Speaker
Description
The extragalactic background light (EBL) encodes the cumulative radiation from extragalactic sources across ultraviolet to infrared wavelengths, serving as a key probe of galaxy formation and cosmic evolution. This study enhances previous EBL reconstructions by incorporating the Spectral TeV Extragalactic Catalog (STeVECat), expanding the sample from our previous study to include a larger set of very-high-energy (VHE) gamma-ray sources, allowing a detailed derivation of the infrared region of the EBL. After selection cuts, a refined dataset of several hundred blazars up to z ~ 1, nearly five times larger than in our previous study, leads to a twofold enhancement in redshift binning resolution. This improvement, along with updated EBL results based on Fermi-LAT data to be presented in a separate contribution, allows for the reconstruction of the EBL evolution up to z ~ 4, providing a more detailed picture of its build-up over cosmic time with better resolution and reduced model dependence. Our results indicate that the EBL is well accounted for by resolved galaxy populations, leaving little room for additional diffuse contributions.
