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Effects of dark matter substructures on gravitational lensing: results from the Aquarius simulations
文献类型：期刊论文
| 作者 | Xu, D. D.1; Mao, Shude1 ; Wang, Jie2,3; Springel, V.2; Gao, Liang3,4; White, S. D. M.2; Frenk, Carlos S.3; Jenkins, Adrian3; Li, Guoliang5; Navarro, Julio F.6
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2009-09-21 |
| 卷号 | 398期号:3页码:1235-1253 |
| 关键词 | gravitational lensing galaxies: elliptical and lenticular, cD galaxies: formation dark matter |
| 英文摘要 | We use the high-resolution Aquarius simulations of the formation of Milky Way-sized haloes in the Lambda cold dark matter cosmology to study the effects of dark matter substructures on gravitational lensing. Each halo is resolved with similar to 10(8) particles (at a mass resolution m(p) similar to 10(3) to 10(4) h(-1) M(circle dot)) within its virial radius. Subhaloes with masses m(sub) greater than or similar to 10(5) h(-1) M(circle dot) are well resolved, an improvement of at least two orders of magnitude over previous lensing studies. We incorporate a baryonic component modelled as a Hernquist profile and account for the response of the dark matter via adiabatic contraction. We focus on the 'anomalous' flux ratio problem, in particular on the violation of the cusp-caustic relation due to substructures. We find that subhaloes with masses less than similar to 10(8) h(-1)M(circle dot) play an important role in causing flux anomalies; such low-mass subhaloes have been unresolved in previous studies. There is large scatter in the predicted flux ratios between different haloes and between different projections of the same halo. In some cases, the frequency of predicted anomalous flux ratios is comparable to that observed for the radio lenses, although in most cases it is not. The probability for the simulations to reproduce the observed violations of the cusp lenses is approximate to 10(-3). We therefore conclude that the amount of substructure in the central regions of the Aquarius haloes is insufficient to explain the observed frequency of violations of the cusp-caustic relation. These conclusions are based purely on our dark matter simulations which ignore the effect of baryons on subhalo survivability. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000269731500015 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7957]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Univ Manchester, Jodrell Bank, Ctr Astrophys, Manchester M13 9PL, Lancs, England 2.Max Planck Inst Astrophys, D-85740 Garching, Germany 3.Univ Durham, Dept Phys, Inst Computat Cosmol, Durham DH1 3LE, England 4.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 5.Univ Bonn, Argelander Inst Astron, D-53121 Bonn, Germany 6.Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 5C2, Canada |
| 推荐引用方式 GB/T 7714 | Xu, D. D.,Mao, Shude,Wang, Jie,et al. Effects of dark matter substructures on gravitational lensing: results from the Aquarius simulations[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2009,398(3):1235-1253. |
| APA | Xu, D. D..,Mao, Shude.,Wang, Jie.,Springel, V..,Gao, Liang.,...&Navarro, Julio F..(2009).Effects of dark matter substructures on gravitational lensing: results from the Aquarius simulations.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,398(3),1235-1253. |
| MLA | Xu, D. D.,et al."Effects of dark matter substructures on gravitational lensing: results from the Aquarius simulations".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 398.3(2009):1235-1253. |
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来源：国家天文台
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