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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.
Source PublicationASTROPHYSICAL JOURNAL
2007-11-01
Volume669Issue:1Pages:74-84
DOI10.1086/521324
Contribution Rank第1完成单位
Indexed BySCI
KeywordCatalogs Methods : Statistical Quasars : Absorption Lines Quasars : Emission Lines Quasars : General
AbstractWe 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.
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-637X
URL查看原文
Archive Date2008-01-15
WOS IDWOS:000250480600007
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordEMISSION-LINE PROPERTIES ; O III LAMBDA-5007 ; STELLAR OBJECTS ; ABSORPTION-SPECTRUM ; OPTICAL CATALOG ; ACTIVE NUCLEI ; ZABS GREATER ; 3C 191 ; QSO ; SYSTEMS
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Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/7018
Collection星系研究组
Corresponding AuthorLu, LZ (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Yunnan, Peoples R China.
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
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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