1509.02935
Ultraviolet Luminosity Density of the Universe During the Epoch of Reionization
Mitchell-Wynne, Coorary, ... Grogin, Koekemoer, et al
The spatial fluctuations of the extragalactic background light trace the total emission from all stars and galaxies in the Universe. A multi-wavelength study can be used to measure the integrated emission from first galaxies during reionization when the Universe was about 500 M yr old. Report arcminute-scale spatial fluctuations in one of the deepest sky surveys with the HST in five wavebands between 0.6 and 1.6 um. Model-fit the angular power spectra of intensity fluctuation measurements to find the UV luminosity density of galaxies at z>8 to be log rho_UV=27.4+0.2-1.2 erg/s/Hz/Mpc^3 (1sigma). This level of integrated light emission allows for a significant surface density of fainter primeval galaxies that are below the point source detection level in current surveys.
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