宽吸收线消失的类星体光变研究

发布时间：2018-05-02 09:01

本文选题：类星体 + 宽吸收线　；参考：《南京师范大学》2014年硕士论文

【摘要】：宽吸收线类星体(BAL QSOs)中宽吸收线坑(BAL trough)的变化是比较常见的,但BAL坑消失的现象比较罕见。本文利用了SDSS巡天数据研究这类BAL坑消失的BAL QSOs的光谱光变。该论文分三章。第一章为研究背景,介绍了活动星系核(AGN)基本特征及统一模型、BAL QSOs及其光变研究进展；第二章介绍了自己的研究工作。第三章为结论与展望。利用Filiz Ak等人的样本,我们探讨了19个CIV BAL坑消失的最大BALQSOs样本的多历元光谱光变,红移范围1.71z2.57,时间跨度1.1-3.9年(静止系)。具体研究了这些QSOs的BAL等值宽度变化、光度变化和谱指数变化之间关系,发现： (1) CIV BAL等值宽度的变化与1700A处的光度变化没有明显相关性,但是发现,在BAL坑消失时,大多数源变亮。 (2)随着坑的CIV BAL的消失,约一半源的光谱变蓝,蓝端变陡。 (3) CIV BAL消失的时标在1000天左右。 (4)对这些较高红移的坑消失QSOs,随着源的增亮,仅有约一半的源的谱指数变蓝,这与其他高红移QSOs的光谱光变行为一致。
[Abstract]:The changes of BAL trough ( BAL trough ) in the wide absorption line quasar are more common , but the disappearance of BAL pit is rare . In this paper , SDSS patrol data is used to study the spectral light change of BAL Qishan which has disappeared from the BAL pit . Chapter 1 is the research background , and introduces the basic features and uniform model of active galactic nuclei ( AGN ) and the research progress of BAL Q.
The second chapter introduces its research work . The third chapter is the conclusion and prospect .

Based on the samples of Filiz Ak et al . , we discussed the multi - epoch spectral variability of the largest BALQLI samples that disappeared from 19 CIV BAL pits , the red shift range was 1.71z2 . 57 , the time span was 1.1 - 3.9 years ( stationary system ) .

( 1 ) There was no significant correlation between the change of the constant width of the CIV BAL and the change in luminosity at 1700 A , but it was found that most of the sources became brighter when the BAL pit disappeared .

( 2 ) With the disappearance of CIV BAL in the pit , about half of the source spectra became blue and the blue end became steeper .

( 3 ) The disappearance of CIV BAL is about 1000 days .

( 4 ) The spectral index of these higher red shifted pits disappeared , and the spectral index of only about half of the source was blue with the increase of the source , which was consistent with the spectral luminous behavior of other high red shifted pits .

【学位授予单位】：南京师范大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P158

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