CosmoSpec: Fast and detailed computation of the cosmological recombination radiation from hydrogen and helium
CosmoSpec: Fast and detailed computation of the cosmological recombination radiation from hydrogen and helium
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CosmoSpec：快速、详细地计算氢和氦的宇宙复合辐射
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Y. Ali
中科院分区：
文献类型：
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作者：
J. Chluba;Y. Ali
我们提出了第一个快速和详细的计算过程中释放的氢（红移z' 1300）和氦（z' 2500和z' 6000）复合时期的宇宙复合辐射，介绍代码CosmoSpec。我们的计算包括重要的辐射传递效应，所有三个物种的500壳层束缚和自由束缚发射，电子散射和自由-自由吸收以及物种间（Heii！嘿！iii）光子反馈。后一种效应改变了复合辐射的形状和幅度，CosmoSpec比以前的处理方法有了显著的改进。利用有效的多能级原子和电导方法，一次计算在标准笔记本电脑上只需要15秒，而以前的计算需要几天。考虑到宇宙复合线的探测以及人们可能希望从三个复合时代每个氢原子发射的' 6：1光子中了解到什么，这是朝着详细预测和可行性研究迈出的重要一步。我们简要地说明了一些参数的依赖关系，并讨论剩余的不确定性，特别是有关碰撞过程和中性氦原子模型。
We present the first fast and detailed computation of the cosmological recombination radiation released during the hydrogen (redshift z’ 1300) and helium (z’ 2500 and z’ 6000) recombination epochs, introducing the code CosmoSpec. Our computations include important radiative transfer e ects, 500-shell bound-bound and free-bound emission for all three species, the e ects of electron scattering and free-free absorption as well as interspecies (Heii ! Hei ! Hi) photon feedback. The latter e ect modifies the shape and amplitude of the recombination radiation and CosmoSpec improves significantly over previous treatments of it. Utilizing e ective multilevel atom and conductance approaches, one calculation takes only’ 15 seconds on a standard laptop as opposed to days for previous computations. This is an important step towards detailed forecasts and feasibility studies considering the detection of the cosmological recombination lines and what one may hope to learn from the ’ 6:1 photons emitted per hydrogen atom in the three recombination eras. We briefly illustrate some of the parameter dependencies and discuss remaining uncertainties in particular related to collisional processes and the neutral helium atom model.
影响因子：
6.4
作者：
Prism Collaboration Philippe Andr'e;C. Baccigalupi;A. Banday;D. Barbosa;B. Barreiro;J. Bartlett;N. Bart
通讯作者：
Prism Collaboration Philippe Andr'e;C. Baccigalupi;A. Banday;D. Barbosa;B. Barreiro;J. Bartlett;N. Bart