Further evidence of superluminal active galactic nuclei as γ‐ray sources

Abstract

AbstractIn our previous work in Xiao et al. (SCPMA, 2019, 62, 129811), we suggested that six superluminal sources could be γ‐ray candidates, and in fact, five of them have been confirmed in the fourth Fermi‐LAT source catalog (4FGL). In this work, based on the 4FGL, we report a sample of 229 Fermi detected superluminal sources (FDSs), including 40 new FDSs and 62 non‐FDSs. Thus, we believe that all superluminal sources should have γ‐ray emissions, and superluminal motion could also be a clue to detect γ‐ray emission from active galactic nuclei. We present a new approach of Doppler factor estimate through the study of the γ‐ray luminosity (Lγ) and of the viewing angle (ϕ).