用LOFAR和SKA模拟高z γ暴谱中可探测的21 cm森林
Simulating the 21cm forest detectable with LOFAR and SKA in the spectra of high-z GRBs
摘要：
本文研究了在高红移长伽马射线暴（GRB）余辉光谱中探测21 cm吸收特征的可行性。这是采用模拟宇宙再电离，连同仪器特性的低频阵列射线（LOFAR）。我们发现，如果GRB起源于PopIII星，LOFAR在z>7时可以检测到吸收特征（S/N大于几个），而如果噪声减少一个数量级，即类似于平方公里阵列（SKA 1-low）的第一阶段，则检测会更容易。另一方面，更多的标准伽玛暴太暗，即使用SKA 1-low的十倍灵敏度也无法探测到，只有在最乐观的情况下，在z>9时才能达到大于几个的S/N。
英文摘要：
We investigate the feasibility of detecting 21cm absorption features in the afterglow spectra of high redshift long Gamma Ray Bursts (GRBs). This is done employing simulations of cosmic reionization, together with the instrumental characteristics of the LOw Frequency ARray (LOFAR). We find that absorption features could be marginally (with a S/N larger than a few) detected by LOFAR at z>7 if the GRB originated from PopIII stars, while the detection would be easier if the noise were reduced by one order of magnitude, i.e. similar to what is expected for the first phase of the Square Kilometer Array (SKA1-low). On the other hand, more standard GRBs are too dim to be detected even with ten times the sensitivity of SKA1-low, and only in the most optimistic case can a S/N larger than a few be reached at z>9.
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