Investigating the EGRET-radio galaxies link with INTEGRAL: the case of 3EG J1621+8203 and NGC 6251

Abstract

The analysis of an INTEGRAL AO2 observation of the error contours of the EGRET source 3EG J1621+8203 is presented. The only source found inside the error contours for energies between 20 and 30 keV at 5 sigma detection significance is the FR I radio galaxy NGC 6251. This supports the identification of NGC 6251 with 3EG J1621+8203. The observed flux is higher and softer than observed in the past, but consistent with a variable blazar-like spectral energy distribution.

arXiv comment5 pages, 2 figures. Accepted for publication on A&A Main Journal

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• Bright AGN Source List from the First Three Months of the Fermi Large Area Telescope All-Sky Survey
• Fermi Large Area Telescope Observations of Misaligned AGN
• SuperAGILE: the hard X-ray Imager for the AGILE space mission
• A revised catalogue of EGRET gamma-ray sources
• Is the core of M87 the source of its TeV emission? Implications for unified schemes
• XMM-Newton observations of a sample of gamma-ray loud active galactic nuclei
• Suzaku Observations of gamma-Ray Bright Radio Galaxies: Origin of the X-ray Emission and Broad-Band Modelin
• Implications for the structure of the relativistic jet from multiwavelength observations of NGC 6251
• Astrophysics in 2005
• Hunting for the nature of the enigmatic narrow-line Seyfert 1 galaxy PKS 2004-447