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研究生: 譚學深
Hok-Sum Tam
論文名稱: 探索星系團中成員星系的空間分辨運動學
Exploring Spatially Resolved Kinematics of Member Galaxies in Galaxy Clusters
指導教授: 高仲明
Chung-Ming Ko
口試委員:
學位類別: 碩士
Master
系所名稱: 理學院 - 物理學系
Department of Physics
論文出版年: 2024
畢業學年度: 112
語文別: 英文
論文頁數: 97
中文關鍵詞: 星系團橢圓星系最亮星系團星系速度彌散度
外文關鍵詞: Cluster, Elliptical galaxies, Biggest cluster galaxies, Velocity dispersion
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  • 我對悉尼澳大利亞天文台(SAMI)星系巡天中的空間分辨運動學剖面進行了調查,涵蓋了 SAMI 第三輪釋出的數據中八個星系團的多目標積分視場光譜儀測量數據。我的分析集中在成員橢圓星系的一維運動學分佈,透過 IFS 檢查其內在的星系屬性。在我的初步研究中,我辨識了八個星系團中的 12 個最亮星系團星系,並將 127 個橢圓星系的速度彌散分佈分類為四個不同的組別:平坦型、下降型、上升型和不規則型。結合總恆星質量,透過 Jeans 方程式和 Hernquist 模型估算每個星系的視線速度彌散分佈。一個顯著的觀察是,許多最亮星系團星系(BCGs)主要表現出平坦的速度彌散分佈。此外,許多橢圓星系則具有下降的分佈vi


    I conducted an investigation of spatially resolved kinematic profiles within the Sydney-Australian-Astronomical-Observatory (SAMI) galaxy survey, encompassing Multi-object Integral-Field Spectrograph measurements across eight galaxy clusters in the SAMI Date Released 3. My analysis focused on the one-dimensional kinematic profiles of member elliptical galaxies, examining their intrinsic galactic properties through IFS. In my preliminary study, I identified the 12 biggest cluster galaxies within eight clusters and categorized the velocity dispersion profiles of 127 elliptical galaxies into four distinct groups: flat, declining, ascending, and irregular (or unclassified). With the total stellar mass, the line-of-sight velocity dispersion profile of each galaxy is estimated by the Jean equation with Hernquist model. A notable observation was that many brightest cluster galaxies predominantly exhibited flat velocity dispersion profiles. Also, many elliptical galaxies have declining profiles.

    Abstract --------------------------------------------------------------- vii List of Figures -------------------------------------------------------- xi List of Tables -------------------------------------------------------- xiii 1 Introduction ---------------------------------------------------------- 1 1.1 Spatially Resolved Kinematics --------------------------------------- 2 1.2 Radial Acceleration Relation ---------------------------------------- 3 1.3 Brightest Cluster Galaxies ------------------------------------------ 5 2 Data and Methodology ------------------------------------------------- 11 2.1 Overview of SAMI Galaxy Survey -------------------------------------- 11 2.2 Visual Morphology of Member Galaxies -------------------------------- 18 2.3 Stellar Velocity Dispersion of Member Elliptical Galaxies ----------- 20 2.3.1 The Velocity Dispersion Data Cube --------------------------------- 20 2.3.2 General Properties of Velocity Dispersion Map --------------------- 22 2.3.3 One-Dimensional Velocity Dispersion Profile ----------------------- 23 2.4 Velocity Dispersion Implied by Radial Acceleration Relation --------- 26 3 Result --------------------------------------------------------------- 31 3.1 Classification of Velocity Dispersion Profiles ---------------------- 31 3.2 Identifying Brightest Cluster Galaxies ------------------------------ 32 3.3 Comparison with the Implied Profiles -------------------------------- 35 4 Conclusion ------------------------------------------------------------ 41 A List of Elliptical Galaxies in SAMI ----------------------------------- 43 - B Line-of-Sight Velocity Dispersion Profiles----------------------------- 51 B.1 Brightest Cluster Galaxie ------------------------------------------- 51 B.2 Member Galaxies: Flat ----------------------------------------------- 53 B.3 Member Galaxies:: Declining ----------------------------------------- 56 B.4 Member Galaxies:: Ascending ----------------------------------------- 65 B.5 Member Galaxies: Irregular ------------------------------------------ 67 C Comparison of LOSVD of Galaxies with Models --------------------------- 69

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