Investigating lensing by absorbers in the 2dF-quasar survey
文献类型：期刊论文
| 作者 | Menard, B; Peroux, C |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2003-10-01 |
| 卷号 | 410期号:1页码:33-+ |
| 关键词 | cosmology : observations quasars : absorption lines cosmology : gravitational lensing surveys |
| 英文摘要 | We use the first data release of the 2-degree Field quasar survey to investigate the effect of gravitational magnification by foreground absorbing systems on background quasars. We select two populations of quasars from this sample: one with strong Mg II/Fe II absorbers and one without. The selection is done in such a way that the two populations have the same redshift distribution and the absorber detection procedure discards possible biases with quasar magnitude. We then compare their magnitude distributions and find a relative excess of bright quasars with absorbers. This effect is detected at the 2.4, 3.7 and 4.4sigma levels in u-, b- and r-bands. Various explanations of the observed phenomenon are considered and several lines of evidence point towards gravitational lensing causing some of the differences observed in the magnitude distributions. We note that physical quasar-absorber associations may contribute to some extent to the observed correlations for low quasar-absorber velocity differences. We discuss the implications of these findings and propose future work which will allow us to strengthen and extend the results presented here. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | QSO REDSHIFT SURVEY ; LY-ALPHA ABSORBERS ; ABSORPTION-SELECTED GALAXIES ; QUASI-STELLAR OBJECTS ; LINE SYSTEMS ; 10K CATALOG ; EVOLUTION ; GAS ; SPECTRA ; DENSITY |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000185708200004 |
| 源URL | [http://119.78.226.72/handle/331011/18262]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Max Planck Inst Astrophys, D-85741 Garching, Germany 2.Inst Astrophys Paris, F-75014 Paris, France 3.CAS, Shanghai Astron Observ, Shanghai 200030, Peoples R China 4.Osserv Astron Trieste, I-34131 Trieste, Italy |
| 推荐引用方式 GB/T 7714 | Menard, B,Peroux, C. Investigating lensing by absorbers in the 2dF-quasar survey[J]. ASTRONOMY & ASTROPHYSICS,2003,410(1):33-+. |
| APA | Menard, B,&Peroux, C.(2003).Investigating lensing by absorbers in the 2dF-quasar survey.ASTRONOMY & ASTROPHYSICS,410(1),33-+. |
| MLA | Menard, B,et al."Investigating lensing by absorbers in the 2dF-quasar survey".ASTRONOMY & ASTROPHYSICS 410.1(2003):33-+. |
入库方式： OAI收割
来源：上海天文台
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