A1 Refereed original research article in a scientific journal
Te-REX: a sample of extragalactic TeV-emitting candidates
Authors: Balmaverde B, Caccianiga A, Della Ceca R, Wolter A, Belfiore A, Ballo L, Berton M, Gioia I, Maccacaro T, Sbarufatti B
Publisher: OXFORD UNIV PRESS
Publication year: 2020
Journal: Monthly Notices of the Royal Astronomical Society
Journal name in source: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Journal acronym: MON NOT R ASTRON SOC
Volume: 492
Issue: 3
First page : 3728
Last page: 3741
Number of pages: 14
ISSN: 0035-8711
eISSN: 1365-2966
DOI: https://doi.org/10.1093/mnras/stz3532
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/46521894
The REX (Radio-Emitting X-ray sources) is a catalogue produced by cross-matching X-ray data from the ROSAT-PSPC archive of pointed observations and 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 complete sample of high-energy peaked BE Lac (HBL). HIM are expected to be the most numerous class of extragalactic TeV-emitting sources. Specifically, we have considered only the REX sources in the currently planned CIA extragalactic survey area satisfying specific criteria and with an optical spectroscopic confirmation. We obtain 46 HBL candidates that we called Te-REX (TeV-emitting REX). We estimate the very high-energy gamma-ray emission, in the TeV domain, using an empirical approach i.e. using specific statistical relations between gamma-rays (at GeV energies) and radio/X-rays properties observed in bright IIBL from the literature. We compare the spectral energy distributions (SEDs) with the sensitivities of current and upcoming Cherenkov telescopes and we predict that 14 Te-REX could he detectable with 50 h of observations of CTA and 7 of them also with current Cherenkov facilities in 50 h. By extrapolating these numbers on the total extragalactic sky, we predict that about 800 HBL could be visible in pointed CTA observations and similar to 400 with current Cherenkov telescopes in 50 h. Interestingly, our predictions show that a non negligible fraction (similar to 30 per cent) of the HBL. that will be detectable by CTA is composed of relatively weak objects whose optical nuclear emission is swamped by the host-galaxy light and not (yet) detected by Fermi-LAT.
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