Year: 2025
Type: conference-paper
Abstract: Intermediate synchrotron-peaked BL Lacs (IBLs) are quite rare sources in the very high-energy (VHE; $100\,\rm GeV < E < 100\,\rm TeV$) $\gamma$-ray sky. The IBL B2 1811+31 ($z = 0.117$) showed intense flaring activity in 2020. This event was detected by a wide range of multiwavelength instruments from radio up to $\gamma$ rays. The observations carried out by the MAGIC telescopes led to the first-time detection of VHE $\gamma$-ray emission from B2 1811+31. In this contribution, we highlight the key results of our recent study \cite{Abe2025}, which offers a comprehensive analysis of the source emission both during the 2020 high-activity state and during the quiescent state. Using a comprehensive dataset, we contextualize this high-state episode within the source emissions over 18 years, from 2005 to 2024. We attribute the VHE $\gamma$-ray emission and the spectral and variability properties in the X-ray band to the electrons and positrons accelerated at the highest energies in the jet of the source. We propose a leptonic two-zone self-consistent model to interpret the observed multiwavelength emission during the 2020 flaring state. In the proposed scenario, the particle distributions in the two emission zones are steady-state solutions of the particle kinetic equation under the effects of injection of a power law spectrum of electrons and positrons, radiative losses and particle escape from the emission regions.
DOI: 10.22323/1.501.0599
Authors: Davide Cerasole, Serena Loporchio, multiwavelength collaborators
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Funders: National Science Foundation, U.S. Department of Energy, National Aeronautics and Space Administration, California Institute of Technology, Centres de Recerca de Catalunya, Deutsche Forschungsgemeinschaft, Ministry of Education, Culture, Sports, Science and Technology, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Bundesministerium für Bildung und Forschung, Generalitat de Catalunya, Centre National d’Etudes Spatiales, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Max-Planck-Gesellschaft, Vetenskapsrådet, Hrvatska Zaklada za Znanost, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Centre National de la Recherche Scientifique, Ministério da Ciência, Tecnologia, Inovações e Comunicações, Instituto de Astrofísica de Canarias, Japan Society for the Promotion of Science, Japan Aerospace Exploration Agency, European Regional Development Fund, Agencia Estatal de Investigación, Institut National de Physique Nucléaire et de Physique des Particules, Institute for Cosmic Ray Research, University of Tokyo, Integrated Electronics Engineering Center, Binghamton University
Awards: G1089506725, G1141912172, G1175115578, G1382750735, G1566079390, G195395952, G2064873908, G2209488408, G2262748287, G2366462802, G2371548206, Fermi gases in complex lattice structures: from Dirac points to Spin liquids, G3005324705, G300979063, G303061748, G3384621141, G3413881215, G34346518, G3480869486, The Radio-Fermi Connection: A Critical Study of Relativistic Jets, G3653389007, G3780874795, G3817602061, G3869365384, G3978510197, Multi-wavelength Observations of Gamma-Ray Blazars - the GLAST Connection, G410571670, G425668148, G4264918310, G4473368111, G451917667, G463062595, G4711507462, G5080475149, Very-high-energy Gamma Ray Astronomy in the Multi-messenger Era, G5438923238, G5570207115, G5894067328, G5915139351, G5967599077, G6656126374, G6791753710, WE PROPOSE TO REVISIT THE IN-SITU HELIOS DATA FOR A MULTI-INSTRUMENT INVESTIGATION OF INNER-HELIOSPHERIC PLASMA HEATING AND THERMALIZATION PROCESSES., G69051668, G702601109, G7321284446, G7425137858, 古代説話における諸寺縁起の研究, ANTHONY REDHEAD/CALIFORNIA INSTITUTE OF TECHNOLOGYMONITORING-1000 GLAST BLAZARS AT 15 GHZ WITH THE O, G8684520763, G8752631986, G8920101981, G929308097, G969889393
OpenAlex ID: W4414479098
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