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Line-intensity mapping (LIM or IM) is an emerging field of observationalwork, with strong potential to fit into a larger effort to probe large-scalestructure and small-scale astrophysical phenomena using multiple complementarytracers. Taking full advantage of such complementarity means, in part,undertaking line-intensity surveys with galaxy surveys in mind. We consider thepotential for detection of a cross-correlation signal between COMAP and blindsurveys based on photometric redshifts (as in COSMOS) or based on spectroscopicdata (as with the HETDEX survey of Lyman-$\alpha$ emitters). We find thatobtaining $\sigma_z/(1+z)\lesssim0.003$ accuracy in redshifts and$\gtrsim10^{-4}$ sources per Mpc$^3$ with spectroscopic redshift determinationshould enable a CO-galaxy cross spectrum detection significance at least twicethat of the CO auto spectrum. Either a future targeted spectroscopic survey ora blind survey like HETDEX may be able to meet both of these requirements.

Cross-correlating Carbon Monoxide Line-intensity Maps with Spectroscopic and Photometric Galaxy Surveys