EDP Sciences
Free access
Volume 425, Number 1, October I 2004
Page(s) 89 - 93
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20040484

A&A 425, 89-93 (2004)
DOI: 10.1051/0004-6361:20040484

INTEGRAL observation of 3EG J1736-2908

G. Di Cocco1, L. Foschini1, P. Grandi1, G. Malaguti1, A. J. Castro-Tirado2, S. Chaty3, 4, A. J. Dean5, N. Gehrels6, I. Grenier3, 4, W. Hermsen7, L. Kuiper7, N. Lund8 and F. Mirabel3

1  Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF) del CNR - Sezione di Bologna, via Gobetti 101, 40129 Bologna, Italy
    e-mail: dicocco@bo.iasf.cnr.it
2  Instituto de Astrofísica de Andalucía (IAA-CSIC), PO Box 03004, 18080 Granada, Spain
3  CEA Saclay, DSM/DAPNIA/SAp (CNRS FRE 2591) 91191 Gif-sur-Yvette Cedex, France
4  Université Paris 7 Denis-Diderot 2 place Jussieu 75251 Paris Cedex 05, France
5  Department of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK
6  NASA Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Code 661, Greenbelt, MD, USA
7  SRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
8  Danish Space Research Institute, Juliane Maries Vej 30, 2100 Copenhagen, Denmark

(Received 19 March 2004 / Accepted 4 June 2004)

The possible identification by INTEGRAL of the EGRET source 3EG J1736-2908 with the active galactic nucleus GRS 1734-292 is discussed. The latter was discovered in 1990 and later identified with a Seyfert 1 galaxy. At the time of the compilation of the 3rd EGRET Catalog, it was not considered as a possible counterpart of the source 3EG J1736-2908, which remained unidentified. A detailed multiwavelength study of the EGRET error circle is presented, by including archival radio, soft- and hard-X observations, suggesting that GRS1734-292 could be a likely counterpart of 3EG J1736-2908, even though this poses very interesting questions about the production mechanisms of $\gamma$-rays with energies greater than 100 MeV.

Key words: gamma-rays: observations -- X-rays: galaxies -- galaxies: active -- galaxies: individual: GRS1734-292

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