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We investigate the cross-correlation between the spatial distribution ofLyman Break Galaxies (LBGs) and the 21cm intensity mapping signal at$z\sim[3-5]$. At these redshifts, galactic feedback is supposed to onlymarginally affect the matter power spectrum, and the neutral hydrogendistribution is independently constrained by quasar spectra. Using a highresolution N-body simulation, populated with neutral hydrogen a posteriori, weforecast for the expected LBG-21cm cross-spectrum and its error for a 21cmfield observed by the Square Kilometre Array (SKA1-LOW and SKA1-MID), combinedwith a spectroscopic LBG survey with the same volume. The cross power can bedetected with a signal-to-noise ratio (SNR) up to ~10 times higher (and down to~4 times smaller scales) than the 21cm auto-spectrum for this set-up, with theSNR depending only very weakly on redshift and the LBG population. We also showthat while both the 21cm auto- and LBG-21cm cross-spectra can be reliablyrecovered after the cleaning of smooth-spectrum foreground contamination, onlythe cross-power is robust to problematic non-smooth foregrounds like polarizedsynchrotron emission.

Cross-correlating 21cm intensity maps with Lyman Break Galaxies in the post-reionization era