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

L. Foschini; M. Chiaberge; P. Grandi; I. A. Grenier; M. Guainazzi; W. Hermsen; G. G. C. Palumbo; J. Rodriguez; S. Chaty; S. Corbel; G. Di Cocco; L. Kuiper; G. Malaguti

doi:10.1051/0004-6361:20042353

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Volume 433 / No 2 (April II 2005)

A&A, 433 2 (2005) 515-518

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Issue		A&A Volume 433, Number 2, April II 2005


Page(s)		515 - 518
Section		Extragalactic astronomy
DOI		https://doi.org/10.1051/0004-6361:20042353
Published online		22 March 2005

A&A 433, 515-518 (2005)

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

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.

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

^*

Based on observations with INTEGRAL, an ESA mission with instruments and science data center funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, Spain), Czech Republic and Poland, and with the participation of Russia and the USA.

© ESO, 2005

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

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