Forecasting [C II] line-intensity mapping measurements between the end of reionization and the epoch of galaxy assembly

Abstract

We combine recent simulation work on the SFR--[C II] correlation at high redshift with empirical modeling of the galaxy--halo connection (via UniverseMachine) to forecast [C II] auto power spectra from $z\sim 4$ to $z\sim 8$. We compare these to sensitivities realistically expected from various instruments expected to come on-line in the next decade. If the predictions of our model are correct, [C II] should be detectable up to $z\sim 6$ in this generation of surveys, but detecting [C II] past the end of reionization will require a generational leap in line-intensity survey capabilities.

arXiv comment11 pages + appendix (16 total), 3 figures, 5 tables; accepted for publication in ApJ

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