Co-variability Between the Broad Absorption Lines and Narrow Absorption Lines  

作　　者：Bo-Lin Qin Jing Li Wei-Jian Lu 覃柏霖;黎静;陆伟坚(Guangdong Country Garden School,Foshan 528312,China;Laboratory for Relativistic Astrophysics,Physical Science and Technology College,Guangxi University,Nanning 530004,China;School of Information Engineering,Baise University,Baise 533000,China)

机构地区：[1]Guangdong Country Garden School,Foshan 528312,China [2]Laboratory for Relativistic Astrophysics,Physical Science and Technology College,Guangxi University,Nanning 530004,China [3]School of Information Engineering,Baise University,Baise 533000,China

出　　处：《Research in Astronomy and Astrophysics》2024年第9期99-105,共7页天文和天体物理学研究（英文版）

基　　金：supported by the Guangxi Natural Science Foundation(No.2021GXNSFBA220044);the National Natural Science Foundation of China(No.11903002);the Research Project of Baise University(No.2019KN04)。

摘　　要：We investigate the relationship between the variability of broad absorption lines(BALs)or narrow absorption lines(NALs)and that of continuum using a data set of two-epoch SDSS spectra containing 134 C IV NAL-BAL pairs.Our analysis reveals an anti-correlation between the fractional equivalent width(EW)variations in NALs(or BALs)and the fractional flux variations of the continuum,with Spearman rank correlation coefficients of r=-0.47(p=1E-08)and r=-0.58(p=1E-13),respectively.In addition,we find a positive correlation between the fractional EW variations in NALs and BALs(r=0.72,p=1E-22),and derive a regression equation ΔEW_(NAL)/<EW_(NAL)>=0.803ΔEW_(BAL)/<EW_(BAL)>+0.008,with an intrinsic scatter of 0.14.These results suggest that the variability in the ionizing continuum may play a significant role in the observed changes in C IV NALs and BALs,supporting the idea of photoionization-driven variability.The co-variability between C IV NALs and BALs may imply that they originate from outflows with similar physical conditions.

关 键 词：(galaxies:)quasars:absorption lines (galaxies:)quasars:general galaxies:active 

分 类 号：P158[天文地球—天文学]