Two in one? A possible dual radio-emitting nucleus in the quasar SDSS J1425+3231

	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
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2012-09-01
卷号	425 期号:2 页码:1185-1191
关键词	techniques: interferometric galaxies: active quasars: individual: SDSS J1425+3231 radio continuum: galaxies
ISSN号	0035-8711
通讯作者	Frey,S
英文摘要	The 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.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ACTIVE GALACTIC NUCLEI ; DIGITAL SKY SURVEY ; BINARY BLACK-HOLE ; LOW-LUMINOSITY ; BOLOMETRIC LUMINOSITY ; FUNDAMENTAL PLANE ; VLA OBSERVATIONS ; JET ; AGNS ; GALAXIES
收录类别	SCI
语种	英语
WOS记录号	WOS:000307888300024
公开日期	2014-05-15
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/10090]
专题	紫金山天文台_期刊（老文献）
作者单位	1.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
推荐引用方式 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..(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.