Multiwavelength observations in 2019-2020 of a new very-high-energy gamma-ray emitter: the flat spectrum radio quasar QSO B1420+326

Filippo D’Ammando,Roberto Angioni,Monica Orienti,Julian Sitarek,Seiya Nozaki,Elina Lindfors,Giacomo Bonnoli,Vandad Fallah Ramazani,Svetlana G. Jorstad, Victor A. Acciari,Stefano Ansoldi,Lucio Angelo Antonelli,Axel Arbet Engels,Manuel Artero,Katsuaki Asano,Dominik Baack,Ana Babic,Andrés Baquero,Ulisses Barres de Almeida,Juan Abel Barrio,Ivana Batković,Josefa Becerra Gonzalez,Wlodek Bednarek,Lorenzo Bellizzi,Elisa Bernardini,Maria-Isabel Bernardos,Alessio Berti,Jürgen Besenrieder,Wrijupan Bhattacharyya,Ciro Bigongiari,Adrian Biland,Oscar Blanch, Hendrik Bökenkamp,Zeljka Bosnjak,Giovanni Busetto, Roberto Carosi,Giovanni Ceribella,Matteo Cerruti,Yating Chai,Ashot Chilingarian,Stefan Cikota,Sidika Merve Colak,Eduardo Colombo,Jose Luis Contreras,Juan Cortina,Stefano Covino,Giacomo D'Amico,Valerio D'Elia,Paolo Da Vela,Francesco Dazzi,Alessandro De Angelis,Barbara De Lotto,Manuel Delfino,Jordi Delgado,Carlos Delgado Mendez,Davide Depaoli,Federico Di Pierro,Leonardo Di Venere,Elia Do Souto Espiñeira,Dijana Dominis Prester,Alice Donini,Daniela Dorner,Michele Doro,Dominik Elsaesser,Alicia Fattorini,Maria Victoria Fonseca,Lluis Font,Christian Fruck,Satoshi Fukami,Yasushi Fukazawa,Ramon J. García López,Markus Garczarczyk,Sargis Gasparyan,Markus Gaug,Nicola Giglietto,Francesco Giordano,Pawel Gliwny,Nikola Godinovic,David Green,Jarred Gershon Green,Daniela Hadasch,Alexander Hahn,Lea Heckmann,Javier Herrera,John Hoang,Dario Hrupec,Moritz Hütten,Tomohiro Inada,Kazuma Ishio,Yuki Iwamura,Irene Jiménez Martínez,Jenni Jormanainen,Léa Jouvin,Marie Karjalainen,Daniel Kerszberg,Yukiho Kobayashi,Hidetoshi Kubo,Junko Kushida,Alessandra Lamastra,Damir LELAS,Francesco Leone,Lena Linhoff,Saverio Lombardi,Francesco Longo,Ruben Lopez-Coto,Marcos López-Moya,Alicia López-Oramas,Serena Loporchio,Bernardo Machado de Oliveira Fraga, Camilla Maggio,Pratik Majumdar,Martin MAKARIEV,Manuela Mallamaci, Galina Maneva,Marina Manganaro,Karl Mannheim,Laura Maraschi,Mosè Mariotti,Manel Martinez,Daniel Mazin,Stefano Menchiari,Simone Mender,Saša Mićanović,Davide Miceli,Tjark Miener,Jose Miguel Miranda,Razmik Mirzoyan,Edgar Molina,Abelardo Moralejo,Daniel Morcuende,Victoria Moreno,Elena Moretti,Takeshi Nakamori,Lara Nava,Vitaly Neustroev,Cosimo Nigro,Kari Nilsson,Kyoshi Nishijima,Koji Noda,Yoshiki Ohtani,Tomohiko Oka,Jorge Otero-Santos,Simona Paiano,Michele Palatiello,David Paneque,Riccardo Paoletti,Josep M. Paredes,Lovro Pavletić,Pablo Peñil,Massimo Persic,Marine Pihet,Pier Giorgio Prada Moroni,Elisa Prandini,Chaitanya Priyadarshi,Ivica Puljak,Wolfgang Rhode,Marc Ribó,Javier Rico,Chiara Righi,Andrea Rugliancich,Narek Sahakyan,Takayuki Saito,Shunsuke Sakurai,Konstancja Satalecka,Francesco Gabriele Saturni,Bernd Schleicher,Kevin Schmidt,Thomas Schweizer,Iva Šnidarić,Dorota Sobczyńska,Alessia Spolon,Antonio Stamerra,Jelena Strišković,Derek Strom,Marcel Strzys,Yusuke Suda,Tihomir Surić,Mitsunari Takahashi,Ryuji Takeishi,Fabrizio Tavecchio,Petar Temnikov,Tomislav Terzic,Masahiro Teshima,Luca Tosti,Stefano Truzzi,Antonio Tutone, Santiago Ubach,Juliane van Scherpenberg,Gaia Vanzo,Monica VAZQUEZ ACOSTA,Sofia Ventura,Vassil VERGUILOV,Carlo Francesco Vigorito,Vincenzo Vitale,Ievgen Vovk,Martin Will,Carolin Wunderlich,Tokonatsu Yamamoto,Darko Zarić

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)(2021)

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摘要
The flat-spectrum radio quasar QSO B1420+326 underwent an enhanced $\gamma$-ray flux state seen by Fermi-LAT at the turn of 2019/2020. Compared to the low state both the position and luminosity of the two spectral energy distribution peaks changed by at least two orders of magnitude. The high state resulted in the discovery of the very-high-energy (>100 GeV) $\gamma$-ray emission from the source by the MAGIC telescopes. The organized multiwavelength campaign allow us to trace the broadband emission of the source through different phases of the flaring activity. The source was observed by 20 instruments in radio, near-infrared, optical, ultra-violet, X-ray and $\gamma$-ray bands. We use dedicated optical spectroscopy results to estimate the accretion disc and the dust torus luminosity. The optical spectroscopy shows a prominent FeII bump with flux evolving together with the continuum emission and a MgII line with varying equivalent width. The $\gamma$-ray flare was accompanied by a rotation of the optical polarization vector and emission of a new superluminal radio knot. We model spectral energy distributions in different flare phases in the framework of combined synchrotron-self-Compton and external Compton scenario in which the shape of the electron energy distribution is determined from cooling processes.
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flat spectrum radio,qso b1420+326,very-high-energy,gamma-ray
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