Smoothing algorithms and high-order singularities in gravitational lensing
文献类型：期刊论文
| 作者 | Li, Guo-Liang; Mao, S.; Jing, Y. P.; Kang, X.; Bartelmann, M. |
| 刊名 | Astrophysical journal
 |
| 出版日期 | 2006-11-20 |
| 卷号 | 652期号:1页码:43-55 |
| 关键词 | Galaxies : clusters : general Gravitational lensing |
| ISSN号 | 0004-637X |
| 通讯作者 | Li, guo-liang(lgl@center.shao.ac.cn) |
| 英文摘要 | We propose a new smoothing method for obtaining surface densities from discrete particle positions from numerical simulations. this is an essential step for many applications in gravitational lensing. this method is based on the ''scatter'' interpretation of the discrete density field in the smoothed particle hydrodynamics. we use monte carlo simulations of uniform density fields and one isothermal ellipsoid to empirically derive the noise properties and best smoothing parameters (such as the number of nearest neighbors used). a cluster from high-resolution simulations is then used to assess the reality of high-order singularities such as swallowtails and butterflies in caustics, which are important for the interpretation of substructures in gravitational lenses. we also compare our method with the delaunay tesselation field estimator using the galaxy studied by bradac et al. (2004), and we find good agreements. we show that higher order singularities are connected not only with bound subhalos but also with the satellite streams. however, the presence of high-order singularities is sensitive to not only the fluctuation amplitude of the surface density but also the detailed form of the underlying smooth lensing potential (such as ellipticity and external shear). |
| WOS关键词 | REALISTIC CLUSTER POTENTIALS ; COLD DARK-MATTER ; ARC STATISTICS ; DISK GALAXY ; LENSES ; SUBSTRUCTURE ; SIMULATIONS ; IMAGES ; HALO ; CLASSIFICATION |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000242125700004 |
| 出版者 | UNIV CHICAGO PRESS |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2379806 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Li, Guo-Liang |
| 作者单位 | 1.SHAO, JOINGC, Shanghai 200030, Peoples R China 2.USTC, Shanghai 200030, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 4.Univ Manchester, Jodrell Bank Observ, Macclesfield SK11 9DL, Cheshire, England 5.Univ Heidelberg, Zentrum Astron, ITA, D-69120 Heidelberg, Germany |
| 推荐引用方式 GB/T 7714 | Li, Guo-Liang,Mao, S.,Jing, Y. P.,et al. Smoothing algorithms and high-order singularities in gravitational lensing[J]. Astrophysical journal,2006,652(1):43-55. |
| APA | Li, Guo-Liang,Mao, S.,Jing, Y. P.,Kang, X.,&Bartelmann, M..(2006).Smoothing algorithms and high-order singularities in gravitational lensing.Astrophysical journal,652(1),43-55. |
| MLA | Li, Guo-Liang,et al."Smoothing algorithms and high-order singularities in gravitational lensing".Astrophysical journal 652.1(2006):43-55. |
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来源：中国科学院大学
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