在21厘米森林中寻找最早的星系
Searching for the earliest galaxies in the 21 cm forest
摘要：
我们使用Xu et al.（2010）开发的模型来计算由恒星形成的矮星系（DG）和无星迷你晕（MH）留下的21 cm线吸收特征。该方法基于等效宽度（W_v）分布和通量关联函数的统计比较，使我们能够导出一个简单的在很高（z >= 8）红移的候选DG的选择准则。我们发现，在到达目标射电源（GRB或类星体）的视线上，约有18%的DG可以通过条件W_v < 0来识别;这些天体对应于DG分布在高红移处的高质量尾部，并且嵌入在大的HII区域中。标准W_v> 0.37 kHz反而选择约11%的MH。选定的候选DG可以在以后重新观察近红外的JWST的效率高，从而提供了一个最有可能的再电离源的直接探测。
英文摘要：
We use a model developed by Xu et al. (2010) to compute the 21 cm line absorption signatures imprinted by star-forming dwarf galaxies (DGs) and starless minihalos (MHs). The method, based on a statistical comparison of the equivalent width (W_ν) distribution and flux correlation function, allows us to derive a simple selection criteria for candidate DGs at very high (z >= 8) redshift. We find that ~ 18% of the total number of DGs along a line of sight to a target radio source (GRB or quasar) can be identified by the condition W_ν< 0; these objects correspond to the high-mass tail of the DG distribution at high redshift, and are embedded in large HII regions. The criterion W_ν> 0.37 kHz instead selects ~ 11% of MHs. Selected candidate DGs could later be re-observed in the near-IR by the JWST with high efficiency, thus providing a direct probe of the most likely reionization sources.
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