通过21厘米的特征探测早期的Galerkin
Detecting Early Galaxies Through Their 21-cm Signature
摘要：
未来几年对遥远天体发射的新观测将有助于揭开第一个星系时代的宇宙历史篇章。这些观测将使用21厘米波长的中性氢发射或吸收作为氢丰度的探测器。我们预测的签名上的21厘米信号的早期几代星系。我们计算的21厘米功率谱，包括两个物理效应，被忽略在以前的计算。第一个是来自第一个星系的紫外光子的重新分布，这是由于它们被中性氢散射，这导致了21厘米信号的增强。第二个是在每个源附近存在电离的氢气泡，这在可观察的尺度上产生截止。我们表明，在21厘米功率谱中产生的清晰签名可用于检测和研究大爆炸后仅2亿年形成的星系群。
英文摘要：
New observations over the next few years of the emission of distant objects will help unfold the chapter in cosmic history around the era of the first galaxies. These observations will use the neutral hydrogen emission or absorption at a wavelength of 21-cm as a detector of the hydrogen abundance. We predict the signature on the 21-cm signal of the early generations of galaxies. We calculate the 21-cm power spectrum including two physical effects that were neglected in previous calculations. The first is the redistribution of the UV photons from the first galaxies due to their scattering off of the neutral hydrogen, which results in an enhancement of the 21-cm signal. The second is the presence of an ionized hydrogen bubble near each source, which produces a cutoff at observable scales. We show that the resulting clear signature in the 21-cm power spectrum can be used to detect and study the population of galaxies that formed just 200 million years after the Big Bang.
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