The Clustering of Undetected High-redshift Black Holes and Their Signatures in Cosmic Backgrounds

Understand

There exist hitherto unexplained fluctuations in the Cosmic Infrared Background (CIB) on arcminute scales and larger.

• These have been shown to cross-correlate with the Cosmic X-ray Background (CXB), leading several authors to attribute the excess to a high-redshift growing black hole population.
• In order to investigate potential sources that could explain this excess, in this paper, we develop a new framework to compute the power spectrum of undetected sources that do not have constant flux as a function of halo mass.
• In this formulation, we combine a semi-analytic model for black hole growth and their simulated spectra from hydrodynamical simulations.