Observation of VHE gamma-ray emission from the Active Galactic Nucleus 1ES1959+650 using the MAGIC telecope

Abstract

The MAGIC Cherenkov telescope has observed very high energy (VHE) gamma-ray emission from the Active Galactic Nucleus 1ES1959+650 during six hours in September and October 2004. The observations were carried out alternated with the Crab Nebula, whose data were used as reference source for optimizing gamma/hadron separation and for flux comparison. The data analysis shows VHE gamma-ray emission of 1ES1959+650 with ~ 8 sigma significance, at a time of low activity in both optical and X-ray wavelengths. An integral flux above ~ 180 GeV of about 20% of the Crab 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.

16 pages, 6 figures

Cited by in corpus (39)

• The Spectral Energy Distribution of Fermi bright blazars
• Semi-analytic modeling of the EBL and consequences for extragalactic gamma-ray spectra
• The power of blazar jets
• The Extragalactic Background Light and the Gamma-ray Opacity of the Universe
• Indications for a pair-production anomaly from the propagation of VHE gamma-rays
• Role of line-of-sight cosmic ray interactions in forming the spectra of distant blazars in TeV gamma rays and high-energy neutrinos
• Detection of VHE gamma-ray emission from the distant blazar 1ES 1101-232 with H.E.S.S. and broadband characterisation
• Long-term optical monitoring of TeV emitting Blazars
• Blazar Gamma-Rays, Shock Acceleration, and the Extragalactic Background Light
• Discovery of very high energy gamma-ray emission from the low-frequency peaked BL Lacertae object BL Lacertae
• Discovery of Very High Energy $\gamma$-Rays from Markarian~180 Triggered by an Optical Outburst
• Simultaneous multiwavelength observations of the blazar 1ES1959+650 at a low TeV flux
• The Parsec-Scale Jets of the TeV Blazars H 1426+428, 1ES 1959+650, and PKS 2155-304: 2001-2004
• Observation of very high energy gamma-rays from the AGN 1ES 2344+514 in a low emission state with the MAGIC telescope
• Spectrum and Anisotropy of Cosmic Rays at TeV-PeV-energies and Contribution of Nearby Sources
• Quasi-simultaneous two band optical variability of the blazars 1ES 1959+650 and 1ES 2344+514
• Synoptic studies of seventeen blazars detected in very high-energy gamma-rays
• Observation of VHE Gamma Radiation from HESS J1834-087/W41 with the MAGIC Telescope
• First-Epoch VLBA Imaging of Twenty New TeV Blazars
• Broadband characterisation of the very intense TeV flares of the blazar 1ES 1959+650 in 2016
• Blazar halos as probe for extragalactic magnetic fields and maximal acceleration energy
• Baryon Loading Efficiency and Particle Acceleration Efficiency of Relativistic Jets: Cases For Low Luminosity BL Lacs
• Importance of axion-like particles for very-high-energy astrophysics
• Systematic search for VHE gamma-ray emission from X-ray bright high-frequency BL Lac objects
• Broadband study of blazar 1ES 1959+650 during flaring state in 2016
• Multiwavelength Observations of 1ES 1959+650, One Year After the Strong Outburst of 2002
• Prospects for Very High Energy Blazar Survey by the Next Generation Cherenkov Telescopes
• Intergalactic absorption and blazar gamma-ray spectra
• Galactic and Extragalactic Sources of Very High Energy Gamma-rays
• A two-zone photohadronic interpretation of the EHBL-like behavior of the 2016 multi-TeV flares of 1ES 1959+650
• Lower Bound on the Cosmic TeV Gamma-ray Background Radiation
• Observations of Extragalactic Sources with the MAGIC Telescope
• High-(Energy)-Lights -- The Very High Energy Gamma-Ray Sky
• Propagation of very-high-energy $\gamma$-rays from distant blazars
• VHE $\gamma$-ray observations of bright BL Lacs with the Large-Sized Telescope prototype (LST-1) of the CTAO
• Insights into the Long-term behavior of the optical polarization from the blazar 1ES 1959+650
• Mass-Radius Constraints for 2S 0918-549 from an RXTE Superexpansion Burst: A Direct Cooling-Tail Analysis
• Multiwavelength spectral and temporal analysis of VHE Blazar 1ES 1959+650: Tracing emission mechanisms across flux states
• Revisiting the evidences for spectral anomalies in distant blazars: new data on the photon-ALP mixing