Discovery of very high energy gamma-ray emission from the blazar 1ES 1727+502 with the MAGIC Telescopes

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[1] Aleksić, J.
[2] Antonelli, L.A.
[3] Antoranz, P.
[4] Asensio, M.
[5] Backes, M.
[6] Barres De Almeida, U.
[7] Barrio, J.A.
[8] Becerra González, J.
[9] Bednarek, W.
[10] 7,Berger, K.
[11] Bernardini, E.
[12] Biland, A.
[13] Blanch, O.
[14] Bock, R.K.
[15] Boller, A.
[16] Bonnefoy, S.
[17] Bonnoli, G.
[18] 6,Borla Tridon, D.
[19] Borracci, F.
[20] Bretz, T.
[21] Carmona, E.
[22] Carosi, A.
[23] 4,Carreto Fidalgo, D.
[24] Colin, P.
[25] Colombo, E.
[26] Contreras, J.L.
[27] Cortina, J.
[28] Cossio, L.
[29] Covino, S.
[30] Da Vela, P.
[31] 14,Dazzi, F.
[32] De Angelis, A.
[33] De Caneva, G.
[34] De Lotto, B.
[35] Delgado Mendez, C.
[36] Doert, M.
[37] 15,Domínguez, A.
[38] Dominis Prester, D.
[39] Dorner, D.
[40] Doro, M.
[41] Eisenacher, D.
[42] Elsaesser, D.
[43] Farina, E.
[44] Ferenc, D.
[45] Fonseca, M.V.
[46] Font, L.
[47] Fruck, C.
[48] 7,García López, R.J.
[49] Garczarczyk, M.
[50] Garrido Terrats, D.
来源：
Berger, K. (berger.karsten@gmail.com) | 1600年 / EDP Sciences卷 / 563期
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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) γ 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; 0.1 GeV-100 GeV) γ-ray data from the Fermi-LAT instrument. We detected; for the first time; VHE γ-ray emission from 1ES 1727+502 at a statistical significance of 5.5σ. 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. © 2014 ESO;
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