Speaker
Dr
Ulisses Barres de Almeida
(Centro Brasileiro de Pesquisas Físicas)
Description
The Fermi-LAT sources and specially the high-energy catalogues, 2FHL and 3FHL, provide the best unbiased proxy to the very-high energy (VHE, E > 100 GeV) extragalactic sky. Meaningful extrapolations can be derived therefrom, as to what are the expectations for future studies in this extreme observational window. Recent observational data in hard X-rays support the existence of a population of extreme high-energy synchrotron peaked blazar sources (EHSPs), composed of objects with a synchrotron peak frequency above 1E17 Hz. Observations with the current generation of VHE instruments, as well as Fermi-LAT seem to corroborate the existence of a population of EHSPs with inverse-Compton (IC) peak above 100 GeV in the γ-ray band. Current observations might nevertheless be probing only the low-energy side of the IC component, which could easily reach beyond the TeV range. As a result, these putative EHSPs are clearly undersampled by Fermi-LAT. In this talk, I will present the Cherenkov Telescope Array (CTA), whose first prototype telescope on site has just been inaugurated in La Palma last October. I intend to show that future VHE observations with CTA, covering the range between 20 GeV to 300 TeV, are in a good position to probe the poorly known class of extreme HSP sources, expanding our understanding of the blazar phenomenology and bringing new elements to a unified model of jetted active galactic nuclei.
Are you presenting on behalf of collaborations or institutions?
for the CTA Consortium
Primary author
Dr
Ulisses Barres de Almeida
(Centro Brasileiro de Pesquisas Físicas)
