2026-06-27T23:16:06Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/509352024-09-05T17:46:00Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Antoranz Canales, Pedro author Barrio Uña, Juan Abel author Contreras González, José Luis author Fonseca González, María Victoria author López Moya, Marcos author Miranda Pantoja, José Miguel author 2006-03-10 The MAGIC Cerenkov telescope has observed very high energy (VHE) gamma-ray emission from the active galactic nucleus 1ES 1959+650 during 6 hr in 2004 September and October. The observations were carried out alternating with observations of the Crab Nebula, whose data were used as a reference source for optimizing gamma -ray/hadron separation and for flux comparison. The data analysis shows VHE gamma-ray emission of 1ES 1959+650 with similar to 8 sigma significance, at a time of low activity in both optical and X-ray wavelengths. An integral flux above similar to 180 GeV of about 20% that of the Crab Nebula was obtained. The light curve, sampled over 7 days, shows no significant variations. The differential energy spectrum between 180 GeV and 2 TeV can be fitted with a power-law of index -2.72 +/- 0.14. The spectrum is consistent with the slightly steeper spectrum seen by HEGRA at higher energies, also during periods of low X-ray activity. 0004-637X 10.1086/499421 https://hdl.handle.net/20.500.14352/50935 http://dx.doi.org/10.1086/499421 http://iopscience.iop.org http://arxiv.org/abs/astro-ph/0508543 Observation of very high energy gamma-ray emission from the active galactic nucleus 1ES 1959+650 using the MAGIC telescope