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题名: EVIDENCE FOR THE INTERMEDIATE BROAD-LINE REGION OF REVERBERATION-MAPPED ACTIVE GALACTIC NUCLEUS PG 0052+251
作者: Zhang XueGuang(张雪光)1, 2
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2011-11-10
卷号: 741, 期号:2
关键词: galaxies: active ; galaxies: individual (PG 0052+251) ; galaxies: nuclei ; quasars: emission lines
DOI: 10.1088/0004-637X/741/2/104
文章类型: Article
英文摘要: We study the properties of the broad-line region (BLR) of a well-known reverberation-mapped active galactic nucleus (AGN) in order to find reliable evidence for the intermediate BLR. We first check properties of the mapped AGN collected from the literature in the plane of sigma(2)(H beta)/sigma(2)(H alpha) versus R(BLR)(H alpha)/R(BLR)(H beta). Commonly, virial black hole masses based on observed broad H alpha and H beta should be coincidental. However, among the mapped objects, PG 0052 and NGC 4253 are two apparent outliers in the plane of sigma(2)(H beta)/sigma(2)(H alpha) versus R(BLR)(H alpha)/R(BLR)(H beta), which indicates that BLRs of PG 0052 and NGC 4253 have some special characters. Based on the 55 public spectra of PG 0052, the BLR of PG 0052 has been carefully studied in detail. We find that the line width ratio of the total observed broad H alpha to the total observed broad H beta is similar to 0.7, which is much smaller than the theoretical/observational value of similar to 0.9. Furthermore, the flux ratio of the total broad H alpha to the total broad H beta is about 6.8 (Balmer decrement), which is not a reasonable value for the blue quasar PG 0052+251. Moreover, properties of line cores based on the principal component analysis technique confirm that there is one inner broad component and one seriously obscured intermediate broad component in the BLR of PG 0052. If the seriously obscured intermediate BLR was accepted, properties of PG 0052 in the plane of sigma(2)(H beta)/sigma(2)(H alpha) versus R(BLR)(H alpha)/R(BLR)(H)beta could be reproduced, which indicates that the intermediate BLR actually is appropriate for the mapped quasar PG 0052+251. Finally, the large distance between the inner and the intermediate components of the BLR based on the results of the cross-correlation function rejects the possibility that the intermediate component is probably an extended part of the inner component of the BLR.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: BLACK-HOLE MASSES ; SINGLE-EPOCH SPECTRA ; DIGITAL SKY SURVEY ; H-ALPHA EMISSION ; SEYFERT-GALAXIES ; RECOMBINATION LINES ; OPTICAL WAVELENGTHS ; EDDINGTON RATIO ; QUASAR SPECTRA ; TELL US
收录类别: SCI
语种: 英语
WOS记录号: WOS:000296771500037
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15960
Appears in Collections:南极天文中心_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA
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