Color Variabilities of QSOs at z = 0.3 - 1.2

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姓名

陸勇志(Loke, Young Tzee) 查詢紙本館藏

畢業系所

天文研究所

論文名稱

(Color Variabilities of QSOs at z = 0.3 - 1.2)

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摘要(中)

我們研究了類星體的顏色變化的特性。我們交叉比對史隆數位化巡 (SDSS) 所釋出的第七版資料 (DR 7) 和第十二版資料 (DR 12) 的類星體目錄，選出 608 個在兩個版本都有觀測資料且紅移在 0.3 到 1.2 之間的類星體。我們選用在靜止坐標系下 3000 埃與 4000 埃的光通量密度比值來定義顏色值。我們透過比較兩個版本類星體的顏色值來定義顏色變化。我們發現在靜止坐標系下，類星體的顏色變化分佈類似常態分佈，但部分類星體在數年的時間尺度下有著明顯的顏色變化。另外，我們還發現了八個類星體的光譜變化可以被塵埃紅化現象來解釋。我們的結果也顯示了類星體的顏色變化可能存在多個物理機制。

摘要(英)

We investigate the color variabilities of QSOs at z = 0.3 – 1.2. We selected the sample of 608 QSOs, which have multi-epoch spectra in both the Sloan Digital Sky Survey (SDSS) Data Released 7 (DR7) and Data Released 12 (DR12). We defined the spectral color ofthe QSOs by the ratio of flux densities of 3000 Å to 4000 Å in the rest frame. In each sample, the color variability is defined by the differences of color in DR7 and DR12.We find that the color variabilities show a Gaussian distribution with some QSOs displaying significant color changes within the timescale of a few years. We find that the spectral variabilities of eight color-change QSOs could be explained by dust reddening. Our results also show that the color variabilities of QSOs might originate from more than one physics mechanisms.

關鍵字(中)

★ 類星體
★ 活躍星系核
★ 星系

關鍵字(英)

★ QSO
★ AGN
★ Galaxy

論文目次

摘要 vii
Abstract ix
Contents xi
List of Figures xiii
1 Introduction 1
1.1 Active Galactic Nucleus....................................................... 1
1.2 Unification model ............................................................. 2
1.3 Subclass of QSOs.............................................................. 3
1.4 Red QSOs ..................................................................... 4
1.5 Variabilities of QSOs.......................................................... 4
2 Sample Selection 7
2.1 Spectroscopic Data............................................................ 7
2.2 Sample Selection and Defi nition of the Color ................................ 8
2.3 Defi nition of Color-change QSOs ............................................. 9
3 Results 11
3.1 Redshift Distribution of Color-change QSOs ................................. 11
3.2 Time Distribution of Color-change QSOs .................................... 13
3.3 Color of QSOs................................................................. 14
4 Discussions 25
4.1 Host Galaxy Contamination .................................................. 25
4.2 Dust reddening of the QSOs continuum...................................... 26
4.3 The intrinsic variabilities of QSOs............................................ 33
5 Conclusion 35
Bibliography 37
A Information of the selected QSOs 39
B Spectra of the color-change QSOs 61
C Example spectra of the controlled QSOs 69

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指導教授

黃崇源(Chorng-Yuan Hwang)

審核日期

2019-8-19

推文