Intensity mapping of intergalactic Lyman- haloes before reionization

We use the inferred evolution of Lyman- luminosities of galaxies in the redshift range of z 9-16 from the James \ Webb \ Space \ Telescope (JWST) data to predict the power spectrum of Loeb-Rybicki haloes formed by scattered Lyman- radiation in the diffuse intergalactic hydrogen before reionization. We find excellent prospects for a statistical detection of the intensity mapping signal with current and future experiments such as the JWST, SPHEREx and CDIM. We also describe the detectability of the signal in cross-correlation with the 21-cm emission from atomic hydrogen in the intergalactic medium at these redshifts. We find that the cross-correlation signal should be detectable at a significance of a few tens of standard deviations out to z 16 using the above experiments in combination with the Square Kilometre Array (SKA) -LOW and its pathfinder, the Murchison Widefield Array (MWA).