The parameter-free Finger-Of-God model and its application to 21cm intensity mapping

TL;DR

This paper introduces a parameter-free Finger-of-God model for 21cm intensity mapping, effectively explaining the velocity dispersion effects and accurately fitting the HI power spectrum, aiding future cosmological experiments.

Contribution

The paper develops a novel, parameter-free FoG model that improves the accuracy of HI power spectrum predictions in 21cm intensity mapping simulations.

Findings

The FoG effect explains discrepancies between mock maps and simulations.

The model accurately fits monopole and quadrupole moments.

Method is useful for upcoming 21cm experiments.

Abstract

Using the galaxy catalog built from ELUCID N-body simulation and the semi-analytical galaxy formation model, we have built a mock HI intensity mapping map. We have implemented the Finger-of-God (FoG) effect in the map by considering the galaxy HI gas velocity dispersion. By comparing the HI power spectrum in the redshift space with the measurement from IllustrisTNG simulation, we have found that such FoG effect can explain the discrepancy between current mock map built from N-body simulation and Illustris TNG simulation. Then we built a parameter-free FoG model and a shot-noise model to calculate the HI power spectrum. We found that our model can accurately fit both the monopole and quadrupole moments of the HI matter power spectrum. Our method of building the mock HI intensity map and the parameter-free FoG model will be widely useful for the up-coming 21cm intensity mapping experiments, such as CHIME, Tianlai, BINGO, FAST and SKA. It is also crucial for us to study the non-linear effects in 21cm intensity mapping.