Large-Scale Simulations of Reionization
Large-Scale Simulations of Reionization
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DOI：
10.1086/509907
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发表时间：
2005-11
期刊：
影响因子：
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通讯作者：
K. Kohler;N. Gnedin;A. Hamilton
中科院分区：
文献类型：
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作者：
K. Kohler;N. Gnedin;A. Hamilton
我们使用宇宙学模拟来探索再电离的大尺度效应。由于再电离是一个涉及大的动态范围的过程从星系到罕见的明亮类星体，我们需要能够在我们的模拟中覆盖宇宙的相当大的体积，而不丢失来自星系的重要的小尺度效应。在这里，我们已经采取了一种方法，使用来自小尺度模拟的聚集因子近似的辐射传递的亚细胞尺度。使用这种技术，我们可以覆盖的模拟大小高达1280 h-1 Mpc与10 h-1 Mpc细胞。这使我们能够构建类似于斯隆数字巡天（SDSS）类星体在高红移观测光谱的类星体合成光谱，并将它们与观测数据进行比较。然后可以分析这些光谱的H II区域大小，冈恩-彼得森槽和Lyα森林的存在。
We use cosmological simulations to explore the large-scale effects of reionization. Since reionization is a process that involves a large dynamic range—from galaxies to rare bright quasars—we need to be able to cover a significant volume of the universe in our simulation without losing the important small-scale effects from galaxies. Here we have taken an approach that uses clumping factors derived from small-scale simulations to approximate the radiative transfer on subcell scales. Using this technique, we can cover a simulation size up to 1280 h-1 Mpc with 10 h-1 Mpc cells. This allows us to construct synthetic spectra of quasars similar to observed spectra of Sloan Digital Sky Survey (SDSS) quasars at high redshifts and compare them to the observational data. These spectra can then be analyzed for H II region sizes, the presence of the Gunn-Peterson trough, and the Lyα forest.