MAGIC upper limits to the VHE gamma-ray flux of 3C454.3 in high emission state

Abstract

We report upper limits to the very high energy flux (E>100 GeV) of the flat spectrum radio quasar 3C454.3 (z=0.859) derived by the Cherenkov telescope MAGIC during the high states of July/August and November/December 2007. We compare the upper limits derived in both time slots with the available quasi-simultaneous MeV-GeV data from the AGILE gamma-ray satellite and interpret the observational results in the context of leptonic emission models. The source was observed with the MAGIC telescope during the active phases of July-August 2007 and November-December 2007 and the data were analyzed with the MAGIC standard analysis tools. For the periods around the ends of July and November, characterized by the most complete multifrequency coverage, we constructed the spectral energy distributions using our data together with nearly simultaneous multifrequency (optical, UV, X-ray and GeV) data. Only upper limits can be derived from the MAGIC data. The upper limits, once corrected for the expected absorption by the extragalactic background light, together with nearly simultaneous multifrequency data, allow us to constrain the spectral energy distribution of 3C454.3. The data are consistent with the model expectations based on the inverse Compton scattering of the ambient photons from the broad line region by relativistic electrons, which robustly predicts a sharp cut-off above 20-30 GeV.

arXiv comment5 pages, 1 figure, submitted to A&A

References in corpus (32)

• The extragalactic optical-infrared background radiations, their time evolution and the cosmic photon-photon opacity
• Limits and Confidence Intervals in the Presence of Nuisance Parameters
• A low level of extragalactic background light as revealed by gamma-rays from blazars
• Very-High-Energy Gamma Rays from a Distant Quasar: How Transparent Is the Universe?
• The AGILE Mission
• Fast variability of TeV gamma-rays from the radio galaxy M 87
• Implications of Cosmological Gamma-Ray Absorption II. Modification of gamma-ray spectra
• VHE Gamma-Ray Observation of the Crab Nebula and its Pulsar with the MAGIC telescope
• The Jet-Disk Connection and Blazar Unification
• Implementation of the Random Forest Method for the Imaging Atmospheric Cherenkov Telescope MAGIC
• Klein-Nishina Effects in the Spectra of Non-Thermal Sources Immersed in External Radiation Fields
• New limits on the density of the extragalactic background light in the optical to the far-infrared from the spectra of all known TeV blazars
• The unprecedented optical outburst of the quasar 3C 454.3. The WEBT campaign of 2004-2005
• Is the Giant Radio Galaxy M87 a TeV Gamma-Ray Emitter?
• Absorption of 10--200 Gev Gamma Rays by Radiation from BLR in Blazars
• Formation of hard VHE gamma-ray spectra of blazars due to internal photon-photon absorption
• The spectrum of the Broad Line Region and the high-energy emission of powerful blazars
• Discovery of very high energy gamma-ray emission from the low-frequency peaked BL Lacertae object BL Lacertae
• Swift and infra-red observations of the blazar 3C~454.3 during the giant X-ray flare of May 2005
• VERITAS Discovery of >200GeV Gamma-ray Emission from the Intermediate-frequency-peaked BL Lac Object W Comae
• On the Nature of MeV-blazars
• Multiwavelength observations of 3C 454.3. I. The AGILE 2007 November campaign on the "Crazy Diamond"
• AGILE detection of a strong gamma-ray flare from the blazar 3C 454.3
• The redshift-dependence of gamma-ray absorption in the environments of strong-line AGN
• INTEGRAL observations of the blazar 3C454.3 in outburst
• Chandra and HST observations of gamma-ray blazars: comparing jet emission at small and large scales
• Intrinsic absorption in 3C 279 at GeV-TeV energies and consequences for estimates of the EBL
• Discovery of a very high energy gamma-ray signal from the 3C 66A/B region
• On the July 2007 flare of the blazar 3C 454.3
• Modification of the gamma-ray spectra by internal absorption in OVV blazars: The example cases of 3C 273 and 3C 279
• Absorption of 10 Gev--1 Tev Gamma Rays by Radiation from Broad-Line Region in 3C 279
• FCNC-induced semileptonic decays of $J/\psi$ in the Standard Model

Cited by in corpus (16)

• Early Fermi Gamma-ray Space Telescope Observations of the Quasar 3C 454.3
• Characterizing the Gamma-Ray Variability of the Brightest Flat Spectrum Radio Quasars Observed with the Fermi LAT
• Multiwavelength observations of 3C 454.3. III. Eighteen months of AGILE monitoring of the "Crazy Diamond"
• The long-lasting activity of 3C 454.3. GASP-WEBT and satellite observations in 2008-2010
• Simultaneous Multiwavelength Observations of Markarian 421 During Outburst
• The core shift effect in the blazar 3C 454.3
• Multiwavelength observations of 3C 454.3 II. The AGILE 2007 December campaign
• The Nature of gamma-ray Loud Narrow Line Seyfert I Galaxies PKS 1502+036 and PKS 2004-447
• Clues on High Energy Emission Mechanism from Blazar 3C 454.3 during 2015 August Flare
• Absorption of 10 Gev--1 Tev Gamma Rays from 3C 279
• Blazar 3C 454.3 in Outburst and Quiescence During 2005-2007: Two Variable Synchrotron Emission Peaks
• Modeling the spectral-energy-distribution of 3C 454.3 in a "flat" broad-line-region scenario
• Identifying the brightest Galactic globular clusters for future observations by H.E.S.S. and CTA
• Assessing Uncertainties in the Predicted Very-High-Energy Flux of Globular Clusters in the Cherenkov Telescope Array Era
• Constraints on VHE gamma-ray emission of Flat Spectrum Radio Quasars with the MAGIC telescopes
• Extreme Transients in Gamma Rays