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Observation of very high energy gamma-ray emission from the active galactic nucleus 1ES 1959+650 using the MAGIC telescope

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Antoranz Canales, Pedro and Barrio Uña, Juan Abel and Contreras González, José Luis and Fonseca González, Mª Victoria and López Moya, Marcos and Miranda Pantoja, José Miguel (2006) Observation of very high energy gamma-ray emission from the active galactic nucleus 1ES 1959+650 using the MAGIC telescope. Astrophysical journal, 639 (2 (Par). pp. 761-765. ISSN 0004-637X

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Official URL: http://dx.doi.org/10.1086/499421




Abstract

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.


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© The American Astronomical Society. We would like to thank the IAC for the excellent working conditions on the La Palma Observatory Roque de los Muchachos. We are grateful to the RXTEASMteam for their quick-look results. The support of the German BMBF and MPG, the Italian INFN, and the Spanish CICYT is gratefully acknowledged. This work was also supported by ETH research grant TH-34/04-3 and Polish grant MNiI 1P03D01028.

Uncontrolled Keywords:TEV Blazar 1ES-1959+650, Radio-Sources, Acceleration, Sensitivity, Neutrinos, Spectra, Objects.
Subjects:Sciences > Physics > Electronics
Sciences > Physics > Electricity
Sciences > Physics > Nuclear physics
ID Code:24244
Deposited On:20 Jan 2014 13:20
Last Modified:10 Dec 2018 14:58

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