Abe K, Abe S, Abhir J, Abhishek A, Acciari VA, Aguasca-Cabot A, Agudo I, Aniello T, Ansoldi S, Antonelli LA, Engels AA, 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, Vela PD, Dazzi F, De Angelis A, De Lotto B, de Menezes R, Delfino M, Delgado J, Mendez CD, Pierro FD, Tria RD, Venere LD, 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: Journal article
Publication year: 2025
Book Volume: 697
Article Number: A172
DOI: 10.1051/0004-6361/202452942
Context. Among the blazars whose emission has been detected up to very high-energy (VHE; 100 GeV < E < 100 TeV) γ rays, intermediate synchrotron-peaked BL Lacs (IBLs) are quite rare. The IBL B2 1811+31 (z = 0.117) exhibited intense flaring activity in 2020. Detailed characterization of the source emission from radio to γ-ray energies was achieved with quasi-simultaneous observations, which led to the first-time detection of VHE γ-ray emission from the source with the MAGIC telescopes. Aims. In this work, we present a comprehensive multiwavelength (MWL) view of B2 1811+31, with a specific focus on the 2020 VHE flare, employing data from MAGIC, Fermi-LAT, Swift-XRT, Swift-UVOT, and several optical and radio ground-based telescopes. Methods. Long-term MWL data were employed to contextualize the high-state episode within the source emissions over 18 years. We investigated the variability, cross-correlations, and classification of the source emissions during low and high states. We propose an interpretative leptonic model for the observed radiative high state. Results. During the 2020 flaring state, the synchrotron peak frequency shifted to higher values and reached the limit of the IBL classification. Variability in timescales of a few hours in the high-energy (HE; 100 MeV < E < 100 GeV) γ-ray band poses an upper limit of 6 × 1014 δ
APA:
Abe, K., Abe, S., Abhir, J., Abhishek, A., Acciari, V.A., Aguasca-Cabot, A.,... Sinapius, J. (2025). Very high-energy gamma-ray detection and long-term multiwavelength view of the flaring blazar B2 1811+31. Astronomy & Astrophysics, 697. https://doi.org/10.1051/0004-6361/202452942
MLA:
Abe, K., et al. "Very high-energy gamma-ray detection and long-term multiwavelength view of the flaring blazar B2 1811+31." Astronomy & Astrophysics 697 (2025).
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