天文学进展2025，Vol.43Issue(1)：157-177,21.DOI:10.3969/j.issn.1000-8349.2025.01.10
类星体强引力透镜Mg Ⅱ λλ2796,2803窄吸收线系统证认
Identification of Mg Ⅱ λλ2796,2803 Narrow Absorption Line Systems in the Spectra of Strongly Lensed Quasars
摘要
Abstract
Based on the Sloan Digital Sky Survey(SDSS)Quasar Lens Search(SQLS)data,21 strong gravitational lensing quasar sources with at least two images were selected,with their spectral redshift ranging from 1.01856 to 2.91598.Using the latest SDSS DR18 spectral data,Mg Ⅱ λλ2796,2803 narrow absorption line systems were searched for in the observational wavelength range of 3800∼9200˚A.By normalizing the two spectra separately and fitting the absorption lines,42 Mg Ⅱ λλ narrow absorption line systems were identified,with their absorption line redshift zabs ranging from 0.4146 to 1.9418.The study found that 81%(17/21)of the zabs are approximately equal to or fall within the range of the lensing galaxy redshift z1 or the intervening galaxy redshift z estimated by other researchers.There-fore,the identification of Mg Ⅱ λλ2796,2803 narrow absorption line systems can effectively reveal details that may affect the lensing effect along the line of sight,which is of great significance for the search of strong gravitational lensing quasar candidate systems and the estimation of lensing galaxy redshifts.关键词
类星体/透镜红移/窄吸收线系统Key words
quasar/lens redshift/narrow absorption line system分类
天文学引用本文复制引用
潘彩娟,杨婕,韦相龙..类星体强引力透镜Mg Ⅱ λλ2796,2803窄吸收线系统证认[J].天文学进展,2025,43(1):157-177,21.基金项目
国家自然科学基金(12463003) （12463003）
广西自然科学基金(2025GXNSFAA069632) （2025GXNSFAA069632）
