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27 April 2024

» arxiv » 1609.1095

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Detection of very high energy gamma-ray emission from the gravitationally-lensed blazar QSO B0218+357 with the MAGIC telescopes
MAGIC Collaboration ; M. L. Ahnen ; S. Ansoldi ; L. A. Antonelli ; P. Antoranz ; C. Arcaro ; A. Babic ; B. Banerjee ; P. Bangale ; U. Barres de Almeida ; J. A. Barrio ; J. Becerra González ; W. Bednarek ; E. Bernardini ; A. Berti ; B. Biasuzzi ; A. Biland ; O. Blanch ; S. Bonnefoy ; G. Bonnoli ; F. Borracci ; T. Bretz ; S. Buson ; A. Carosi ; A. Chatterjee ; R. Clavero ; P. Colin ; E. Colombo ; J. L. Contreras ; J. Cortina ; S. Covino ; P. Da Vela ; F. Dazzi ; A. De Angelis ; B. De Lotto ; E. de Oña Wilhelmi ; F. Di Pierro ; M. Doert ; A. Domínguez ; D. Dominis Prester ; D. Dorner ; M. Doro ; S. Einecke ; D. Eisenacher Glawion ; D. Elsaesser ; M. Engelkemeier ; V. Fallah Ramazani ; A. Fernández-Barral ; D. Fidalgo ; M. V. Fonseca ; L. Font ; K. Frantzen ; C. Fruck ; D. Galindo ; R. J. García López ; M. Garczarczyk ; D. Garrido Terrats ; M. Gaug ; P. Giammaria ; N. Godinović ; D. Gora ; D. Guberman ; D. Hadasch ; A. Hahn ; M. Hayashida ; J. Herrera ; J. Hose ; D. Hrupec ; G. Hughes ; W. Idec ; K. Kodani ; Y. Konno ; H. Kubo ; J. Kushida ; A. La Barbera ; D. Lelas ; E. Lindfors ; S. Lombardi ; F. Longo ; M. López ; R. López-Coto ; P. Majumdar ; M. Makariev ; K. Mallot ; G. Maneva ; M. Manganaro ; K. Mannheim ; L. Maraschi ; B. Marcote ; M. Mariotti ; M. Martínez ; D. Mazin ; U. Menzel ; J. M. Miranda ; R. Mirzoyan ; A. Moralejo ; E. Moretti ; D. Nakajima ; V. Neustroev ; A. Niedzwiecki ; M. Nievas Rosillo ; K. Nilsson ; K. Nishijima ; K. Noda ; L. Nogués ; S. Paiano ; J. Palacio ; M. Palatiello ; D. Paneque ; R. Paoletti ; J. M. Paredes ; X. Paredes-Fortuny ; G. Pedaletti ; M. Peresano ; L. Perri ; M. Persic ; J. Poutanen ; P. G. Prada Moroni ; E. Prandini ; I. Puljak ; J. R. Garcia ; I. Reichardt ; W. Rhode ; M. Ribó ; J. Rico ; T. Saito ; K. Satalecka ; S. Schroeder ; T. Schweizer ; S. N. Shore ; A. Sillanpää ; J. Sitarek ; I. Snidaric ; D. Sobczynska ; A. Stamerra ; M. Strzys ; T. Surić ; L. Takalo ; F. Tavecchio ; P. Temnikov ; T. Terzić ; D. Tescaro ; M. Teshima ; D. F. Torres ; T. Toyama ; A. Treves ; G. Vanzo ; V. Verguilov ; I. Vovk ; J. E. Ward ; M. Will ; M. H. Wu ; R. Zanin ; R. Desiante ;
Date:	5 Sep 2016
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, 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 sources 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 broad band 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.
Source:	arXiv, 1609.1095
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