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Title: Observations of the blazar 3C 66A with the magic telescopes in stereoscopic mode
Author: Paredes i Poy, Josep Maria
Bordas Coma, Pol
Bosch i Ramon, Valentí
Ribó Gomis, Marc
Cañellas, A.
Moldón Vara, Francisco Javier
Zabalza de Torres, Víctor
Keywords: Galàxies actives
Raigs gamma
Active galaxies
Gamma rays
Issue Date: 10-Jan-2011
Publisher: Institute of Physics (IOP)
Abstract: We report new observations of the intermediate-frequency peaked BL Lacertae object 3C 66A with the MAGIC telescopes. The data sample we use were taken in 2009 December and 2010 January, and comprises 2.3 hr of good quality data in stereoscopic mode. In this period, we find a significant signal from the direction of the blazar 3C 66A. The new MAGIC stereoscopic system is shown to play an essential role for the separation between 3C 66A and the nearby radio galaxy 3C 66B, which is at a distance of only 6'. The derived integral flux above 100 GeV is 8.3% of the Crab Nebula flux and the energy spectrum is reproduced by a power law of photon index 3.64 ± 0.39stat ± 0.25sys. Within errors, this is compatible with the one derived by VERITAS in 2009. From the spectra corrected for absorption by the extragalactic background light, we only find small differences between the four models that we applied, and constrain the redshift of the blazar to z < 0.68.
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It is part of: Astrophysical Journal, 2011, vol. 726, num. 58
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ISSN: 0004-637X
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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