OSSE and RXTE Observations of GRS 1915+105: Evidence for Non-thermal Comptonization
Astrophysics
2009-11-06 v2
Abstract
GRS 1915+105 was observed by the CGRO/OSSE 9 times in 1995-2000, and 8 of those observations were simultaneous with those by RXTE. We present an analysis of all of the OSSE data and of two RXTE-OSSE spectra with the lowest and highest X-ray fluxes. The OSSE data show a power-law--like spectrum extending up to ~600 keV without any break. We interpret this emission as strong evidence for the presence of non-thermal electrons in the source. The broad-band spectra cannot be described by either thermal or bulk-motion Comptonization, whereas they are well described by Comptonization in hybrid thermal/ non-thermal plasmas.
Keywords
Cite
@article{arxiv.astro-ph/0104054,
title = {OSSE and RXTE Observations of GRS 1915+105: Evidence for Non-thermal Comptonization},
author = {Andrzej A. Zdziarski and J. Eric Grove and Juri Poutanen and A. R. Rao and S. V. Vadawale},
journal= {arXiv preprint arXiv:astro-ph/0104054},
year = {2009}
}
Comments
4 pages in emulateapj5 style; Slightly modified version accepted to ApJ Letters