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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳丕燊(Pisin Chen) | |
| dc.contributor.author | Li-Yen Hsu | en |
| dc.contributor.author | 徐立研 | zh_TW |
| dc.date.accessioned | 2021-06-15T05:03:13Z | - |
| dc.date.available | 2010-08-04 | |
| dc.date.copyright | 2010-08-04 | |
| dc.date.issued | 2010 | |
| dc.date.submitted | 2010-07-27 | |
| dc.identifier.citation | References
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/46316 | - |
| dc.description.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. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T05:03:13Z (GMT). No. of bitstreams: 1 ntu-99-R97222031-1.pdf: 1668173 bytes, checksum: 960e3710cd4c4a2c478fbdf5daef1942 (MD5) Previous issue date: 2010 | en |
| dc.description.tableofcontents | Contents
1 Introduction 13 1.1 Our Universe............................... 13 1.2 Structure of the Universe......................... 14 1.2.1 Observational Evidence of Dark Matter............. 14 1.2.2 Lambda Cold Dark Matter Model................ 16 1.2.3 Galaxy Cluster.......................... 17 1.2.4 Dark Matter Subhalos in Clusters................ 18 1.3 Objective of this Research........................ 19 2 Cosmological and Astronomical Background 21 2.1 FRW Model................................ 21 2.1.1 Redshift.............................. 22 2.2 Cosmological Distance.......................... 23 2.3 K-correction................................ 25 3 Weak Gravitational Lensing 27 3.1 Introduction................................ 27 3.2 Basic Equations of Gravitational Lensing............... 28 3.2.1 Lens Equation........................... 28 3.2.2 Cluster Gravitational Lensing.................. 31 3.2.3 Lensing Jacobian Matrix..................... 32 3.2.4 Lensing Convergence and Shear................. 33 3.3 Weak Gravitational Lensing....................... 34 3.3.1 Weak Lensing Distortion Observables.............. 34 3.3.2 Inversion Formula between Lensing Convergence and Shear.. 36 3.4 Cluster Mass Reconstruction....................... 37 3.4.1 Weak Lensing Distortion Pro les................ 37 3.4.2 Weak Lensing Dilution E ect.................. 40 3.4.3 The NFW Lens Model...................... 40 3.5 Subhalo Lensing - Galaxy-Galaxy Lensing............... 42 3.6 Inclusion of Cluster Lensing E ect in Subhalo Lensing........ 43 4 Probing Subhalo Mass through Weak Lensing 47 4.1 N-body Simulation Test of Measuring Substructures.......... 47 4.1.1 Data and Lensing Simulation.................. 47 4.1.2 Method.............................. 49 4.1.3 Results............................... 52 4.2 Observations................................ 55 4.3 Methodology of Observational Data Analysis.............. 56 4.3.1 Mass................................ 56 4.3.2 Luminosity............................ 59 5 Results 62 6 Discussion and Summary 73 6.1 Tidal Radius............................... 73 6.2 Radial Dependence............................ 74 6.3 Comparison with Earlier Studies..................... 75 6.4 Subhalo Mass Fraction.......................... 76 6.5 Problems and Possible Solutions..................... 81 6.6 Summary................................. 82 References 83 | |
| dc.language.iso | zh-TW | |
| dc.subject | 星系團 | zh_TW |
| dc.subject | 弱重力透鏡 | zh_TW |
| dc.subject | 暗質 | zh_TW |
| dc.subject | weak gravitational lensing | en |
| dc.subject | clusters | en |
| dc.subject | subhalos | en |
| dc.subject | dark matter | en |
| dc.subject | galaxy-galaxy lensing | en |
| dc.title | 利用弱重力透鏡效應探測星系團中的暗質次結構 | zh_TW |
| dc.title | Weak Lensing Mass Measurement of Dark Matter Subhalos in Clusters | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 98-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.coadvisor | 梅津敬一(Keiichi Umetsu) | |
| dc.contributor.oralexamcommittee | 闕志鴻,麥善德(Sandor Molnar) | |
| dc.subject.keyword | 弱重力透鏡,暗質,星系團, | zh_TW |
| dc.subject.keyword | weak gravitational lensing,galaxy-galaxy lensing,dark matter,subhalos,clusters, | en |
| dc.relation.page | 86 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2010-07-28 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 物理研究所 | zh_TW |
| 顯示於系所單位： | 物理學系 | |
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