EDP Sciences
Free access
Volume 433, Number 2, April II 2005
Page(s) 515 - 518
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20042353

A&A 433, 515-518 (2005)
DOI: 10.1051/0004-6361:20042353

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

L. Foschini1, M. Chiaberge2, P. Grandi1, I. A. Grenier3, 4, M. Guainazzi5, W. Hermsen6, 7, G. G. C. Palumbo8, J. Rodriguez4, 9, S. Chaty3, 4, S. Corbel3, 4, G. Di Cocco1, L. Kuiper6 and G. Malaguti1

1  Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF) del CNR/INAF, Sezione di Bologna, via Gobetti 101, 40129 Bologna, Italy
    e-mail: foschini@bo.iasf.cnr.it
2  Istituto di Radioastronomia (IRA) del CNR/INAF, via Gobetti 101, 40129 Bologna, Italy
3  Université Paris VII Denis-Diderot, 2 place Jussieu, 75251 Paris Cedex 05, France
4  CEA Saclay, DSM/DAPNIA/SAp (CNRS FRE 2591), 91191 Gif-sur-Yvette Cedex, France
5  XMM-Newton SOC - European Space Astronomy Center of ESA, Vilspa, Apartado 50727, 28080 Madrid, Spain
6  SRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
7  Astronomical Institute "Anton Pannekoek", University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
8  Dipartimento di Astronomia, Università di Bologna, via Ranzani 1, 40127 Bologna, Italy
9  INTEGRAL Science Data Centre, Chemin d'Écogia 16, Versoix, Switzerland

(Received 10 November 2004 / Accepted 6 December 2004)

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.

Key words: X-rays: galaxies -- galaxies: active -- galaxies: individual: NGC 6251

SIMBAD Objects

© ESO 2005