从干涉强度图中提取HI天体物理
Extracting HI Astrophysics from Interferometric Intensity Mapping
摘要：
本文提出了一个新的中性氢晕模型，用于研究干涉型中性氢强度映射对中性氢天体物理的约束作用。该模型在红移为$z\sim0.1$和$z\sim1.0$的星系形成模拟中进行了标定。我们证明了小尺度HI功率谱上的约束可以打破HI密度$Ω_{\rm HI}$和HI偏置$b_{\rm HI}$之间的简并。对于$z\sim0.1$，我们预测使用来自MeerKAT和澳大利亚SKA Pathfinder（ASKAP）的SKA Pathfinder数据可以实现高达6%水平精度的$Ω_{\rm HI}$精确测量和高达1%水平精度的大尺度HI偏差$b_{\rm HI}^0$。我们还提出了一个新的描述的HI散粒噪声的晕模型框架中，其中考虑了分散的星系的HI质量之间的关系和他们的主机晕质量。此外，鉴于HI星系的数量密度高于一定的HI质量阈值，未来的调查也将能够约束HI质量函数只使用HI散粒噪声。这将导致使用标准Schechter函数的10%水平的约束。该技术将潜在地提供独立于现有方法的测量HI质量函数的新方法。我们预测，SKA将能够进一步改善低红移的限制的一个因素，以及开创性的测量HI天体物理在更高的红移。
英文摘要：
We present a new halo model of neutral hydrogen (HI) calibrated to galaxy formation simulations at redshifts $z\sim0.1$ and $z\sim1.0$ that we employ to investigate the constraining power of interferometric HI intensity mapping on HI astrophysics. We demonstrate that constraints on the small-scale HI power spectrum can break the degeneracy between the HI density $Ω_{\rm HI}$ and the HI bias $b_{\rm HI}$. For $z\sim0.1$, we forecast that an accurate measurement of $Ω_{\rm HI}$ up to 6% level precision and the large-scale HI bias $b_{\rm HI}^0$ up to 1% level precision can be achieved using Square Kilometre Array (SKA) pathfinder data from MeerKAT and Australian SKA Pathfinder (ASKAP). We also propose a new description of the HI shot noise in the halo model framework in which a scatter of the relation between the HI mass of galaxies and their host halo mass is taken into account. Furthermore, given the number density of HI galaxies above a certain HI mass threshold, future surveys will also be able to constrain the HI mass function using only the HI shot noise. This will lead to constraints at the 10% level using the standard Schechter function. This technique will potentially provide a new way of measuring the HI Mass Function, independent from existing methods. We predict that the SKA will be able to further improve the low-redshift constraints by a factor of 3, as well as pioneering measurements of HI astrophysics at higher redshifts.
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