The high-energy picture of GRS 1915+105 with SPI/INTEGRAL

Details The high-energy picture of GRS 1915+105 with SPI/INTEGRAL The high-energy picture of GRS 1915+105 with SPI/INTEGRAL

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sf2a.conf..203d&link_type=abstract

"SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes

Astronomy and Astrophysics

Astrophysics

Scientific paper

We report the results of two years of INTEGRAL/SPI monitoring of the Galactic microquasar GRS 1915+105. From July 2004 to May 2006, the source has been observed twenty times with long (˜ 100 ks) exposures. We present an analysis of the SPI data and focus on the description of the high-energy (> 20 keV) output of the source. We find the 20-500 keV spectral emission of GRS 1915+105 to be bounded between two limit states. In particular, it seems that these high-energy states are not correlated to the temporal behavior of the source, suggesting that there is no immediate link between the macroscopic characteristics of the coronal plasma and the the variability of the accretion flows. All spectra are well fitted by a thermal comptonization component plus an extra high-energy powerlaw. This confirms the presence of thermal and non-thermal electrons around the black hole.

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