2021/08/05 by Stela S. Boula, Boula, Stela S., A. Mastichiadis +3
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #Neutrino Physics Research #Radio Astronomy Observations and Technology
paper · pdf · doi:10.48550/arxiv.2108.02467
openalex publication_date 2021/08/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Blazars are a sub-category of radio-loud active galactic nuclei with\nrelativistic jets pointing towards the observer. They exhibit non-thermal\nvariable emission, which practically extends over the whole electromagnetic\nspectrum. Despite the plethora of multi-wavelength observations, the origin of\nthe emission in blazar jets remains an open question. In this work, we\nconstruct a two-zone leptonic model: particles accelerate in a small region and\nlose energy through synchrotron radiation and inverse Compton Scattering.\nConsequently, the relativistic electrons escape to a larger area where the\nambient photon field, which is related to Accretion Disk MHD Winds, could play\na central role in the gamma-ray emission. This model explains the Blazar\nSequence and the broader properties of blazars, as determined by Fermi\nobservations, by varying only one parameter, the mass accretion rate onto the\ncentral black hole. Flat Spectrum Radio Quasars have a strong ambient photon\nfield and their gamma-ray emission is dominated by the more extensive zone,\nwhile in the case of BL Lac objects, the negligible ambient photons make the\nsmaller, i.e. acceleration, zone dominant.\n