摘要
对于具有吸收线红移大于发射线红移的吸收体,如果吸收体具有比较大的多普勒速度,吸收体有可能是正在向类星体中心移动。在SDSS J101108+553407的光谱中认证了3个Lyα吸收体,其吸收线红移均大于发射线红移,吸收线红移分别是:3.344 2、3.349 6和3.355 3,对应的多普勒速度分别是401 km/s、773 km/s和1 166 km/s。这3个吸收体的运动情况和起源均不相同:具有最大多普勒红移的一个吸收体,可能起源于类星体物质外流的回落,而另外两个吸收体很可能起源于绕天体中心转动的云团,并且这些云团位于寄主星系中。
We have identified three Lyα absorbers with absorption-line redshifts higher than emission-line redshifts in the spectra of SDSS J101108＋553407.Except for the absorption line of Lyαλ1216,the highly ionized absorption lines（N Vλλ1238,1242,and/or C IVλ1551） have also been measured in each of the absorption systems.The absorption-line redshifts are 3.3332,3.3496,and 3.3553,respectively.The corresponding Doppler velocities are 410 km/s,773 km/s,and 1166 km/s,respectively.We also discuss the origins of the three absorbers.The absorber with the largest Doppler velocity likely originates in a cloud that is moving toward the center of quasar,but the other two absorbers may be in clouds moving around the center of quasar and lie in the host galaxy.This scenario is consistent with previous studies.
出处
《天文研究与技术》
CSCD
2013年第1期7-12,共6页
Astronomical Research & Technology
基金
广西自然科学基金面上项目(2012jjAA10090)资助
关键词
类星体
吸收线
谱线认证
Quasar
Absorption line
Identification
