A subset of quasars identified by large values of their Doppler redshift

doi:10.1086/521324

YNAO OpenIR > 星系研究组

	A subset of quasars identified by large values of their Doppler redshift
	Lv LZ(吕连忠)1,2,3; Tan YP(覃一平)2,4; A. C. Gupta1 ; Lu, LZ (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Yunnan, Peoples R China.
发表期刊	ASTROPHYSICAL JOURNAL
	2007-11-01
卷号	669 期号:1 页码:74-84
DOI	10.1086/521324
产权排序	第1完成单位
收录类别	SCI
关键词	Catalogs Methods : Statistical Quasars : Absorption Lines Quasars : Emission Lines Quasars : General
摘要	We have calculated the Doppler redshifts for a sample of quasars from their observed emission and absorption redshifts. We selected only those absorption redshifts that are larger than the corresponding emission redshifts (i.e., z(abs) > z(em)). The sample was extracted from a quasar catalog that contains spectra of 784 quasars, for which 11,298 absorption systems and 20,837 absorption lines were detected. We obtained 256 absorption systems with z(abs) > z(em) from 123 quasars. We find that there is a bimodal structure in the distribution of the Doppler redshifts, with one peak being located at z(Dopp) similar or equal to 0.00 and the other at zDopp similar or equal to 0.01. Around the second peak, zDopp similar or equal to 0.01, we identify a subset of quasars with Doppler redshifts greater than 0.0088. Our analysis shows that quasars in this subset are generally brighter than those with Doppler redshifts less than 0.0088. The Doppler velocities of the absorbers of these quasars are concentrated around -3000 km s(-1). This velocity likely arises from material falling toward the central region of the quasars that originates beyond the torus.
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0004-637X
URL	查看原文
归档日期	2008-01-15
WOS记录号	WOS:000250480600007
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	EMISSION-LINE PROPERTIES ; O III LAMBDA-5007 ; STELLAR OBJECTS ; ABSORPTION-SPECTRUM ; OPTICAL CATALOG ; ACTIVE NUCLEI ; ZABS GREATER ; 3C 191 ; QSO ; SYSTEMS
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/7018
专题	星系研究组
通讯作者	Lu, LZ (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Yunnan, Peoples R China.
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming, 650011 Yunnan, China 2.Department of Physics, Guangxi University, Nanning, 530004 Guangxi, China 3.Graduate University of the Chinese Academy of Sciences 4.Center for Astrophysics, Guangzhou University, Guangzhou, 510006 Guangdong, China
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Lv LZ,Tan YP,A. C. Gupta,et al. A subset of quasars identified by large values of their Doppler redshift[J]. ASTROPHYSICAL JOURNAL,2007,669(1):74-84.
APA	Lv LZ,Tan YP,A. C. Gupta,&Lu, LZ .(2007).A subset of quasars identified by large values of their Doppler redshift.ASTROPHYSICAL JOURNAL,669(1),74-84.
MLA	Lv LZ,et al."A subset of quasars identified by large values of their Doppler redshift".ASTROPHYSICAL JOURNAL 669.1(2007):74-84.

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A Subset of Quasars （782KB）	期刊论文	作者接受稿	开放获取	CC BY-NC-SA	浏览请求全文