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The HI intensity mapping power spectrum: insights from recent measurements
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abstract
The first direct measurements of the HI intensity mapping power spectrum were recently made using the MeerKAT telescope. These measurements are on nonlinear scales, at redshifts 0.32 and 0.44. We develop a formalism for modelling small-scale power in redshift space, within the context of the mass-weighted HI halo model framework. This model is consistent with the latest findings from surveys on the HI-halo mass relation. In order to model nonlinear scales, we include the 1-halo, shot-noise and finger-of-god effects. Then we apply the model to the MeerKAT auto-correlation data, finding that the model provides a good fit to the data at redshift 0.32, but the data may indicate some evidence for an adjustment at $z \sim 0.44$. Such an adjustment can be achieved by an increase in the HI abundance or halo model bias.
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Cited by 1 Pith paper
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Probing the HI distribution at small scales using 21-cm Intensity Mapping at large scales
A proof-of-concept showing that large-scale 21-cm power spectrum and bispectrum, plus an independent measurement of the cosmic HI density, can constrain the parameters of the HI mass-halo mass relation at z=1.
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