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AGNs are believed to be the source of very energetic cosmic rays which, inturn, produce gamma rays throughout the interactions with matter. Therefore,the study of their very-high-energy (VHE) gamma-ray spectra is fundamental tounderstand the cosmic-ray acceleration mechanisms in these objects. Blazars arethe most common type of AGNs populating gamma-ray catalogs, among these sourcesBL-Lacs present featureless or very weak emission/absorption lines spectra.Given that the extragalactic VHE gamma-ray catalog is poorly populated (about70 blazars), having a redshift estimation of every single source is importantfor the study of cosmic rays origin. In this work we use EBL absorption as atool to estimate KUV 00311-1938 redshift by comparing HE gamma-ray observationswith modeled EBL absorbed flux points. KUV 00311-1938 is a very interestingBL-Lac; a priori it can be one of the most distant blazars since it has anestimated redshift in the range 0.5 to 1.54. Assuming that there is no spectralcutoff, we consider the intrinsic VHE spectrum to be the extrapolation of theFermi-LAT spectrum and model the intergalactic absorption by using the maincurrent EBL models. Comparing these results with the VHE measured point byH.E.S.S., we give an estimate for the redshift of the blazar within observationerrors.

Redshift of the Blazar KUV 00311-1938: Modeling the EBL Absorption