A model-driven search for extreme BL Lacs among LAT BCU
M. Nievas Rosillo, G. Chiaro, A. Dominguez, G. La Mura (for, the Fermi-LAT collaboration)

TL;DR
This paper identifies potential extreme BL Lac objects among gamma-ray sources by cross-matching catalogs, analyzing multi-wavelength data, modeling their spectra, and proposing a new selection method for VHE observations.
Contribution
It introduces a model-driven approach to select extreme BL Lac candidates for VHE detection, combining catalog cross-matching, spectral analysis, and a novel target selection method.
Findings
Identified 23 high-synchrotron-peaked blazar candidates with multi-wavelength coverage.
Performed detailed spectral modeling including extragalactic background light attenuation.
Proposed a new method for selecting extreme BL Lacs for ground-based VHE telescopes.
Abstract
The emission of very-high-energy photons (VHE, E100 GeV) in active galactic nuclei (AGN) is closely connected with the production of ultra-relativistic particles. Among AGN, the subclass of extreme BL Lacertae are of particular interest because they challenge state-of-art models on how these cosmic particle accelerators operate. By cross-matching two gamma-ray catalogs (this is, 4FGL-DR2 and 2BIGB), we identified 23 high-synchrotron-peaked (HSP) blazar candidates with photometric or spectroscopic redshifts, good multi-wavelength coverage, that are possibly detectable by VHE instruments. We performed a new analysis of Fermi Large Area Telescope data including the effects of attenuation from the extragalactic background light and complemented these results by collecting multiwavelength data from optical, radio and X-ray archival observations. Their broadband spectral energy…
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