The Intergalactic mid IR - Far IR Luminosity Density and the Gamma-Ray Opacity of the Universe

We present the results of extending our previous empirically determined EBL through the mid-IR and into the far-IR determined primarily from galaxy luminosity functions. The thermal reemission by dust grains of UV radiation from high mass stars leads to a strong redshift evolution of galaxy LFs at these wavelengths. Indeed the Spitzer Wide-area Infrared Extragalactic survey, AKARI, and the recent deep Herschel PACS PEP survey have produced accurate determinations of MIR and FIR LFs and their redshift evolution. Thus we can now construct the observationally tolerated luminosity densities and their redshift evolution with a minimal amount of assumptions. Our results are then used to calculate the z = 0 EBL and compare this with the observational constraints. We further use them to calculate the opacity of the Universe to gamma-rays with energies from ~300 GeV in the upper Fermi range to the 10s of TeV range capable of being observed by the Cherenkov Telescope Array.