论文标题
量化与21cm功率谱的密度离子化相关性
Quantifying Density-Ionization Correlations with the 21cm Power Spectrum
论文作者
论文摘要
当系统离子化的中性氢被系统离子化时，电离时代（EOR）---当前是我们宇宙历史上的一个时期，目前知之甚少。但是，大多数模型的关键预测是EOR期间的密度和电离场之间的相关性。这对21厘米的功率谱有后果。在这里，我们提出了密度离子相关性的参数化，并研究了21cm功率谱对此参数化的依赖性。我们使用这种形式主义来预测当前和将来的观察限制这些相关性的能力。我们发现，使用$ k $ bins $ 7.5 <z <8.5 $的无量纲功率谱的上限使用$ k $ bins $ 0.1 \，\ textrm {mpc}^{ - 1} <k <0.75 \，\ textrm {mpc}^{mpc}^{ - 1} $ $ \ sim \！\！20 \，\ textrm {mk}^2 $围绕我们的基准模型排除在$ 99 \％$可信度下不相关的回报。除了上限之外，我们发现，在其全部敏感性下，电离阵列（HERA）的氢时代将能够在密度离子相关性的符号和幅度上放置强大的约束。
The Epoch of Reionization (EoR)---when neutral hydrogen in the intergalactic medium was systematically ionized---is a period in our Universe's history that is currently poorly understood. However, a key prediction of most models is a correlation between the density and ionization field during the EoR. This has consequences for the 21cm power spectrum. Here, we propose a parametrization for the density-ionization correlation and study the dependence of the 21cm power spectrum on this parameterization. We use this formalism to forecast the ability of current and future observations to constrain these correlations. We find that upper limits on the dimensionless power spectrum at redshifts $7.5 < z < 8.5$ using $k$ bins between $0.1\,\textrm{Mpc}^{-1} < k < 0.75\,\textrm{Mpc}^{-1}$ with error bars at the level of $\sim\!\!20\,\textrm{mK}^2$ about our fiducial model would rule out uncorrelated reionization at $99\%$ credibility. Beyond upper limits, we find that at its full sensitivity, the Hydrogen Epoch of Reionization Array (HERA) will be able to place strong constraints on the sign and magnitude of density-ionization correlations.
