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研究生： 林依梵
Yi-fan Lin
論文名稱： Investigating the y-Band Images of Merging Galaxies
指導教授： 黃崇源
口試委員:
學位類別： 碩士
Master
系所名稱： 理學院 - 天文研究所
Graduate Institute of Astronomy
論文出版年： 2014
畢業學年度： 102
語文別： 英文
論文頁數： 59
中文關鍵詞： 合併星系 、星系 、恆星質量
外文關鍵詞： SDSS, Pan-STARRS, stellar mass
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    • 本研究是使用泛星計畫(Panoramic Survey Telescope & Rapid Response System，簡稱Pan-STARRS)的y波段觀測來探討合併星系的性質。這些合併星系是來自於合併星系目錄，該目錄是由Hwang & Chang (2009) 所製作的，他們使用了紅序列星系團巡天二號計畫(Red-sequence Cluster Survey 2)所拍攝的影像找出了約莫一萬五千個合併星系，而我們將對這一萬多個合併星系進行測光的流程。我們使用由Huang & Hwang (2014) 所研發的不規則天體孔徑測光方法對這些合併星系做測光，得到初步的測光結果，接著使用史隆數位巡天計畫(SDSS)來做校正，進而得到準確的測光結果。我們使用校正過的測光資料去計算合併星系的恆星質量，得到這些合併星系的恆星質量約莫是介在1010到1012個太陽質量之間，因此我們更新了合併星系目錄，並且紀錄合併星系在y波段下的結果。

    We study the y′−band images of merging galaxies from the observations of the Panoramic Survey Telescope & Rapid Response System (Pan-STARRS). The merging systems were selected from the merging catalog of Hwang & Chang (2009),
    which were identified by checking the images of the Red-sequence Cluster Survey 2from the observations of the Canada France Hawaii Telescope (CFHT). By using a
    homomorphic-aperture method developed by Huang & Hwang (2014), we determine the photometric results of these merging systems. To obtain results with accurate photometry, we calibrated the r′−, z′−,and y′−band data to match the results of the SDSS DR9. We used the calibrated y′−band data to investigate the stellar mass of merging galaxies. Our results show that the stellar mass of merging galaxies are about 10^10 to 10^12M⊙. We also created a new catalog to record the y′−band results of the merging galaxies.

    1 Introduction 1 1.1 Merging Galaxies . . . . . . . . . . . . . . . . . . 1 1.2 Luminosity and Stellar Mass . . . . . . . . . . . . 3 2 Data Reduction and Analysis 6 2.1 Sample . . . . . . . . . . . . . . . . . . . 6 2.1.1 Merging Galaxy Catalog . . . . . . . . . . . . . . . . . . . . . 6 2.1.2 Images from Pan-STARRS . . . . . . . . . . . . . . . . . . . . 7 2.2 The Photometric Process . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2.1 Clean Images . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2.2 Binary Images . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2.3 Adaptive Aperture . . . . . . . . . . . . . . . . . . . . . . . . 10 2.2.4 Instrument Magnitude . . . . . . . . . . . . . . . . . . . . . . 13 2.3 Calibraiotn with SDSS . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3 Result 18 3.1 The Relation Between y Band and Stellar Mass . . . . . . . . . . . . 18 3.2 Stellar Mass of Merging Galaxies . . . . . . . . . . . . . . . . . . . . 22 3.2.1 Spectrum-z versus Photo-z . . . . . . . . . . . . . . . . . . . . 22 3.2.2 Stellar Mass Estimated Using Spectrum-z Data . . . . . . . . 24 3.2.3 Stellar Mass Estimated Using Photo-z Data . . . . . . . . . . 28 3.3 Properties of the Merger Candidates . . . . . . . . . . . . . . . . . . 35 4 Discussion 41 4.1 Evolution of Merging Galaxies . . . . . . . . . . . . . . . . . . . . . . 41 4.2 DVO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 5 Summary 48 A Photometric Results with 100 Merging Galaxies 52 B Stellar mass of merging galaxies 56 i

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