Fast simulations for intensity mapping experiments

TL;DR

This paper introduces a computationally efficient simulation code for 21 cm intensity mapping experiments, capable of generating realistic cosmological signals and foregrounds for forecasting and analysis.

Contribution

The new code reduces computational costs while accurately reproducing clustering patterns, redshift-space distortions, and foregrounds, including polarized synchrotron emission.

Findings

Accurately reproduces angular and radial clustering patterns

Simulates various foregrounds including polarized synchrotron emission

Reduces computational time for intensity mapping simulations

Abstract

We present a code to generate mock observations of 21 cm intensity mapping experiments. The emphasis of the code is on reducing the computational cost of running a full-blown simulation, trading computational time for accuracy. The code can be used to generate independent realizations of the cosmological signal and foregrounds, which are necessary, for instance, in order to obtain realistic forecasts for future intensity mapping experiments. The code is able to reproduce the correct angular and radial clustering pattern for the cosmological signal, including redshift-space distortions, lightcone evolution and bias. Furthermore, it is possible to simulate a variety of foregrounds, including the potentially problematic polarized synchrotron emission.