The effect of finite halo size on the clustering of neutral hydrogen.

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dc.contributor.authorUmeh, O
dc.contributor.authorMaartens, R
dc.contributor.authorCamera, S
dc.date.accessioned2021-09-13T11:34:06Z
dc.date.available2021-09-13T11:34:06Z
dc.date.issued2021
dc.description.abstractPost-reionisation 21cm intensity mapping experiments target the spectral line of neutral hydrogen (HI) resident in dark matter haloes. According to the halo model, these discrete haloes trace the continuous dark matter density field down to a certain scale, which is dependent on the halo physical size. The halo physical size defines an exclusion region which leaves imprints on the statistical properties of HI. We show how the effect of exclusion due to the finite halo size impacts the HI power spectrum, with the physical boundary of the host halo given by the splashback radius. Most importantly, we show that the white noise-like feature that appears in the zero-momentum limit of the power spectrum is exactly cancelled when the finite halo size is taken into consideration. This cancellation in fact applies to all tracers of dark matter density field, including galaxies. Furthermore, we show that the exclusion due to finite halo size leads to a sub-Poissonian noise signature on large scales, consistent with the results from N-body simulations.en_US
dc.identifier.citationUmeh, O., Maartens, R., Padmanabhan, H., & Camera, S. (2021). The effect of finite halo size on the clustering of neutral hydrogen. Journal of Cosmology and Astroparticle Physics, 2021(6). https://doi.org/10.1088/1475-7516/2021/06/027en_US
dc.identifier.issn14757516
dc.identifier.other10.1088/1475-7516/2021/06/027
dc.identifier.urihttp://hdl.handle.net/10566/6669
dc.language.isoenen
dc.publisherIOPen_US
dc.subjectpower spectrumen_US
dc.subjectgalaxy clusteringen_US
dc.titleThe effect of finite halo size on the clustering of neutral hydrogen.en_US
dc.typeArticleen_US

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