2026-04-17T02:39:11Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1228122025-12-05T16:40:27Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

00925njm 22002777a 4500 dc Paredes i Poy, Josep Maria author Bordas Coma, Pol author Bosch i Ramon, Valentí author Ribó Gomis, Marc author Cañellas, A. author Moldón Vara, Francisco Javier author Zabalza de Torres, Víctor author 2018-06-06T14:08:15Z 2018-06-06T14:08:15Z 2011-01-10 2018-06-06T14:08:16Z 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. Galàxies actives Raigs gamma Active galaxies Gamma rays Observations of the blazar 3C 66A with the magic telescopes in stereoscopic mode