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We investigate the feasibility of measuring the effects of peculiarvelocities in large-scale structure using the dipole of the redshift-spacecross-correlation function. We combine number counts of galaxies withbrightness-temperature fluctuations from 21cm intensity mapping, demonstratingthat the dipole may be measured at modest significance ($\lesssim 2\sigma$) bycombining the upcoming radio survey CHIME with the future redshift surveys ofDESI and Euclid. More significant measurements ($\lesssim~10\sigma$) will bepossible by combining intensity maps from the SKA with these of DESI or Euclid,and an even higher significance measurement ($\lesssim 100\sigma$) may be madeby combining observables completely internally to the SKA. We account foreffects such as contamination by wide-angle terms, interferometer noise andbeams in the intensity maps, non-linear enhancements to the power spectrum,stacking multiple populations, sensitivity to the magnification slope, and thepossibility that number counts and intensity maps probe the same tracers. Wealso derive a new expression for the covariance matrix of multi-tracerredshift-space correlation function estimators with arbitrary orientationweights, which may be useful for upcoming surveys aiming at measuringredshift-space clustering with multiple tracers.

Measuring cosmic velocities with 21cm intensity mapping and galaxy redshift survey cross-correlation dipoles