Is the number of giant arcs in ACDM consistent with observations?
文献类型：期刊论文
| 作者 | Li, GL; Mao, S; Jing, YP; Bartelmann, M; Kang, X; Meneghetti, M |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2005-12-20 |
| 卷号 | 635期号:2页码:795-805 |
| 关键词 | cosmology : theory galaxies : clusters : general gravitational lensing methods : n-body simulations |
| 英文摘要 | We use high-resolution N-body simulations to study the galaxy-cluster cross sections and the abundance of giant arcs in the Lambda CDM model. Clusters are selected from the simulations using the friends-of-friends method, and their cross sections for forming giant arcs are analyzed. The background sources are assumed to follow a uniform ellipticity distribution from 0 to 0.5 and to have an area identical to a circular source with diameter 1". We find that the optical depth scales as the source redshift approximately as tau(1") = 2.25 x 10(-6)/[1 + (z(s)/3.14)(-3.42)] (0.6 < z(s) < 7). The amplitude is about 50% higher for an effective source diameter of 0".5. The optimal lens redshift for giant arcs with the length-to-width (L/W) ratio larger than 10 increases from 0.3 for z(s) = 1, to 0.5 for z(s) = 2, and to 0.7 - 0.8 for z(s) > 3. The optical depth is sensitive to the source redshift, in qualitative agreement with Wambsganss et al. ( 2004). However, our overall optical depth appears to be only similar to 10% - 70% of those from previous studies. The differences can be mostly explained by the different power spectrum normalizations (sigma(8)) used and different ways of determining the L/W ratio. Finite source size and ellipticity have modest effects on the optical depth. We also found that the number of highly magnified (with magnification vertical bar mu vertical bar > 10) and "undistorted'' images (with L/W < 3) is comparable to the number of giant arcs with vertical bar mu vertical bar > 10 and L/W > 10. We conclude that our predicted rate of giant arcs may be lower than the observed rate, although the precise "discrepancy'' is still unclear due to uncertainties in both theory and observations. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | REALISTIC CLUSTER POTENTIALS ; RAY-SELECTED CLUSTERS ; GALAXY CLUSTERS ; COSMOLOGICAL CONSTANT ; DARK ENERGY ; STATISTICS ; DENSITY ; UNIVERSE ; IMAGES ; EVOLUTION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000234182100005 |
| 源URL | [http://119.78.226.72/handle/331011/19370]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Univ Manchester, Jordell Bank Observ, Macclesfield SK11 9DL, Cheshire, England 3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 4.Univ Heidelberg, Zentrum Astron, ITA, D-69120 Heidelberg, Germany |
| 推荐引用方式 GB/T 7714 | Li, GL,Mao, S,Jing, YP,et al. Is the number of giant arcs in ACDM consistent with observations?[J]. ASTROPHYSICAL JOURNAL,2005,635(2):795-805. |
| APA | Li, GL,Mao, S,Jing, YP,Bartelmann, M,Kang, X,&Meneghetti, M.(2005).Is the number of giant arcs in ACDM consistent with observations?.ASTROPHYSICAL JOURNAL,635(2),795-805. |
| MLA | Li, GL,et al."Is the number of giant arcs in ACDM consistent with observations?".ASTROPHYSICAL JOURNAL 635.2(2005):795-805. |
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来源：上海天文台
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