Excluding possible sites of high-energy emission in 3C 84

• DOI: 10.1093/mnras/staa3521
• Publication Date: 2020-11-12T12:10:17Z
• Authors: Lena Linhoff; Alexander Sandrock; Matthias Kadler; Dominik Elsässer; Wolfgang Rhode
• Keywords: Flare; Black hole (networking)

ABSTRACT The FR-I galaxy 3C 84, that is identified with the misaligned blazar NGC 1275, well known as one of very few radio galaxies emitting gamma-rays in TeV range. Yet, gamma-ray emission region cannot be pinpointed and responsible mechanisms are still unclear. We calculate optical absorption depth high-energy photons broad-line 84 depending on their energy distance to central black hole. Based these calculations, a lower limit from hole can derived. These limits estimated for two geometries (shell ring) states source, low state 2016 October–December flare 2017 January. For shell geometry, we place outside Ly α radius. ring geometry flux activity, minimal between hole, close In case flaring (ring geometry), results not conclusive. Our exclude near origin detected by Fermi–LAT Major Atmospheric Gamma-Ray Imaging Cherenkov. With findings, constrain theoretical models acceleration compare possible source’s morphology resolved images Very Long Baseline Array.