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Spectra from the forming region of the first galaxies: The effect of aspherical deceleration

机译：来自第一个星系形成区域的光谱：非球面减速的影响

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Lyalpha line emission from the Loeb-Rybicki (LR) halo, which is the expanding H I intergalactic medium (IGM) around the first star clusters and the ionized interstellar medium, is investigated by solving a radiative transfer problem. While the initial scattering optical depth is similar to10(5) for the Lyalpha photons, most of the Lyalpha photons can escape when the cumulative frequency-shift due to the expansion of the H I IGM becomes significantly large. The current paper improves on previous treatments of the scattering processes and the opacity for the Lyalpha transfer. Confirming the previous results of the LR halo, we investigate the effect of the aspherical expansion of the IGM. The asphericity is hypothesized to follow the initial stage of the gravitational deceleration to form the large-scale filamentary structure of the universe. According to our results, the effect of the asphericity lets the peak wavelength of the line profile shift to longer wavelengths and the FWHM of the profile become wider than those of the spherically expanding model. Detecting these features is meaningful if we are interested in the initial evolution of the large-scale structure, since they reflect the dynamical properties of the IGM at that time. Furthermore, given the recent discovery of the high-redshift cosmological reionization, we briefly comment on the effects of the redshift and the cosmological parameters on the line profile. [References: 17]
机译：通过解决辐射转移问题，研究了Loeb-Rybicki（LR）光环中的Lyalpha线发射，Loeb-Rybicki（LR）光环是围绕第一星团和离子化星际介质扩展的H I星系间介质（IGM）。尽管对于Lyalpha光子而言，初始散射光学深度类似于10（5），但是当由于H IIGM的膨胀而导致的累积频移变得很大时，大多数Lyalpha光子会逸出。当前的论文改进了散射过程和Lyalpha转移的不透明度的先前处理方法。确认LR晕圈的先前结果，我们研究了IGM的非球面扩张效应。假设非球面度遵循重力减速的初始阶段，以形成宇宙的大规模丝状结构。根据我们的结果，非球面性的影响使线轮廓的峰值波长移至更长的波长，并且轮廓的FWHM比球形扩展模型的宽。如果我们对大型结构的最初演变感兴趣，检测这些特征将是有意义的，因为它们反映了当时IGM的动力学特性。此外，鉴于最近发现的高红移宇宙学电离，我们简要评论了红移和宇宙学参数对线剖面的影响。 [参考：17]

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