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题名: The radio core and jet in the broad absorption-line quasar PG 1700+518
作者: Yang Ji(杨戟)1; Wu Feng(吴枫)2, 3; Paragi, Z.1, 4; An, T.2, 5, 6
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2012
卷号: 419, 期号:1, 页码:L74-L78
关键词: galaxies: active ; galaxies: individual: PG 1700+518 ; galaxies: jets ; radio continuum: galaxies
DOI: 10.1111/j.1745-3933.2011.01182.x
文章类型: Article
英文摘要: The blueshifted broad absorption lines (BAL) or troughs are observed in active galactic nuclei (AGNs) when our line of sight is intercepted by a high-speed outflow (wind), likely originating in the accretion disc. The outflow or wind can shed light on the internal structure obscured by the AGN torus. Recently, it has been shown that this outflow is rotating in the BAL quasar PG 1700+518, further supporting the accretion disc origin of the wind. With the purpose of giving independent constraints on the wind geometry, we performed high-resolution European very long baseline interferometry (VLBI) Network (EVN) observations at 1.6 GHz in 2010. Combining the results with the Very Large Array (VLA) archival data at 8.4 GHz, we present its jet structure on scales of parsec (pc) to kiloparsec (kpc) for the first time. The source shows two distinct jet features in east-west direction with a separation of around 4 kpc. The eastern feature, which has so far been assumed to hide the core, is a kpc-scale hotspot, which is completely resolved out in the EVN image. In the western jet feature, we find a compact jet component, which pinpoints the position of the central black hole in the galaxy. Jet components on both sides of the core are additionally detected in the north-west-south-east direction, and they show a symmetric morphology on scale of < 1 kpc. This two-sided jet feature is not common in the known BAL quasars and indicates that the jet axis is far away from the line of sight. Furthermore, it is nearly parallel to the scattering plane revealed earlier by optical polarimetry. By analogy to polar-scattered Seyfert 1 galaxies, we conclude that the jet likely has a viewing angle around 45 degrees. The analogy is further supported by the recent report of significant cold absorption in the soft X-rays, a nearly unique feature to polar-scattered Seyfert galaxies. Finally, our observations have confirmed the earlier finding that the majority of radio emission in this galaxy arises from AGN activity rather than star formation.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: QUIET QUASARS ; SEYFERT-GALAXIES ; POLARIZATION ; EMISSION ; NUCLEI ; LOUD ; VLBA ; QSO
收录类别: SCI
语种: 英语
WOS记录号: WOS:000298303300016
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15553
Appears in Collections:南极天文中心_期刊论文

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作者单位: 1.VLBI Europe, Joint Inst, NL-7990 AA Dwingeloo, Netherlands
2.CAS, Shanghai Astron Observ, Shanghai 200030, Peoples R China
3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
4.MTA Res Grp Phys Geodesy & Geodynam, H-1521 Budapest, Hungary
5.Chinese Acad Sci, Key Lab Radio Astron, Beijing 100864, Peoples R China
6.Netherlands Inst Radio Astron ASTRON, NL-7990 AA Dwingeloo, Netherlands
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