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Intensity mapping of 21-cm line by several radio telescope experiments willprobe the large-scale structure of the Universe in the post-reionization epoch.It requires a theoretical framework of neutral hydrogen (HI) clustering, suchas modelling of HI power spectrum for Baryon Acoustic Oscillations (BAO)analysis. We propose a new method for reconstructing the HI map from darkmatter distribution using N-body simulations. Several studies attempt tocompute the HI power spectrum with N-body simulations by pasting HI gas at thedark matter halo centre, assuming the relation between the halo and HI masses.On the other hand, the method proposed in this paper reproduces the HI powerspectrum from simulated dark matter distribution truncated at specific scalesfrom the halo centre. With this method, the slope of HI power spectrum isreproduced well at the BAO scales, $k<1 h/{\rm Mpc}$. Furthermore, we find thefluctuation of spin temperature, which is often ignored at thepost-reionization epoch, alters the power spectrum of brightness temperature byat most 8% in the power spectrum. Finally, we discuss how our method works bycomparing the density profiles of HI and dark matter around the dark matterhalos.

Reconstructing HI power spectrum with minimal parameters using the dark matter distribution beyond halos