Issue A&A Volume 409, Number 3, October III 2003 Page(s) L35 - L39 Section Letters DOI http://dx.doi.org/10.1051/0004-6361:20031338

A&A 409, L35-L39 (2003)
DOI: 10.1051/0004-6361:20031338

Letter

Simultaneous multi-wavelength observations of GRS 1915+105

Y. Fuchs¹, J. Rodriguez^{1, 2}, I. F. Mirabel^{1, 3}, S. Chaty^{1, 4}, M. Ribó¹, V. Dhawan⁵, P. Goldoni¹, P. Sizun¹, G. G. Pooley⁶, A. A. Zdziarski⁷, D. C. Hannikainen⁸, P. Kretschmar^{9, 2}, B. Cordier¹ and N. Lund<sup>10

1</sup>  Service d'Astrophysique (CNRS FRE 2591), CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
²  Integral Science Data Center, Chemin d'Ecogia, 16, 1290 Versoix, Switzerland
³  Instituto de Astonomía y Física del Espacio / CONICET, cc67, suc 28, 1428 Buenos Aires, Argentina
⁴  Université Paris 7, Fédération APC, 2 place Jussieu, 75005 Paris, France
⁵  National Radio Astronomy Observatory, Socorro, NM 87801, USA
⁶  Mullard Radio Astronomy Observatory, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, UK
⁷  N. Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland
⁸  Observatory, PO Box 14, 00014 University of Helsinki, Finland
⁹  Max-Planck-Institut fuer Extraterrestrische Physik, Giessenbachstrasse, 85748 Garching, Germany
¹⁰  Danish Space Research Institute, Juliane Maries Vej 30, 2100 Copenhagen Oe, Denmark

(Received 4 August 2003 / Accepted 1 September 2003 )

Abstract
We present the result of multi-wavelength observations of the microquasar GRS 1915+105 in a plateau state with a luminosity of erg s ^-1 (~40% L_</I>Edd), conducted simultaneously with the INTEGRAL and RXTE satellites, the ESO/NTT, the Ryle Telescope, the NRAO VLA and VLBA, in 2003 April 2-3. For the first time were observed concurrently in GRS 1915+105 all of the following properties: a strong steady optically thick radio emission corresponding to a powerful compact jet resolved with the VLBA, bright near-IR emission, a strong QPO at 2.5 Hz in the X-rays and a power law dominated spectrum without any cutoff in the 3-400 keV range.

Key words: stars: individual: GRS 1915+105 -- X-rays: binaries -- gamma rays: observations -- ISM: jets and outflows

Offprint request: Y. Fuchs, yfuchs@cea.fr

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