A Spectroscopic Study of UM 673 A and B: On the Size of Lyman-Alpha Clouds
A Spectroscopic Study of UM 673 A and B: On the Size of Lyman-Alpha Clouds
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UM 673 A 和 B 的光谱研究：关于莱曼-阿尔法云的大小
DOI：
10.1086/171187
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
P. Magain
中科院分区：
文献类型：
--
作者：
A. Smette;J. Surdej;P. Shaver;C. Foltz;F. Chaffee;R. Weymann;Robert Williams;P. Magain
本文研究了引力透镜高红移类星体UM 673的Lyα森林谱（2 A分辨率）A和B像。最亮（A）图像的更高分辨率数据也被呈现。在2 A分辨率光谱中，在较暗的B图像的光谱中在5 σ处检测到的所有吸收线都存在于A图像中;然而，发现两个反符合，即，A中的两条线在B中没有对应线，置信水平超过3 σ。假设A和B光谱中相应的Lyα线具有很好的相关性，这证明两个光束实际上穿过相同的云
A study of the Lyα forest spectra (2 A resolution) obtained for the A and B images of the gravitationally lensed high-redshift quasar UM 673 is presented. Higher resolution data of the brightest (A) image are also presented. In the 2 A resolution spectra, all the absorption lines detected at 5 σ in the spectrum of the fainter B image are present in the A image; however, two anticoincidences are found, i.e., two lines in A which do not have a counterpart in B at more than a 3 σ confidence level. Given the fact that corresponding Lyα lines in the spectra of A and B have their equivalent widths well correlated, this proves that both light beams actually cross the same clouds