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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳丕燊(Pisin, Chen) | |
| dc.contributor.author | Yu-Yen Chang | en |
| dc.contributor.author | 張雨晏 | zh_TW |
| dc.date.accessioned | 2021-06-15T05:06:10Z | - |
| dc.date.available | 2012-07-28 | |
| dc.date.copyright | 2010-07-28 | |
| dc.date.issued | 2010 | |
| dc.date.submitted | 2010-07-27 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/46379 | - |
| dc.description.abstract | 我們研讀了星系的參數，並且尋找這些參數間的關係。我們的樣本來自阿雷西波無線電波望遠鏡中的L波段饋入陣列 (ALFALFA)，以及澳洲帕可斯天文台無線電望遠鏡的中性氫巡天計畫 (HIPASS)。從這兩座電波望遠鏡的資料庫，我們可以得到星系的中性氫含量和動態資訊。並且加上史隆數位巡天計畫 (SDSS)所得到的光學特性，和二微米巡天計畫 (2MASS)所得到的近紅外光特性，對於星系的參數做近一步的研究。我們使用主成份分析 (PCA)尋找觀測參數間的關係。我們的目標是了解星系的結構和及暗質在星系形成和星系動力學所伴演的角色。我們證實了2008年迪士尼等人刊登在自然期刊的研究成果，也就是，除了顏色以外，其他五個觀測參數彼此間有很強的關係。透過主成份分析，我們更可以找到足以代表這些參數的一個主成份。這樣的結果暗示著，只需要有一個物理的參數，就可以決定星系的動力學及結構。我們討論了這個結果在暗質理論中的含意。 | zh_TW |
| dc.description.abstract | We have studied global parameters of galaxies to find simple relationships among them. We use database from the Arecibo Legacy Fast Arecibo L-band Feed Array (ALFALFA) and HI Parkes All-Sky Survey for the atomic gas properties and dynamics, with the Sloan Digital Sky Survey (SDSS) for the optical properties of galaxies, and the Two Micron All Sky Survey for the near-infrared properties. We conduct Principal Component Analyses (PCA) to find relations among observational variables. The goal is to gain insight into the structure of galaxies and to infer the role of dark matter in galaxy formation and galactic dynamics. We confirm the recent finding of Disney et al. (Nature, 2008) with a much larger number of samples. That is, except the color, the other 5 parameters are correlated and are governed by just one principal component. This implies that only one physical parameter can in principle determine all the observed dynamics and structure of the galaxies. We discuss the implication of this result on the cold dark matter. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T05:06:10Z (GMT). No. of bitstreams: 1 ntu-99-R96942019-1.pdf: 11332041 bytes, checksum: fb24ced5df37ce360e1932677fcd6fba (MD5) Previous issue date: 2010 | en |
| dc.description.tableofcontents | Acknowledgement I
Abstract (Chinese) II Abstract (English) III Contents IV List of Figures VI List of Tables VIII 1 Introduction 1 2 A Brief Introduction to Cosmology 3 2.1 Our Universe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2 Dark Matter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2.1 Observational Evidence . . . . . . . . . . . . . . . . . . . . . . 4 2.2.2 Lambda Cold Dark Matter Model . . . . . . . . . . . . . . . . 7 2.2.3 Other Dark Matter Candidates . . . . . . . . . . . . . . . . . 8 2.3 Hierarchical Structure Formation . . . . . . . . . . . . . . . . . . . . 8 2.3.1 Galactic Scale Evolution of Structure . . . . . . . . . . . . . . 9 3 Observational Consideration 12 3.1 Radio Astronomy and HI 21cm Spectrum . . . . . . . . . . . . . . . . 13 3.2 Optical Observation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.3 Near-Infrared Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4 Database and Variables 15 4.1 Database . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.1.1 ALFALFA: Arecibo Legacy Fast Arecibo L-band Feed Array . 15 4.1.2 HIPASS: HI Parkes All-Sky Survey . . . . . . . . . . . . . . . 16 4.1.3 SDSS: Sloan Digital Sky Survey . . . . . . . . . . . . . . . . . 16 4.1.4 2MASS: Two Micron All Sky Survey . . . . . . . . . . . . . . 17 4.2 Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.2.1 Half-light Radius (R50) . . . . . . . . . . . . . . . . . . . . . . 19 4.2.2 90%-light Radius (R90) . . . . . . . . . . . . . . . . . . . . . . 20 4.2.3 HI Mass (MHI) . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.2.4 Dynamical Mass (Md) . . . . . . . . . . . . . . . . . . . . . . 21 4.2.5 Luminosity (L) . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.2.6 Color . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5 Principal Component Analysis 23 5.1 Calculate Principal Components . . . . . . . . . . . . . . . . . . . . . 23 5.2 Criterions of PCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 6 Results 27 6.1 Statistics and Correlations . . . . . . . . . . . . . . . . . . . . . . . . 27 6.2 PCA Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 6.3 Disk and Spheroid Galaxies . . . . . . . . . . . . . . . . . . . . . . . 35 6.4 Comparison with the Known Relations . . . . . . . . . . . . . . . . . 37 6.5 The Most Uncorrelated Variable: Color . . . . . . . . . . . . . . . . . 39 7 Summary and Discussion 40 A Appendix A: Use ALFALFA/HIPASS as our samples 42 A.1 Statistics and Correlations . . . . . . . . . . . . . . . . . . . . . . . . 43 A.2 PCA Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 A.3 Disk and Spheroid Galaxies . . . . . . . . . . . . . . . . . . . . . . . 46 | |
| dc.language.iso | en | |
| dc.subject | 主成份分析 | zh_TW |
| dc.subject | 冷暗質 | zh_TW |
| dc.subject | 中性氫巡天 | zh_TW |
| dc.subject | 階層性結構形成 | zh_TW |
| dc.subject | 星系 | zh_TW |
| dc.subject | cold dark matter | en |
| dc.subject | principal component analysis | en |
| dc.subject | hierarchical structure formation | en |
| dc.subject | HI survey | en |
| dc.subject | galaxies | en |
| dc.title | 星系參數間的相關性及暗質在結構形成的角色 | zh_TW |
| dc.title | The Correlation between Global Parameters
of Galaxies and its Implications on the Role of Dark Matter in Structure Formation | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 98-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.coadvisor | 王為豪(Wei-Hao Wang) | |
| dc.contributor.oralexamcommittee | 林俐暉(Li-Hwai Lin),闕志鴻(Tzihong Chiueh) | |
| dc.subject.keyword | 星系,中性氫巡天,階層性結構形成,冷暗質,主成份分析, | zh_TW |
| dc.subject.keyword | galaxies,HI survey,hierarchical structure formation,cold dark matter,principal component analysis, | en |
| dc.relation.page | 62 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2010-07-27 | |
| 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 | |
文件中的檔案：
| 檔案 | 大小 | 格式 | |
|---|---|---|---|
| ntu-99-1.pdf 未授權公開取用 | 11.07 MB | Adobe PDF |
系統中的文件，除了特別指名其著作權條款之外，均受到著作權保護，並且保留所有的權利。