Detection of very high energy gamma-ray emission from the gravitationally lensed blazar QSO B0218+357 with the MAGIC telescopes
Journal
Date Issued
2016
Author(s)
Ahnen, M. L.
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Ansoldi, S.
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Antoranz, P.
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Arcaro, C.
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Babic, A.
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Banerjee, B.
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Bangale, P.
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Barres de Almeida, U.
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Barrio, J. A.
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Becerra González, J.
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Nilsson, K.
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Nishijima, K.
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Noda, K.
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Nogués, L.
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Palacio, J.
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Palatiello, M.
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Paneque, D.
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Paoletti, R.
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Paredes, J. M.
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Bednarek, W.
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Paredes-Fortuny, X.
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Pedaletti, G.
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Peresano, M.
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Perri, L.
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Poutanen, J.
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Prada Moroni, P. G.
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Puljak, I.
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Garcia, J. R.
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Bernardini, E.
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Reichardt, I.
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Rhode, W.
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Ribó, M.
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Rico, J.
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Saito, T.
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Satalecka, K.
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Schroeder, S.
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Schweizer, T.
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Shore, S. N.
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Sillanpää, A.
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Berti, A.
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Sitarek, J.
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Snidaric, I.
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Sobczynska, D.
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Strzys, M.
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Surić, T.
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Takalo, L.
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Temnikov, P.
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Terzić, T.
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Biasuzzi, B.
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Tescaro, D.
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Teshima, M.
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Torres, D. F.
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Toyama, T.
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Treves, A.
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Vanzo, G.
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Verguilov, V.
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Vovk, I.
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Ward, J. E.
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Will, M.
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Biland, A.
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Wu, M. H.
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Zanin, R.
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Desiante, R.
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Blanch, O.
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Bonnefoy, S.
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Borracci, F.
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Bretz, T.
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Buson, S.
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Chatterjee, A.
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Clavero, R.
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Colin, P.
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Colombo, E.
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Contreras, J. L.
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Cortina, J.
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Da Vela, P.
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De Angelis, A.
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De Lotto, B.
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de Oña Wilhelmi, E.
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Di Pierro, F.
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Doert, M.
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Domínguez, A.
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Dominis Prester, D.
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Dorner, D.
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Doro, M.
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Einecke, S.
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Eisenacher Glawion, D.
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Elsaesser, D.
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Engelkemeier, M.
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Fallah Ramazani, V.
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Fernández-Barral, A.
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Fidalgo, D.
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Fonseca, M. V.
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Font, L.
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Frantzen, K.
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Fruck, C.
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Galindo, D.
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García López, R. J.
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Garczarczyk, M.
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Garrido Terrats, D.
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Gaug, M.
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Giammaria, P.
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Godinović, N.
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Gora, D.
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Guberman, D.
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Hadasch, D.
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Hahn, A.
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Hayashida, M.
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Herrera, J.
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Hose, J.
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Hrupec, D.
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Hughes, G.
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Idec, W.
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Kodani, K.
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Konno, Y.
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Kubo, H.
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Kushida, J.
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Lelas, D.
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Lindfors, E.
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Longo, F.
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López, M.
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López-Coto, R.
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Majumdar, P.
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Makariev, M.
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Mallot, K.
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Maneva, G.
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Manganaro, M.
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Mannheim, K.
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Maraschi, L.
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Marcote, B.
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Mariotti, M.
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Martínez, M.
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Mazin, D.
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Menzel, U.
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Miranda, J. M.
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Mirzoyan, R.
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Moralejo, A.
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Moretti, E.
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Nakajima, D.
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Neustroev, V.
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Niedzwiecki, A.
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Nievas Rosillo, M.
Abstract
Context. QSO B0218+357 is a gravitationally lensed blazar located at a redshift of 0.944. The gravitational lensing splits the emitted radiation into two components that are spatially indistinguishable by gamma-ray instruments, but separated by a 10-12 day delay. In July 2014, QSO B0218+357 experienced a violent flare observed by the Fermi-LAT and followed by the MAGIC telescopes.
Aims: The spectral energy distribution of QSO B0218+357 can give information on the energetics of z 1 very high energy gamma-ray sources. Moreover the gamma-ray emission can also be used as a probe of the extragalactic background light at z 1.
Methods: MAGIC performed observations of QSO B0218+357 during the expected arrival time of the delayed component of the emission. The MAGIC and Fermi-LAT observations were accompanied by quasi-simultaneous optical data from the KVA telescope and X-ray observations by Swift-XRT. We construct a multiwavelength spectral energy distribution of QSO B0218+357 and use it to model the source. The GeV and sub-TeV data obtained by Fermi-LAT and MAGIC are used to set constraints on the extragalactic background light.
Results: Very high energy gamma-ray emission was detected from the direction of QSO B0218+357 by the MAGIC telescopes during the expected time of arrival of the trailing component of the flare, making it the farthest very high energy gamma-ray source detected to date. The observed emission spans the energy range from 65 to 175 GeV. The combined MAGIC and Fermi-LAT spectral energy distribution of QSO B0218+357 is consistent with current extragalactic background light models. The broadband emission can be modeled in the framework of a two-zone external Compton scenario, where the GeV emission comes from an emission region in the jet, located outside the broad line region.
Aims: The spectral energy distribution of QSO B0218+357 can give information on the energetics of z 1 very high energy gamma-ray sources. Moreover the gamma-ray emission can also be used as a probe of the extragalactic background light at z 1.
Methods: MAGIC performed observations of QSO B0218+357 during the expected arrival time of the delayed component of the emission. The MAGIC and Fermi-LAT observations were accompanied by quasi-simultaneous optical data from the KVA telescope and X-ray observations by Swift-XRT. We construct a multiwavelength spectral energy distribution of QSO B0218+357 and use it to model the source. The GeV and sub-TeV data obtained by Fermi-LAT and MAGIC are used to set constraints on the extragalactic background light.
Results: Very high energy gamma-ray emission was detected from the direction of QSO B0218+357 by the MAGIC telescopes during the expected time of arrival of the trailing component of the flare, making it the farthest very high energy gamma-ray source detected to date. The observed emission spans the energy range from 65 to 175 GeV. The combined MAGIC and Fermi-LAT spectral energy distribution of QSO B0218+357 is consistent with current extragalactic background light models. The broadband emission can be modeled in the framework of a two-zone external Compton scenario, where the GeV emission comes from an emission region in the jet, located outside the broad line region.
Volume
595
Start page
A98
Issn Identifier
0004-6361
Ads BibCode
2016A&A...595A..98A
Rights
open.access
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