AMBER: A Semi-numerical Abundance Matching Box for the Epoch of Reionization
AMBER: A Semi-numerical Abundance Matching Box for the Epoch of Reionization
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DOI：
10.3847/1538-4357/ac5116
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发表时间：
2021-09
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影响因子：
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通讯作者：
H. Trac;Nianyi Chen;I. Holst;M. Alvarez;R. Cen
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作者：
H. Trac;Nianyi Chen;I. Holst;M. Alvarez;R. Cen
再电离时期的绝对匹配盒（AMBER）是一个模拟宇宙黎明的半数字代码。新算法不是基于再电离的偏移集理论，而是采用了一种新的方法，即假设遇到较高辐射强度的氢气较早被光电离，来计算再电离红移场zre（x）。红移值是根据给定的质量加权电离分数xi（z）与电离质量的丰度相匹配而分配的。该程序的独特优点是允许用户通过红移中点zmid、持续时间Δz和不对称性Az输入参数直接指定再电离历史。再电离过程是通过星系形成的最小晕质量Mmin和辐射传递的辐射平均自由程lmfp进一步控制的。我们实现了改进的方法来构建密度，速度，晕，辐射场，这是必不可少的组成部分建模再电离观测。我们比较琥珀与其他两个半数值方法，发现我们的代码更准确地再现辐射流体动力学模拟的结果。并行代码比辐射传输模拟快四个数量级以上，将有效地实现大体积模型，全天空模拟观测和参数空间研究。AMBER将公开提供，以促进和转变对再电离时代的研究。
The Abundance Matching Box for the Epoch of Reionization (AMBER) is a semi-numerical code for modeling the cosmic dawn. The new algorithm is not based on the excursion set formalism for reionization, but takes the novel approach of calculating the reionization-redshift field zre(x) assuming that hydrogen gas encountering higher radiation intensity are photoionized earlier. Redshift values are assigned while matching the abundance of ionized mass according to a given mass-weighted ionization fraction x¯i(z) . The code has the unique advantage of allowing users to directly specify the reionization history through the redshift midpoint z mid, duration Δz, and asymmetry A z input parameters. The reionization process is further controlled through the minimum halo mass M min for galaxy formation and the radiation mean free path l mfp for radiative transfer. We implement improved methods for constructing density, velocity, halo, and radiation fields, which are essential components for modeling reionization observables. We compare AMBER with two other semi-numerical methods and find that our code more accurately reproduces the results from radiation-hydrodynamic simulations. The parallelized code is over four orders of magnitude faster than radiative transfer simulations and will efficiently enable large-volume models, full-sky mock observations, and parameter-space studies. AMBER will be made publicly available to facilitate and transform studies of the Epoch of Reionization.