The first galaxies and miniquasars will remain largely inaccessible to future telescopes, but may be detectable via their contribution to the Cosmic near-Infrared Background (CIB) anisotropies. A significant extragalactic clustering signal from an unresolved population is now well established by CIB fluctuation measurements. I will review the current status of the field, focusing on a recent discovery of a cross-correlation signal between the CIB fluctuations and the unresolved Cosmic X-ray Background. I present a population study of all galaxies and AGN and predict their contributions to the CIB and CXB including the mutual cross-correlation signal. I discuss the signal’s potential for probing the early Universe in several upcoming CIB measurements, including LIBRAE, an ESA selected science program dedicated to CIB fluctuation exploration with the Euclid telescope.

Host:  Mike McDonald