The high redshift star-formation history from carbon-monoxide intensity
  maps
  We demonstrate how cosmic star-formation history can be measured with
one-point statistics of carbon-monoxide intensity maps. Using a P(D) analysis,
the luminosity function of CO-emitting sources can be inferred from the
measured one-point intensity PDF. The star-formation rate density (SFRD) can
then be obtained, at several redshifts, from the CO luminosity density. We
study the effects of instrumental noise, line foregrounds, and target redshift,
and obtain constraints on the CO luminosity density of order 10%. We show that
the SFRD uncertainty is dominated by that of the model connecting CO luminosity
and star formation. For pessimistic estimates of this model uncertainty, we
obtain an error of order 50% on SFRD for surveys targeting redshifts between 2
and 7 with reasonable noise and foregrounds included. However, comparisons
between intensity maps and galaxies could substantially reduce this model
uncertainty. In this case our constraints on SFRD at these redshifts improve to
roughly 5-10%, which is highly competitive with current measurements.
