Long-term multiwavelength view and modeling of the blazar B2 1811+31 in high state

Cerasole D, Loporchio S, Abe K, Abe S, Abhir J, Abhishek A, Acciari VA, Aguasca-Cabot A, Agudo I, Aniello T, Ansoldi S, Antonelli LA, Arbet Engels A, Arcaro C, Asano K, Babić A, de Almeida UB, Barrio JA, Barrios-Jiménez L, Batković I, Baxter J, González JB, Bednarek W, Bernardini E, Bernete J, Berti A, Besenrieder J, Bigongiari C, Biland A, Blanch O, Bonnoli G, Bošnjak , Bronzini E, Burelli I, Campoy-Ordaz A, Carosi A, Carosi R, Carretero-Castrillo M, Castro-Tirado AJ, Cerasole D, Ceribella G, Chilingarian A, Cifuentes A, Colombo E, Contreras JL, Cortina J, Covino S, D’Ammando F, D’Amico G, Da Vela P, Dazzi F, De Angelis A, De Lotto B, de Menezes R, Delfino M, Delgado J, Mendez CD, Di Pierro F, Di Tria R, Di Venere L, Dinesh A, Prester DD, Donini A, Dorner D, Doro M, Eisenberger L, Elsaesser D, Escudero J, Fariña L, Foffano L, Font L, Fröse S, Fukazawa Y, López RJ, Garczarczyk M, Gasparyan S, Gaug M, Paiva JG, Giglietto N, Giordano F, Gliwny P, Gradetzke T, Grau R, Green D, Green JG, Günther P, Hadasch D, Hahn A, Hassan T, Heckmann L, Llorente JH, Hrupec D, Imazawa R, Israyelyan D, Itokawa T, Martínez IJ, Quiles JJ, Jormanainen J, Kankkunen S, Kayanoki T, Kerszberg D, Khachatryan M, Kluge GW, Kobayashi Y, Konrad J, Kouch PM, Kubo H, Kushida J, Láinez M, Lamastra A, Lindfors E, Lombardi S, Longo F, López-Coto R, López-Moya M, López-Oramas A, Loporchio S, Lorini A, Lulić L, Lyard E, Majumdar P, Makariev M, Maneva G, Manganaro M, Mangano S, Mannheim K, Mariotti M, Martínez M, Maruševec P, Mas-Aguilar A, Mazin D, Menchiari S, Mender S, Miceli D, Miranda JM, Mirzoyan R, González MM, Molina E, Mondal HA, Moralejo A, Nakamori T, Nanci C, Neustroev V, Nickel L, Rosillo MN, Nigro C, Nikolić L, Nilsson K, Nishijima K, Ekoume TN, Noda K, Nozaki S, Okumura A, Paiano S, Paneque D, Paoletti R, Paredes JM, Pavletić L, Peresano M, Persic M, Pihet M, Pirola G, Podobnik F, Moroni PG, Prandini E, Principe G, Rhode W, Ribó M, Rico J, Righi C, Sahakyan N, Saito T, Saturni FG, Schmitz K, Schmuckermaier F, Schubert JL, Sciaccaluga A, Silvestri G, Sitarek J, Sliusar V, Sobczynska D, Stamerra A, Strišković J, Strom D, Strzys M, Suda Y, Tajima H, Takahashi M, Takeishi R, Temnikov P, Terauchi K, Terzić T, Teshima M, Tutone A, Ubach S, van Scherpenberg J, Acosta MV, Ventura S, Verna G, Viale I, Vigliano A, Vigorito CF, Vitale V, Vovk I, Walter R, Wersig F, Will M, Yamamoto T, Bartolini C, Bissaldi E, Garrappa S, Ankara E, Bader N, Feige M, Hümmer F, Kaplan F, Lorey C, Reinhart D, Schoch K, Steineke R, Marchini A, Ramazani VF, Graham MJ, Hovatta T, Kiehlmann S, Readhead AC, Benke P, Eppel F, Hämmerich S, Heßdörfer J, Kadler M, Kirchner D, Gokus A, Paraschos GF, Rösch F, Sinapius J (2025)

Publication Type: Conference contribution

Publication year: 2025

Journal

Publisher: Sissa Medialab Srl

Book Volume: 501

Conference Proceedings Title: Proceedings of Science

Event location: Geneva, CHE

DOI: 10.22323/1.501.0599

Abstract

Intermediate synchrotron-peaked BL Lacs (IBLs) are quite rare sources in the very high-energy (VHE; 100 GeV < E < 100 TeV) γ-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 (MWL) instruments from radio up to γ rays. The observations carried out by the MAGIC telescopes led to the first-time detection of VHE γ-ray emission from B2 1811+31. In this contribution, we highlight the key results of our recent study [1], which offers a comprehensive analysis of the source emission both during the 2020 high-activity state and during the quiescent state. Using a comprehensive MWL dataset, we contextualize this high-state episode within the source emissions over 18 years, from 2005 to 2024. We attribute the VHE γ-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 MWL emission during the 2020 flaring state.

Authors with CRIS profile

Involved external institutions

National Institute for Nuclear Physics / Istituto Nazionale di Fisica Nucleare (INFN) Italy (IT) Tokai University / 東海大学 (Tōkai Daigaku) Japan (JP) University of Tokyo Japan (JP) Julius-Maximilians-Universität Würzburg Germany (DE) Eidgenössische Technische Hochschule Zürich (ETHZ) / Swiss Federal Institute of Technology in Zurich Switzerland (CH) Università degli Studi di Siena (UNISI) / University of Siena Italy (IT) Institut de Fisica d'Altes Energies (IFAE) / The Institute for High Energy Physics Spain (ES) Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT) Spain (ES) Universitat de Barcelona (UB) / University of Barcelona Spain (ES) Hiroshima University / 広島大学 Japan (JP) Institute of Astrophysics of Andalusia / Instituto de Astrofísica de Andalucía (IAA-CSIC) Spain (ES) International Center for Relativistic Astrophysics Network (ICRANet) Armenia (AM) National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF) Italy (IT) University of Padua / Universita degli Studi di Padova Italy (IT) Autonomous University of Barcelona (UAB) / Universitat Autònoma de Barcelona Spain (ES) University of Udine / Università degli Studi di Udine Italy (IT) University of Pisa / Università di Pisa (UniPi) Italy (IT) Politecnico di Bari Italy (IT) Yerevan Physics Institute (YerPhI) / Երևանի Ֆիզիկայի Ինստիտուտ Armenia (AM) University of Zagreb / Sveučilište u Zagrebu Croatia (HR) Universidad Complutense de Madrid (UCM) Spain (ES) Brazilian Center for Physics Research / Centro Brasileiro de Pesquisas Físicas (CBPF) Brazil (BR) Technische Universität Dortmund Germany (DE) University of Bergen / Universitetet i Bergen Norway (NO) Universidad de La Laguna Spain (ES) Turku University Hospital / Turun yliopistollinen keskussairaala (TYKS) Finland (FI) University of Lodz / Uniwersytet Łódzki Poland (PL) Josip-Juraj-Strossmayer-Universität Osijek Croatia (HR) Sveučilište u Rijeci / University of Rijeka Croatia (HR) University of Geneva / Université de Genève (UNIGE) Switzerland (CH) Homi Bhabha National Institute (HBNI) India (IN) Institute for Nuclear Researches and Nuclear Energy (INRNE) / Институт за ядрени изследвания и ядрена енергетика (ИЯИЯЕ) Bulgaria (BG) Yamagata University (YU) Japan (JP) Oulun Yliopisto / University of Oulo Finland (FI) Nagoya University / 名古屋大学 Japan (JP) University of Turin / Università degli Studi di Torino (UNITO) Italy (IT) Chiba University / 千葉大学 Japan (JP) Kyoto University / 京都大学 Kyōto daigaku Japan (JP) Hans-Haffner-Sternwarte Hettstadt Germany (DE) Deutsches Elektronen-Synchrotron DESY Germany (DE) California Institute of Technology (Caltech) United States (USA) (US) Foundation for Research and Technology-Hellas (FORTH) / Ίδρυμα Τεχνολογίας και Έρευνας Greece (GR) Konan University / 甲南大学 Japan (JP) Weizmann Institute of Science Israel (IL) Max-Planck-Institut für Radioastronomie / Max Planck Institute for Radio Astronomy Germany (DE)

How to cite

APA:

Cerasole, D., Loporchio, S., Abe, K., Abe, S., Abhir, J., Abhishek, A.,... Sinapius, J. (2025). Long-term multiwavelength view and modeling of the blazar B2 1811+31 in high state. In Proceedings of Science. Geneva, CHE: Sissa Medialab Srl.

MLA:

Cerasole, D., et al. "Long-term multiwavelength view and modeling of the blazar B2 1811+31 in high state." Proceedings of the 39th International Cosmic Ray Conference, ICRC 2025, Geneva, CHE Sissa Medialab Srl, 2025.

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