# Constraining the CO intensity mapping power spectrum at intermediate redshifts

## TL;DR

This paper develops a data-driven model to constrain the CO intensity mapping power spectrum at intermediate redshifts, integrating various observational constraints to predict galaxy clustering and luminosity evolution.

## Contribution

It introduces a halo model based on compiled CO luminosity functions, providing predictions and fitting formulas for the CO power spectrum at redshifts 0-3.

## Key findings

- Predictions consistent with existing intermediate redshift surveys
- Provides fitting formulas for CO luminosity-halo mass relation
- Estimates uncertainties for future intensity mapping experiments

## Abstract

We compile available constraints on the carbon monoxide (CO) 1-0 luminosity functions and abundances at redshifts 0-3. This is used to develop a data driven halo model for the evolution of the CO galaxy abundances and clustering across intermediate redshifts. It is found that the recent constraints from the CO Power Spectrum Survey ($z \sim 3$; Keating et al. 2016), when combined with existing observations of local galaxies ($z \sim 0$; Keres et al. 2003), lead to predictions which are consistent with the results of smaller surveys at intermediate redshifts ($z \sim 1-2$). We provide convenient fitting forms for the evolution of the CO luminosity - halo mass relation, and estimates of the mean and uncertainties in the CO power spectrum in the context of future intensity mapping experiments.