Comptonization and reflection of X-ray radiation and the X-ray-radio correlation in the χ-states of GRS 1915+105*
Astrophysical Institute Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
2 Max-Planck-Institute for extraterrestrial Physics, Giessenbachstrasse, 85748 Garching, Germany
Corresponding author: A. Rau, firstname.lastname@example.org
Accepted: 31 May 2002
We present a comprehensive X-ray study of four years of pointed RXTE observations of GRS 1915+105 in the χ-state. We interpret the behavior of the hard power law tail spectrum as coming from inverse Compton scattering of soft disk photons on a thermally dominated hybrid corona above the accretion disk. GRS 1915+105 shows a strong, variable reflection amplitude. As in other BHC and in Seyfert galaxies, a correlation between the power law slope and the reflection was found. Also, the radio fluxes at 2.25 GHz and 15 GHz correlate with the power law slope, thus revealing a connection between the outflowing matter and the comptonizing region in the χ-states.
Key words: X-rays: stars / stars: binaries: close / X-rays: individual: GRS 1915+105
© ESO, 2003