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The REX (Radio-Emitting X-ray sources) is a catalogue produced bycross-matching X-ray data from the ROSAT-PSPC archive of pointed observationsand radio data from the NRAO VLA Sky Survey, aimed at the selection of blazars.From the REX catalogue, we select a well defined and statistically completesample of high-energy peaked BL Lac (HBL). HBL are expected to be the mostnumerous class of extragalactic TeV emitting sources. Specifically, we haveconsidered only the REX sources in the currently planned CTA extragalacticsurvey area satisfying specific criteria and with an optical spectroscopicconfirmation. We obtain 46 HBL candidates that we called Te-REX (TeV-emittingREX). We estimate the very high-energy gamma-ray emission, in the TeV domain,using an empirical approach i.e. using specific statistical relations betweengamma-rays (at GeV energies) and radio/X-rays properties observed in bright HBLfrom the literature. We compare the spectral energy distributions (SEDs) withthe sensitivities of current and upcoming Cherenkov telescopes and we predictthat 14 Te-REX could be detectable with 50 hours of observations of CTA and 7of them also with current Cherenkov facilities in 50 hours. By extrapolatingthese numbers on the total extragalactic sky, we predict that about 800 HBLcould be visible in pointed CTA observations and about 400 with currentCherenkov telescopes in 50 hours. Interestingly, our predictions show that anon-negligible fraction (about 30%) of the HBL that will be detectable by CTAis composed of relatively weak objects whose optical nuclear emission isswamped by the host-galaxy light and not (yet) detected by Fermi-LAT.

Te-REX: a sample of extragalactic TeV-emitting candidates