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VLBA 24 and 43 GHz observations of massive binary black hole candidate PKS 1155+251
Yang, Xiaolong1,2; Liu, Xiang1,3; Yang, Jun4,5; Mi, Ligong6; Cui, Lang1,3; An, Tao3,5; Hong, Xiaoyu3,5; Ho, Luis C.7,8
2017-10-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume471Issue:2Pages:1873-1878
Corresponding AuthorLiu, Xiang(liux@xao.ac.cn)
AbstractPKS 1155 + 251 is a radio-loud quasar source at z = 0.203. Observations using very long baseline interferometry (VLBI) at similar to 2, 5, 8 and 15 GHz show that the structure of the radio source is quite complicated on parsec scales and that the outer hotspots are apparently undergoing a significant contraction. Because these results cannot be fully explained based on the compact symmetric object (CSO) scenario with a radio core located between the northern and southern complexes, we made observations with the Very Long Baseline Array (VLBA) at 24 and 43 GHz to search for compact substructures and alternative interpretations. The results show that the radio core revealed in the previous VLBI observations remains compact with a flat spectrum in our sub-milli-arcsecond-resolution images; the northern lobe emission becomes faint at 24 GHz and is mostly resolving out at 43 GHz; the southern complex is more bright but has been resolved into the brightest southern-end (S1) and jet or tail alike components westwards. Explaining the southern components aligned westward with a standard CSO scenario alone remains a challenge. As for the flatter spectral index of the southern-end component S1 between 24 and 43 GHz in our observations and the significant 15 GHz VLBA flux variability of S1, an alternative scenario is that the southern complex may be powered by a secondary black hole residing at S1. But more sensitive and high-resolution VLBI monitoring is required to discriminate the CSO and the binary black hole scenarios.
Keywordgalaxies: jets galaxies: nuclei quasars: individual: PKS 1155+251 quasars: supermassive black holes radio continuum: galaxies
DOI10.1093/mnras/stx1743
WOS KeywordACTIVE GALACTIC NUCLEI ; RADIO-EMITTING NUCLEUS ; PEAKED NARROW LINES ; POLARIMETRY SURVEY ; SKY SURVEY ; SYSTEM ; AGNS ; POLARIZATION ; EVOLUTION ; PROGRAM
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000409022700039
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22674
Collection中国科学院紫金山天文台
Corresponding AuthorLiu, Xiang
Affiliation1.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
4.Chalmers, Onsala Space Observ, Dept Earth & Space Sci, SE-43992 Onsala, Sweden
5.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
6.Qiannan Normal Univ Nationalities, Longshan St, Duyun 558000, Peoples R China
7.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
8.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Yang, Xiaolong,Liu, Xiang,Yang, Jun,et al. VLBA 24 and 43 GHz observations of massive binary black hole candidate PKS 1155+251[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,471(2):1873-1878.
APA Yang, Xiaolong.,Liu, Xiang.,Yang, Jun.,Mi, Ligong.,Cui, Lang.,...&Ho, Luis C..(2017).VLBA 24 and 43 GHz observations of massive binary black hole candidate PKS 1155+251.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,471(2),1873-1878.
MLA Yang, Xiaolong,et al."VLBA 24 and 43 GHz observations of massive binary black hole candidate PKS 1155+251".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 471.2(2017):1873-1878.
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