期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 442, 期 2, 页码 1805-1820出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu936
关键词
galaxies: high-redshift; intergalactic medium; cosmology: observations
资金
- JSPS KAKENHI [23684010, 24244018, 23740144]
- Grants-in-Aid for Scientific Research [23684010, 23740144, 23224005] Funding Source: KAKEN
We present an updated version of the so-called Madau model for attenuation of the radiation from distant objects by intergalactic neutral hydrogen. First, we derive the distribution function of intergalactic absorbers from the latest observational statistics of the Ly alpha forest, Lyman-limit systems and damped Ly alpha systems. The distribution function reproduces the observed redshift evolution of the Ly alpha depression and the mean-free path of the Lyman continuum excellently and simultaneously. We then derive a set of analytic functions describing the mean intergalactic attenuation curve for objects at z > 0.5. The new model predicts less (or more) Ly alpha attenuation for z a parts per thousand integral 3-5 (z > 6) sources through the usual broad-band filters relative to the original Madau model. This may cause a systematic difference in the photometric redshift estimates, which is, however, still small: about 0.05. Finally, we find a more than 0.5 mag overestimation of Lyman-continuum attenuation in the original Madau model at z > 3, which causes a significant overcorrection against direct observations of the Lyman continuum of galaxies.
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