类星体高分辨率光谱中Lyα森林的演化  

Evolution of Lyα Forest in High-resolution Spectroscopy of QSOs

作　　者：蒋耀妹[1] 平一鼎[2] 

机构地区：[1]南京工程学院基础部,江苏南京211167 [2]中国科学院紫金山天文台,江苏南京210008

出　　处：《南京工程学院学报（自然科学版）》2007年第3期1-7,共7页Journal of Nanjing Institute of Technology(Natural Science Edition)

摘　　要：收集来自文献的19个类星体的高分辨率光谱资料,构成一个较大的样本,计算了Lyα森林的演化指数γ值,以考察Lyα森林的线密度的演化,并讨论了演化与红移、等值宽度阈值之间的关系.结果表明,在所选样本中,演化是明显的,在各等值宽度区间内的演化与以往的结果基本一致.High-resolution spectral data regarding some 19 QSOs was colleted, which served as a sufficient sample. The evolution index y was calculated to study the evolution of line density of Lyα forest. This paper also discusses the relationship between the evolution with red shift and threshold of equivalent width. The results show that the evolution is in evidence in the sample and the evolution in every equivalent width is essentially identical with the results of the previous research.

关 键 词：类星体 Lyα森林 演化 

分 类 号：P142[天文地球—天体物理]