Substructure lensing: effects of galaxies, globular clusters and satellite streams
Substructure lensing: effects of galaxies, globular clusters and satellite streams
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子结构透镜：星系、球状星团和卫星流的影响
DOI：
10.1111/j.1365-2966.2010.17235.x
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发表时间：
2010-04
影响因子：
4.8
通讯作者：
Springel, V.
中科院分区：
文献类型：
--
作者：
Xu, D. D.;Mao, Shude;Cooper, Andrew P.;Wang, Jie;Gao, Liang;Frenk, Carlos S.;Springel, V.
透镜通量比异常经常被观测到，并被作为透镜星系中存在丰富暗物质子结构的证据，正如宇宙演化的冷暗物质（CDM）模型所预测的那样。在以前的工作中，我们使用一套高分辨率的N体模拟（宝瓶座模拟）研究了背景类星体被星系尺度暗物质晕透镜化的多个图像的尖焦散关系。在这项工作中，我们扩展了我们以前的计算，将重子和弥漫的黑暗成分的透镜晕。我们在每个透镜模拟中包括：（1）从应用于水瓶座晕的半分析模型中推导出的卫星星系群;（2）经验性的银河系球状星团群和（3）模拟中识别出的卫星流（漫暗分量）。占这些额外的组件，我们证实了我们早先的结论，丰富的内在子结构（暗或亮，绑定或扩散）是不足以解释所观察到的频率尖焦散违反宇宙透镜全天巡天（CLASS）。我们的结论是，所观察到的效果可能是少数统计的类，或星系际晕沿着视线作为额外的源透镜通量异常的结果。另一种可能性是，这种差异标志着清洁发展机制模式的失败。
Lensing flux-ratio anomalies have been frequently observed and taken as evidence for the presence of abundant dark matter substructures in lensing galaxies, as predicted by the cold dark matter (CDM) model of cosmogony. In previous work, we examined the cusp-caustic relations of the multiple images of background quasars lensed by galaxy-scale dark matter haloes, using a suite of high-resolution N-body simulations (the Aquarius simulations). In this work, we extend our previous calculations to incorporate both the baryonic and diffuse dark components in lensing haloes. We include in each lensing simulation: (1) a satellite galaxy population derived from a semi-analytic model applied to the Aquarius haloes; (2) an empirical Milky Way globular cluster population and (3) satellite streams (diffuse dark component) identified in the simulations. Accounting for these extra components, we confirm our earlier conclusion that the abundance of intrinsic substructures (dark or bright, bound or diffuse) is not sufficient to explain the observed frequency of cusp-caustic violations in the Cosmic Lens All-Sky Survey (CLASS). We conclude that the observed effect could be the result of the small number statistics of CLASS, or intergalactic haloes along the line of sight acting as additional sources of lensing flux anomalies. Another possibility is that this discrepancy signals a failure of the CDM model.
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DOI：
10.1086/339798
发表时间：
2001-11
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
R. Metcalf;HongSheng Zhao
通讯作者：
R. Metcalf;HongSheng Zhao
影响因子：
4.8
作者：
A. Eigenbrod
通讯作者：
A. Eigenbrod
影响因子：
6.5
作者：
T. Anguita;C. Faure;A. Yonehara;J. Wambsganss;J. Kneib;G. Covone;D. A. A. F. Astronomie-D.-A.-A.-F.-Astronomie-102469653;U. Heidelberg;Jsps Fellowships for Research Abroad;Laboratoire d'Astrophysique de Marseille;-INAF;Naples;Aim;7. CEADSM-CNRS-UniversiteParis
通讯作者：
T. Anguita;C. Faure;A. Yonehara;J. Wambsganss;J. Kneib;G. Covone;D. A. A. F. Astronomie-D.-A.-A.-F.-Astronomie-102469653;U. Heidelberg;Jsps Fellowships for Research Abroad;Laboratoire d'Astrophysique de Marseille;-INAF;Naples;Aim;7. CEADSM-CNRS-UniversiteParis
DOI：
--
发表时间：
--
期刊：
The Astrophysical Journal
影响因子：
--
作者：
A. Macciò;Xi Kang;B. Moore
通讯作者：
A. Macciò;Xi Kang;B. Moore
DOI：
10.1111/j.1745-3933.2009.00748.x
发表时间：
2009-09
影响因子：
--
作者：
T. Okamoto;Carlos S. Frenk Tsukuba;Durham
通讯作者：
T. Okamoto;Carlos S. Frenk Tsukuba;Durham