用改进后的巨米波Radio Telescope（uGMRT）测量宇宙黎明21厘米功率谱的前景
On the Prospects of Measuring the Cosmic Dawn 21-cm Power Spectrum using the Upgraded Giant Meterwave Radio Telescope (uGMRT)
摘要：
EDGES合作组最近的一项观测显示，在全球21厘米光谱中，红移约为$z = 17$的吸收信号很强。这种吸收比现有模型预测的最大值更强，表明宇宙黎明时\HI 21厘米亮度温度的空间波动可能比先前预期的大一个数量级。本文研究了利用uGMRT探测宇宙黎明\HI 21厘米功率谱的前景。我们发现，$10σ$检测增强的\HI 21厘米信号功率谱是可能的$70, 140$和$400$小时的观察分别为一个乐观的，温和的和悲观的情况下，使用带-1的uGMRT。这可能是早期宇宙中重子和暗物质粒子之间相互作用的有用探测器。我们还提出了一个uGMRT预测与未来SKA-Low的比较。
英文摘要：
A recent observation by the EDGES collaboration shows a strong absorption signal in the global 21-cm spectrum from around a redshift of $z = 17$. This absorption is stronger than the maximum prediction by existing models and indicates that the spatial fluctuations of the \HI 21-cm brightness temperature at Cosmic Dawn could be an order of magnitude larger than previously expected. In this paper, we investigate the prospects of detecting the \HI 21-cm power spectrum from Cosmic Dawn using uGMRT. We find that a $10σ$ detection of the enhanced \HI 21-cm signal power spectrum is possible within $70, 140$ and $400$ Hours of observation for an optimistic, moderate and pessimistic scenario respectively, using the Band-1 of uGMRT. This could be an useful probe of the interaction between the baryon and dark matter particles in the early Universe. We also present a comparison of the uGMRT predictions with those for the future SKA-Low.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
