Hard X-ray emission of the microquasar GRO J1655-40 during the rise of its 2005 outburst

Abstract

We present the analysis of the high energy emission of the Galactic black hole GRO J1655-40 at the beginning of its 2005 outburst. The data from 458 ks of INTEGRAL observations, spread over 4 weeks, are analyzed, along with the existing simultaneous RXTE and Swift data. The high energy data allow us to detect the presence of a high energy cut-off and to study its evolution during the outburst rise. This high energy feature is generally related to thermal mechanisms in the framework of Comptonization models from which we can estimate the plasma parameters. We found an electron temperature of about 30-40 keV and an optical depth around 1.8-2.1. The high energy cut-off decreased along with the radio flux, and disappeared as the jet turned off.

24 pages, 5 figures, accepted for publication in the Astrophsical Journal

References in corpus (5)

• X-ray Properties of Black-Hole Binaries
• XMM-Newton and INTEGRAL spectroscopy of the microquasar GRO J1655-40 during its 2005 outburst
• GRO J1655-40: Early Stages of the 2005 Outburst
• On the distance of GRO J1655-40
• The high energy emission of GRO J1655-40 as revealed with INTEGRAL spectroscopy of the 2005 outburst

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