A subset of quasars identified by large values of their Doppler redshift
文献类型：期刊论文
| 作者 | Lv LZ(吕连忠)1,2,3; Tan YP(覃一平)2,4 ; A. C. Gupta1
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2007-11-01 |
| 卷号 | 669期号:1页码:74-84 |
| 关键词 | catalogs methods : statistical quasars : absorption lines quasars : emission lines quasars : general |
| ISSN号 | 0004-637X |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Lu, LZ (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Yunnan, Peoples R China. |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | 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 |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/0004-637X/669/1/74/ |
| 语种 | 英语 |
| WOS记录号 | WOS:000250480600007 |
| 公开日期 | 2016-05-03 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/7018]  |
| 专题 | 云南天文台_星系研究组 |
| 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 |
| 推荐引用方式 GB/T 7714 | Lv LZ,Tan YP,A. C. Gupta. 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.(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. |
入库方式： OAI收割
来源：云南天文台
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