The redshift distribution of Ly-alpha clouds and the proximity effect
The redshift distribution of Ly-alpha clouds and the proximity effect
复制标题
Ly-alpha云的红移分布与邻近效应
DOI：
10.1086/169598
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
D. Turnshek
中科院分区：
文献类型：
--
作者：
Limin Lu;A. Wolfe;D. Turnshek
从38个类星体光谱中获得了950条Ly-Alpha林线的相对均匀样本。红移指数伽马为2.37+或-0.26，可以用来描述Ly-α森林云的演化，如果数据用单一的幂定律来描述。然而，当考虑邻近效应时，伽马的相对论数值为2.75+或-0.29。我们证实，确实有统计上显著的证据证明，在类星体发射红移附近有更少的谱线，从而产生了相反的效应。相反的效应可以解释为附近的类星体导致氢云的电离增强所引起的邻近效应，前提是这些云是高度电离的。Z在1.7和3.8之间的背景平均强度估计为-21.0+或-0.5。邻近效应与类星体的射电性质之间没有明显的关联。文中还讨论了产生逆效应的原因。参考文献49。
A relatively homogeneous sample of 950 Ly-alpha forest lines has been formed from 38 QSO spectra. A redshift index gamma of 2.37 + or - 0.26 is found to describe the evolution of the Ly-alpha forest clouds if the data are parameterized by a single power law. A more relativistic value for gamma of 2.75 + or - 0.29, however, is obtained when the proximity effect is taken into consideration. It is confirmed that there is indeed statistically significant evidence for the inverse effect in the sense that there are fewer lines near QSO emission redshifts. The inverse effect can be explained as a proximity effect caused by the enhanced ionization of hydrogen clouds due to the nearby QSO, provided that the clouds are highly ionized. The background mean intensity at z between 1.7 and 3.8 is estimated to be -21.0 + or - 0.5. No significant correlation is found between the proximity effect and the radio properties of the QSOs. Explanations for the inverse effect are discussed. 49 refs.