INTEGRAL observation of 3EG J1736-2908^*

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

Abstract

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 γ-rays with energies greater than 100 MeV.