The Correlated Variations of Absorption Lines and Quasar Continuum

The Correlated Variations of Absorption Lines and Quasar Continuum
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吸收线与类星体连续体的相关变化

DOI:
10.3847/1538-4365/ab2464
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发表时间:
2019-06
期刊:
Astrophysical Journal, The - Supplement Series
影响因子:
--
通讯作者:
Liu Chun-Qun
Liu Chun-Qun
中科院分区:
其他
文献类型:
--
作者:
Chen Zhi-Fu;Yi Shuang-Xi;Pang Ting-Ting;Yi Ting-Feng;Wang Zhi-Wen;Mo Xiao-Hua;Liu Chun-Qun

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利用Sloan数字巡天的类星体光谱,采用可变的Civ吸收线系统,测量了Si iv和Nv吸收线系统。我们得到了50个可变的Si iv吸收线系统和39个可变的Nv吸收线系统。我们发现,类星体的C iv、Si iv和N v吸收线的变化与类星体连续谱的变化有一定的相关性。此外,相当一部分的可变吸收线是多个系统的一致变化与大的速度分离。因此,类星体辐射的变化可能是导致吸收气体电离态或柱密度变化的主要驱动力。我们还发现,可变的C iv,Si iv和Nv吸收线系统可以分为低电离系统和高电离系统。前者对类星体亮度的变化有积极的响应,后者则相反。
Using the quasar spectra from the Sloan Digital Sky Survey and with variable C iv absorption line systems, we measure the Si iv and N v absorption line systems. We obtain 50 variable Si iv absorption line systems and 39 variable N v absorption line systems. We find that the variations in most of the C iv, Si iv, and N v absorption lines are correlated with the changes in quasar continuum. In addition, a significant portion of the variable absorption lines are the consistent variations of multiple systems with large velocity separations. Therefore, the variations of the C iv, Si iv, and N v absorption lines could be mainly driven by the changes in quasar radiations, which cause changes in ionization states or column densities of absorbing gas. We also find that the variable C iv, Si iv, and N v absorption line systems can be divided into low-ionization systems and high-ionization systems. The former positively responds to the changes in the quasar’s brightness, and the later is the oppositive case.
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