期刊
ASTRONOMY & ASTROPHYSICS
卷 441, 期 1, 页码 9-21出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20052960
关键词
cosmology : observations; line : formation; line : profiles; Galaxy : abundances; galaxies : quasars : absorption lines
A computational procedure is presented to estimate the spectral shape of the ionizing background between 1 and 10 Ryd by analyzing optically thin absorption systems in the spectra of high redshift quasars. The procedure is based on the response surface methodology from the theory of experimental design. The shape of the recovered UV background at z similar to 3 shows a significant intensity decrease between 3 and 4 Ryd compared to the metagalactic spectrum of Haardt & Madau ( 1996, ApJ, 461, 20). This decrease is interpreted as produced by He II Gunn-Peterson effect. There are no features indicating a contribution from galaxies to the UV background which is therefore dominated by QSOs at z similar to 3.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据