Synergy of CO/[CII]/Ly$\alpha$ Line Intensity Mapping with the SKA

TL;DR

This paper explores how cross-correlating SKA1-LOW 21-cm surveys with other line intensity mappings like CO, [CII], and Ly-$eta$ can enhance understanding of the Epoch of Reionization by validating models and improving measurements.

Contribution

It proposes a framework for joint modeling and forecasting of auto- and cross-power spectra of multiple line tracers during reionization.

Findings

Cross-correlation enhances detection confidence of reionization signals.

Multiple line tracers help validate star-formation rate models.

Forecasts demonstrate improved constraints on EoR parameters.

Abstract

We present the science enabled by cross-correlations of the SKA1-LOW 21-cm EoR surveys with other line mapping programs. In particular, we identify and investigate potential synergies with planned programs, such as the line intensity mapping of redshifted CO rotational lines, [CII] and Ly-$\alpha$ emissions during reionization. We briefly describe how these tracers of the star-formation rate at $z \sim 8$ can be modeled jointly before forecasting their auto- and cross-power spectra measurements with the nominal 21cm EoR survey. The use of multiple line tracers would be invaluable to validate and enrich our understanding of the EoR.