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In this paper we use radiative transfer + N-body simulations to explore thefeasibility of measurements of cross-correlations between the 21cm fieldobserved by the Square Kilometer Array (SKA) and high-z Lyman Alpha Emitters(LAEs) detected in galaxy surveys with the Subaru Hyper Supreme Cam (HSC),Subaru Prime Focus Spectrograph (PFS) and Wide Field Infrared Survey Telescope(WFIRST). 21cm-LAE cross-correlations are in fact a powerful probe of the epochof reionization as they are expected to provide precious information on theprogress of reionization and the typical scale of ionized regions at differentredshifts. The next generation observations with SKA will have a noise levelmuch lower than those with its precursor radio facilities, introducing asignificant improvement in the measurement of the cross-correlations. We findthat an SKA-HSC/PFS observation will allow to investigate scales below ~10Mpc/h and ~60 Mpc/h at z=7.3 and 6.6, respectively. WFIRST will allow to accessalso higher redshifts, as it is expected to observe spectroscopically ~900 LAEsper square degree and unit redshift in the range 7.5<z<8.5. Because of thereduction of the shot noise compared to HSC and PFS, observations with WFIRSTwill result in more precise cross-correlations and increased observable scales.

Predictions for the 21cm-galaxy cross-power spectrum observable with SKA and future galaxy surveys