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姓名 黃仁昭(Jen-Chao Huang) 查詢紙本館藏 畢業系所 天文研究所 論文名稱 對型態確認的合併星系之光度研究
(Photometric Study of Morphologically Identified Merging Galaxies)相關論文 檔案 [Endnote RIS 格式] [Bibtex 格式] [相關文章] [文章引用] [完整記錄] [館藏目錄] [檢視] [下載]
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摘要(中) 本研究是針對合併星系的光度性質進行探討。我們採用的合併星系樣本是利用圖形辨識程式從紅序列星系團巡天二號計畫(Red Sequence Cluster Survey 2)中所挑選出來的。我們發展了一套針對不規則天體的測光孔徑技術,並利用這個技術在紅序列星系團巡天二號計畫中已有的三個波段影像測量這些合併星系的光度。我們模擬了幾種已知的星系光譜在不同紅移下可能展現的色指數(Color)並與測量到的光度資訊比對來找出這些合併星系的可能類型。透過研究我們發現在相對高紅移處我們觀測到的合併星系其色指數多半比較類似橢圓星系。我們的其他結果也暗示了因為星系交互作用所導致的恆星形成活動應該要發生在交互作用過程相對晚期的時候。
摘要(英) We investigate the photometric properties of the merging galaxies that were identified morphologically in the Red Sequence Cluster Survey 2 (RCS2) in 381 square degrees. We develop and apply an adaptive aperture photometry technique to retrieve all the available passband photometry from the RCS2 images. We also develop a color-color classification method by referring a set of empirical galaxy SED templates to study the color properties of these merging galaxies. We find that we have observed more red ellipticall-like mergers at relative high redshifts. Our result also suggests that the triggering star-formation activities may happen at later stage of galaxy interaction.
關鍵字(中) ★ 光度測量
★ 交互作用星系
★ 合併星系關鍵字(英) ★ Photometry
★ Interacting Galaxies
★ Merging Galaxies論文目次 1 Introduction . . . . . . . . 1
1.1 Merging/Interaction Galaxies . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Searching Merging Galaxies . . . . . . . . . . . . . . . . . . . . . . . 2
2 Adaptive Aperture Photometry . . . . . . . . 5
2.1 Images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Adaptive Aperture Photometry . . . . . . . . . . . . . . . . . . . . . 6
2.2.1 Background Subtraction . . . . . . . . . . . . . . . . . . . . . 7
2.2.2 Adaptive Aperture . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2.3 Computing the magnitude . . . . . . . . . . . . . . . . . . . . 12
2.3 SDSS data comparison . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.4 Galactic extinction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3 Classi cation Method . . . . . . . . 16
3.1 Color simulation of highly redshifted galaxies . . . . . . . . . . . . . . 16
3.2 Colors of SDSS galaxies . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.3 Color-color classification . . . . . . . . . . . . . . . . . . . . . . . . . 22
4 Result and Discussion . . . . . . . . 24
4.1 Aperture Photometric Result . . . . . . . . . . . . . . . . . . . . . . 24
4.2 Color properties of the mergers . . . . . . . . . . . . . . . . . . . . . 25
4.3 ”Extreme Blue” merging galaxies . . . . . . . . . . . . . . . . . . . . 28
4.4 Accuracy of our color method . . . . . . . . . . . . . . . . . . . . . . 30
5 Conclusion . . . . . . . . 32
6 Bibliography . . . . . . . . 33
A Lsit of first 100 mergers with photometry information . . . . . . . . 36
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指導教授 黃崇源(Chorng-Yuan Hwang) 審核日期 2011-7-12 推文 facebook plurk twitter funp google live udn HD myshare reddit netvibes friend youpush delicious baidu 網路書籤 Google bookmarks del.icio.us hemidemi myshare