Predictions of TeV emission for a set of hard BL Lac objects

Predictions of TeV emission for a set of hard BL Lac objects

ABSTRACT We focus our analysis on 55 BL Lac objects with a hard Fermi gamma-ray spectrum, and for which a redshift or a lower limit to it has been determined by a previous study of ours. We extrapolate the spectral fits given by the 4FGL catalogue to the VHE band (>0.1 TeV), which can be explored...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2021-12, Vol.508 (4), p.6128-6141
Hauptverfasser: Paiano, Simona, Treves, Aldo, Franceschini, Alberto, Falomo, Renato
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creator Paiano, Simona
Treves, Aldo
Franceschini, Alberto
Falomo, Renato
description ABSTRACT We focus our analysis on 55 BL Lac objects with a hard Fermi gamma-ray spectrum, and for which a redshift or a lower limit to it has been determined by a previous study of ours. We extrapolate the spectral fits given by the 4FGL catalogue to the VHE band (>0.1 TeV), which can be explored by imaging atmospheric Cherenkov telescopes. Furthermore, we take into account the absorption due to the extragalactic background light, strongly depending on the redshift. Finally, we compare our results with publicly available sensitivity curves for a selection of imaging atmospheric Cherenkov telescope arrays currently operating or under construction. From our extrapolations and simulations we find a large number of promising candidates for observation with the forthcoming Cherenkov Telescope Array observatory.
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title Predictions of TeV emission for a set of hard BL Lac objects
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