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Two in one? A possible dual radio-emitting nucleus in the quasar SDSS J1425+3231
Frey, S.1; Paragi, Z.2; An, T.3,4,5; Gabanyi, K. E.1,6; Frey,S
2012-09-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume425Issue:2Pages:1185-1191
AbstractThe radio-emitting quasar SDSS J1425+3231 (z = 0.478) was recently found to have double-peaked narrow [O III] optical emission lines. Based on the analysis of the optical spectrum, Peng et al. suggested that this object harbours a dual active galactic nucleus (AGN) system, with two supermassive black holes (SMBHs) separated on a kpc scale. SMBH pairs should be ubiquitous according to hierarchical galaxy formation scenarios in which the host galaxies and their central black holes grow together via interactions and eventual mergers. Yet the number of presently confirmed dual SMBHs on kpc or smaller scales remains small. A possible way to obtain direct observational evidence for duality is to conduct high-resolution radio interferometric measurements, provided that both AGN are in an evolutionary phase when some activity is going on in the radio. We used the technique of very long baseline interferometry (VLBI) to image SDSS J1425+3231. Observations made with the European VLBI Network at 1.7- and 5-GHz frequencies in 2011 revealed compact radio emission at sub-mJy flux density levels from two components with a projected linear separation of similar to 2.6 kpc. These two components support the possibility of a dual AGN system. The weaker component remained undetected at 5 GHz due to its steep radio spectrum. Further study will be necessary to securely rule out a jetshock interpretation of the less dominant compact radio source. Assuming the dual AGN interpretation, we discuss black hole masses, luminosities and accretion rates of the two components using available X-ray, optical and radio data. While high-resolution radio interferometric imaging is not an efficient technique to search blindly for dual AGN, it is an invaluable tool to confirm the existence of selected candidates.
KeywordTechniques: Interferometric Galaxies: Active Quasars: Individual: Sdss j1425+3231 Radio Continuum: Galaxies
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1111/j.1365-2966.2012.21491.x
WOS KeywordACTIVE GALACTIC NUCLEI ; DIGITAL SKY SURVEY ; BINARY BLACK-HOLE ; LOW-LUMINOSITY ; BOLOMETRIC LUMINOSITY ; FUNDAMENTAL PLANE ; VLA OBSERVATIONS ; JET ; AGNS ; GALAXIES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000307888300024
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10090
Collection期刊(老文献)
Corresponding AuthorFrey,S
Affiliation1.FOMI Satellite Geodet Observ, H-1592 Budapest, Hungary
2.Joint Inst VLBI Europe, NL-7990 AA Dwingeloo, Netherlands
3.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
4.Netherlands Inst Radio Astron ASTRON, NL-7990 AA Dwingeloo, Netherlands
5.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
6.MTA Res Ctr Astron & Earth Sci, Konkoly Observ, H-1525 Budapest, Hungary
Recommended Citation
GB/T 7714
Frey, S.,Paragi, Z.,An, T.,et al. Two in one? A possible dual radio-emitting nucleus in the quasar SDSS J1425+3231[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,425(2):1185-1191.
APA Frey, S.,Paragi, Z.,An, T.,Gabanyi, K. E.,&Frey,S.(2012).Two in one? A possible dual radio-emitting nucleus in the quasar SDSS J1425+3231.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,425(2),1185-1191.
MLA Frey, S.,et al."Two in one? A possible dual radio-emitting nucleus in the quasar SDSS J1425+3231".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 425.2(2012):1185-1191.
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