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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/46316
Title: | 利用弱重力透鏡效應探測星系團中的暗質次結構 Weak Lensing Mass Measurement of Dark Matter Subhalos in Clusters |
Authors: | Li-Yen Hsu 徐立研 |
Advisor: | 陳丕燊(Pisin Chen) |
Keyword: | 弱重力透鏡,暗質,星系團, weak gravitational lensing,galaxy-galaxy lensing,dark matter,subhalos,clusters, |
Publication Year : | 2010 |
Degree: | 碩士 |
Abstract: | According to the cold dark matter (CDM) model, cosmic structures are formed hierarchically through a succession of mergers and accretions. Since more massive structures are merged from less massive structures, there should be some surviving dark matter substructures (subhalos) in cluster-sized dark matter halos. Numerous numerical simulations have shown that about (5-20)% of the total mass of a cluster is contributed by these subhalos. In addition, the size and mass of subhalos depend strongly on the cluster-centric radius due to the tidal force induced by the host halo. Therefore, the comparison between observation of subhalos properties and the simulation prediction is important, in order to gain a deeper understanding of the growth and evolution of the clusters. Here we present the technique of galaxy-galaxy lensing using both the N-body simulation and the observational data in order to explore substructures in cluster halos. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/46316 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 物理學系 |
Files in This Item:
File | Size | Format | |
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ntu-99-1.pdf Restricted Access | 1.63 MB | Adobe PDF |
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