.(antao@shao.ac.cn)
英文摘要Recently a population of compact radio galaxies were classified as Fanaroff-Riley type 0 radio galaxies (FR 0s). The physical nature of FR 0s and the connection with the classical FR I and II galaxies are not currently well understood. Here, we report the radio properties of 14 FR 0s on parsec (pc) scales derived from their very long baseline interferometry (VLBI) imaging observations. All of the sources show compact structures. Four sources show relativistic beaming with Doppler-boosting factors ranging from 1.7 to 6. The brightness temperatures of the other 10 are below the equilibrium limit. Jet proper motions are determined in two sources that have multiple epoch data, between 0.23 c and 0.49 c, implying mildly relativistic jet flow. Low-amplitude flux density variation is found in J0943+3614 over a time period of 10 years. No significant variability are detected in the three other sources over timescales of a few years. The radio properties of the FR 0s inferred from the VLBI data resemble a GHz-peaked spectrum or compact steep-spectrum sources. Moreover, the diversity of their relativistic beaming indicators (brightness temperature, variability, jet proper motion) also imply that FR 0s might not be a homogeneous population of radio sources. Detailed studies of the low-power (P-1.4 GHz < 10(24) W Hz(-1)) FR 0 sources in the local universe additionally offer a promising opportunity to understand their connection to the FR Is.
WOS关键词LOW-LUMINOSITY ; POPULATION ; DICHOTOMY ; EVOLUTION ; MODEL ; JETS ; AGN
WOS研究方向Astronomy & Astrophysics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000442222700017
源URL[http://libir.pmo.ac.cn/handle/332002/21483]  
专题中国科学院紫金山天文台
通讯作者An, T.
作者单位1.Chinese Acad Sci, Key Lab Radio Astron, Shanghai Astron Observ, Shanghai 200030, Peoples R China
2.Univ Chinese Acad Sci, 19A Yuquanlu, Beijing 100049, Peoples R China
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Cheng, X. -P.,An, T.. Parsec-scale Radio Structure of 14 Fanaroff-Riley Type 0 Radio Galaxies[J]. ASTROPHYSICAL JOURNAL,2018,863(2):8.
APA Cheng, X. -P.,&An, T..(2018).Parsec-scale Radio Structure of 14 Fanaroff-Riley Type 0 Radio Galaxies.ASTROPHYSICAL JOURNAL,863(2),8.
MLA Cheng, X. -P.,et al."Parsec-scale Radio Structure of 14 Fanaroff-Riley Type 0 Radio Galaxies".ASTROPHYSICAL JOURNAL 863.2(2018):8.

入库方式: OAI收割

来源:紫金山天文台

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