Extracting HI Astrophysics from Interferometric Intensity Mapping
Zhaoting Chen, Laura Wolz, Marta Spinelli, Steven G. Murray

TL;DR
This paper develops a halo model for neutral hydrogen to analyze interferometric intensity mapping, forecasting precise measurements of HI properties with upcoming SKA surveys and proposing new methods to constrain the HI mass function.
Contribution
It introduces a calibrated halo model for HI, incorporates a new shot noise description, and demonstrates how intensity mapping can constrain HI astrophysics and the HI mass function.
Findings
Forecasts 6% precision on $\
Forecasts 1% precision on large-scale HI bias at z~0.1.
Proposes a new method to constrain the HI mass function using shot noise.
Abstract
We present a new halo model of neutral hydrogen (HI) calibrated to galaxy formation simulations at redshifts and 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 and the HI bias . For , we forecast that an accurate measurement of up to 6% level precision and the large-scale HI bias 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…
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