A1 Refereed original research article in a scientific journal
Discovery of very high energy gamma-ray emission from the blazar 1ES 1727+502 with the MAGIC Telescopes
Authors: Aleksic J, Antonelli LA, Antoranz P, Asensio M, Backes M, de Almeida UB, Barrio JA, Gonzalez JB, Bednarek W, Berger K, Bernardini E, Biland A, Blanch O, Bock RK, Boller A, Bonnefoy S, Bonnoli G, Tridon DB, Borracci F, Bretz T, Carmona E, Carosi A, Fidalgo DC, Colin P, Colombo E, Contreras JL, Cortina J, Cossio L, Covino S, Da Vela P, Dazzi F, De Angelis A, De Caneva G, De Lotto B, Mendez CD, Doert M, Dominguez A, Prester DD, Dorner D, Doro M, Eisenacher D, Elsaesser D, Farina E, Ferenc D, Fonseca MV, Font L, Fruck C, Lopez RJG, Garczarczyk M, Terrats DG, Gaug M, Giavitto G, Godinovic N, Munoz AG, Gozzini SR, Hadamek A, Hadasch D, Hafner D, Herrero A, Hose J, Hrupec D, Idec W, Jankowski F, Kadenius V, Klepser S, Knoetig ML, Krahenbuhl T, Krause J, Kushida J, La Barbera A, Lelas D, Lewandowska N, Lindfors E, Lombardi S, Lopez M, Lopez-Coto R, Lopez-Oramas A, Lorenz E, Lozano I, Makariev M, Mallot K, Maneva G, Mankuzhiyil N, Mannheim K, Maraschi L, Marcote B, Mariotti M, Martinez M, Masbou J, Mazin D, Meucci M, Miranda JM, Mirzoyan R, Moldon J, Moralejo A, Munar-Adrover P, Nakajima D, Niedzwiecki A, Nilsson K, Nowak N, Orito R, Paiano S, Palatiello M, Paneque D, Paoletti R, Paredes JM, Partini S, Persic M, Prada F, Moroni PGP, Prandini E, Puljak I, Reichardt I, Reinthal R, Rhode W, Ribo M, Rico J, Rugamer S, Saggion A, Saito K, Saito TY, Salvati M, Satalecka K, Scalzotto V, Scapin V, Schultz C, Schweizer T, Shore SN, Sillanpaa A, Sitarek J, Snidaric I, Sobczynska D, Spanier F, Spiro S, Stamatescu V, Stamerra A, Steinke B, Storz J, Sun S, Suric T, Takalo L, Takami H, Tavecchio F, Temnikov P, Terzic T, Tescaro D, Teshima M, Tibolla O, Torres DF, Toyama T, Treves A, Uellenbeck M, Vogler P, Wagner RM, Weitzel Q, Zandanel F, Zanin R, Buson S
Publisher: EDP SCIENCES S A
Publication year: 2014
Journal: Astronomy and Astrophysics
Journal name in source: ASTRONOMY & ASTROPHYSICS
Journal acronym: ASTRON ASTROPHYS
Article number: A90
Volume: 563
Number of pages: 6
ISSN: 0004-6361
DOI: https://doi.org/10.1051/0004-6361/201321360
Motivated by the prediction of a high TeV luminosity we investigated whether the blazar 1ES 1727+502 (z = 0.055) is emitting very high energy (VHE, E > 100 GeV) gamma rays. We observed the BL Lac object 1ES 1727+502 in stereoscopic mode with the two MAGIC telescopes for 14 nights between May 6th and June 10th 2011, for a total effective observing time of 12.6 h. To study the multiwavelength spectral energy distribution (SED), we used simultaneous optical R-band data from the KVA telescope, archival UV/optical and X-ray observations from instruments UVOT and XRT on board of the Swift satellite, and high energy (HE, 0.1GeV-100 GeV) gamma-ray data from the Fermi-LAT instrument. We detected, for the first time, VHE gamma-ray emission from 1ES 1727+502 at a statistical significance of 5.5 sigma. The integral flux above 150 GeV is estimated to be (2.1 +/- 0.4)% of the Crab nebula flux and the de-absorbed VHE spectrum has a photon index of (2.7 +/- 0.5). No significant short-term variability was found in any of the wavebands presented here. We model the SED using a one-zone synchrotron self-Compton model obtaining parameters typical for this class of sources.
