OSSE and [ITAL]RXTE[/ITAL] Observations of GRS 1915+105: Evidence for Nonthermal Comptonization
The Astrophysical Journal2001Vol. 554(1), pp. L45–L48
Citations Over TimeTop 10% of 2001 papers
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.
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