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We present $\gamma$-ray optical-depth calculations from a recently publishedextragalactic background light (EBL) model built from multiwavelength galaxydata from the Hubble Space Telescope Cosmic Assembly Near-Infrared DeepExtragalactic Legacy Survey (HST/CANDELS). CANDELS gathers one of the deepestand most complete observations of stellar and dust emissions in galaxies. Thismodel resulted in a robust derivation of the evolving EBL spectral energydistribution up to $z\sim 6$, including the far-infrared peak. Therefore, theoptical depths derived from this model will be useful for determining theattenuation of $\gamma$-ray photons coming from high-redshift sources, such asthose detected by the Large Area Telescope on board the Fermi Gamma-ray SpaceTelescope, and for multi-TeV photons that will be detected from nearby sourcesby the future Cherenkov Telescope Array. From these newly calculated opticaldepths, we derive the cosmic $\gamma$-ray horizon and also measure theexpansion rate and matter content of the Universe including an assessment ofthe impact of the EBL uncertainties. We find $H_{0}=61.9$ $^{+2.9}_{-2.4}$ kms$^{-1}$ Mpc$^{-1}$ when fixing $\Omega_{m}=0.32$, and $H_{0}=65.6$$^{+5.6}_{-5.0}$ km s$^{-1}$ Mpc$^{-1}$ and $\Omega_{m}=0.19\pm 0.07$, whenexploring these two parameters simultaneously.

A new derivation of the Hubble constant from $\gamma$-ray attenuation using improved optical depths for the Fermi and CTA era