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https://hdl.handle.net/2440/116440
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Type: | Journal article |
Title: | Detection of very high energy gamma-ray emission from the gravitationally lensed blazar QSO B0218+357 with the MAGIC telescopes |
Author: | Ahnen, M. Ansoldi, S. Antonelli, L. Antoranz, P. Arcaro, C. Babic, A. Banerjee, B. Bangale, P. Barres De Almeida, U. Barrio, J. Becerra González, J. Bednarek, W. Bernardini, E. Berti, A. Biasuzzi, B. Biland, A. Blanch, O. Bonnefoy, S. Bonnoli, G. Borracci, F. et al. |
Citation: | Astronomy and Astrophysics: a European journal, 2016; 595:A98-1-A98-11 |
Publisher: | EDP Sciences |
Issue Date: | 2016 |
ISSN: | 0004-6361 1432-0746 |
Statement of Responsibility: | M. L. Ahnen, S. Ansoldi, L. A. Antonelli, P. Antoranz, C. Arcaro ... Sabrina Einecke ... et al. |
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. |
Keywords: | gamma rays: galaxies – gravitational lensing: strong – galaxies: jets – radiation mechanisms: non-thermal – quasars: individual: QSO B0218+357 |
Rights: | © ESO 2016 |
DOI: | 10.1051/0004-6361/201629461 |
Published version: | http://dx.doi.org/10.1051/0004-6361/201629461 |
Appears in Collections: | Aurora harvest 8 Physics publications |
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