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.

J., A., E., A., H., A., P., A., A., A., M., A., et al. (2006). Observation of very high energy gamma-ray emission from the active galactic nucleus 1ES 1959+650 using the magic telescope. THE ASTROPHYSICAL JOURNAL, 639(2), 761-765 [10.1086/499421].

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

PAOLETTI, RICCARDO;STAMERRA, ANTONIO;
2006-01-01

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.
2006
J., A., E., A., H., A., P., A., A., A., M., A., et al. (2006). Observation of very high energy gamma-ray emission from the active galactic nucleus 1ES 1959+650 using the magic telescope. THE ASTROPHYSICAL JOURNAL, 639(2), 761-765 [10.1086/499421].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/39303
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