EDP Sciences
Free access
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. Rodriguez1, 2, I. F. Mirabel1, 3, S. Chaty1, 4, M. Ribó1, V. Dhawan5, P. Goldoni1, P. Sizun1, G. G. Pooley6, A. A. Zdziarski7, D. C. Hannikainen8, P. Kretschmar9, 2, B. Cordier1 and N. Lund10

1  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 ${\sim}7.5\times10^{38}$ 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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