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We quantify the prospects for using emission lines from rotationaltransitions of the CO molecule to perform an `intensity mapping' observation athigh redshift during the Epoch of Reionization (EoR). The aim of CO intensitymapping is to observe the combined CO emission from many unresolved galaxies,to measure the spatial fluctuations in this emission, and use this as a tracerof large scale structure at very early times in the history of our Universe.This measurement would help determine the properties of molecular clouds -- thesites of star formation -- in the very galaxies that reionize the Universe. Wefurther consider the possibility of cross-correlating CO intensity maps withfuture observations of the redshifted 21 cm line. The cross spectrum is lesssensitive to foreground contamination than the auto power spectra, and cantherefore help confirm the high redshift origin of each signal. Furthermore,the cross spectrum measurement would help extract key information about theEoR, especially regarding the size distribution of ionized regions. We discussuncertainties in predicting the CO signal at high redshift, and discussstrategies for improving these predictions. Under favorable assumptions, andfeasible specifications for a CO survey mapping the CO(2-1) and CO(1-0) lines,the power spectrum of CO emission fluctuations and its cross spectrum withfuture 21 cm measurements from the MWA are detectable at high significance.

Intensity Mapping with Carbon Monoxide Emission Lines and the Redshifted 21 cm Line