Simultaneous multi-wavelength observations of GRS 1915+105
Goldoni, P.; Chaty, S.; Rodriguez, J.; Cordier, B.; Fuchs, Y.; Mirabel, I. F.; Kretschmar, P.; Lund, N.; Pooley, G. G.; Ribó, M.; Zdziarski, A. A.; Sizun, P.; Hannikainen, D. C.; Dhawan, V.
France, Switzerland, Argentina, United States, United Kingdom, Poland, Finland, Germany, Denmark
Abstract
We present the result of multi-wavelength observations of the microquasar GRS 1915+105 in a plateau state with a luminosity of ~ 7.5*E38 erg s-1 ( ~ 40% L_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.
Based on observations with INTEGRAL, an ESA project with instruments and science data centre 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. Based on observations collected at the European Southern Observatory, Chile (ESO N° 071.D-0073). The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.