论文标题
使用强烈的重力镜头来探测电离后\ HI功率谱
Using strong gravitational lensing to probe the post reionization \HI power spectrum
论文作者
论文摘要
使用红移的21厘米超精美过渡光谱线对中性氢（\ hi）进行探测统计分布，这是了解宇宙中物质密度的形成和演化的关键。 \ HI分布的两点统计量可以通过使用可见性相关性测量红移21-CM信号的功率谱来估算。在这方面，一个主要的挑战是，与观测频率中银河同步加速器发射和外乳外点源的前景贡献相比，预期信号较弱。在这项工作中，我们研究了通过使用星系簇的强力透镜检测红移21厘米信号的功率谱的可能性。该方法的优点是它仅增强\ hi信号，而不是扩散的银河前景。基于四个简单的群集电势模型，我们表明，具有多个暗物质光环的相对较低的红移的强镜显着增强了电离后时代的21 cm信号。我们讨论该方法的优点和缺点以及进一步研究所需的未来研究。
Probing statistical distribution of the neutral hydrogen (\HI) using the redshifted 21-cm hyperfine-transition spectral line holds the key to understand the formation and evolution of the matter density in the universe. The two-point statistics of the \HI distribution can be estimated by measuring the power spectrum of the redshifted 21-cm signal using visibility correlation. A major challenge in this regard is that the expected signal is weak compared to the foreground contribution from the Galactic synchrotron emission and extragalactic point sources in the observing frequencies. In this work, we investigate the possibility of detecting the power spectrum of the redshifted 21-cm signal by using strong gravitational lensing of the galaxy clusters. This method has the advantage that it only enhances the \HI signal and not the diffuse galactic foreground. Based on four simple models of the cluster potentials we show that the strong lenses at relatively lower redshifts with more than one dark matter halo significantly enhances the 21-cm signal from the post reionization era. We discuss the merits and demerits of the method and the future studies required for further investigations.
