Details

Autor(en) / Beteiligte

• Ahnen, M. L.
• Ansoldi, S.
• Antonelli, L. A.
• Antoranz, P.
• Arcaro, C.
• Banerjee, B.
• Bangale, P.
• Barres de Almeida, U.
• Barrio, J. A.
• Becerra González, J.
• Bednarek, W.
• Bonnefoy, S.
• Bonnoli, G.
• Borracci, F.
• Bretz, T.
• Buson, S.
• Carosi, A.
• Colin, P.
• Contreras, J. L.
• Cortina, J.
• Da Vela, P.
• De Lotto, B.
• Di Pierro, F.
• Doert, M.
• Dominis Prester, D.
• Dorner, D.
• Doro, M.
• Einecke, S.
• Eisenacher Glawion, D.
• Elsaesser, D.
• Engelkemeier, M.
• Fernández-Barral, A.
• Fidalgo, D.
• Fonseca, M. V.
• Frantzen, K.
• Fruck, C.
• Galindo, D.
• García López, R. J.
• Garrido Terrats, D.
• Gaug, M.
• Gora, D.
• Guberman, D.
• Herrera, J.
• Hose, J.
• Hughes, G.
• Idec, W.
• Kodani, K.
• Konno, Y.
• Kubo, H.
• Kushida, J.
• La Barbera, A.
• Lindfors, E.
• Longo, F.
• López, M.
• López-Coto, R.
• Majumdar, P.
• Makariev, M.
• Maneva, G.
• Mannheim, K.
• Mirzoyan, R.
• Nakajima, D.
• Neustroev, V.
• Nishijima, K.
• Noda, K.
• Nogués, L.
• Palacio, J.
• Paneque, D.
• Paoletti, R.
• Paredes, J. M.
• Pedaletti, G.
• Peresano, M.
• Perri, L.
• Persic, M.
• Poutanen, J.
• Prandini, E.
• Garcia, J. R.
• Reichardt, I.
• Rhode, W.
• Rico, J.
• Saito, T.
• Satalecka, K.
• Schroeder, S.
• Schweizer, T.
• Shore, S. N.
• Sillanpää, A.
• Snidaric, I.
• Sobczynska, D.
• Strzys, M.
• Surić, T.
• Takalo, L.
• Tavecchio, F.
• Terzić, T.
• Tescaro, D.
• Teshima, M.
• Toyama, T.
• Vanzo, G.
• Verguilov, V.
• Vovk, I.
• Will, M.
• Wu, M. H.

Titel

Detection of very high energy gamma-ray emission from the gravitationally lensed blazar QSO B0218+357 with the MAGIC telescopes

Ist Teil von

• Astronomy and astrophysics (Berlin), 2016-11, Vol.595, p.A98

Ort / Verlag

United States: EDP Sciences

Erscheinungsjahr

2016

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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.