3 papers
astro-ph.GA2026
Optical spectroscopy of high redshift BL Lac objects
Renato Falomo, Aldo Treves, Simona Paiano +1
BL Lac objects (BLL) are defined by the presence of very weak (typically 5 Ã ) or even absent spectral lines. This makes determining their distance particularly challenging, es…
astro-ph.HE2025
Characterization of a sample of -ray active galactic nuclei
Alberto Ulgiati, Paolo Padovani, Paolo Giommi +2
We analyse 77 \textit{Fermi} sources and their potential low-energy counterparts previously proposed in the literature. These sources were classified as active galactic nuclei, mai…
astro-ph.HE2024
Search for the multiwavelength counterparts to extragalactic unassociated Fermi γ-ray sources
Alberto Ulgiati, Simona Paiano, Fabio Pintore +7
Aims. In this paper, we searched for multi-wavelength (X-ray, optical and radio) counterparts to the unassociated gamma-ray sources (UGS) of the Fermi 4FGL-DR4 catalog. The main go…