GRS 1758-258: Shedding Light on the Stability and Spectral Variability of the Hard State of Black Holes

Details GRS 1758-258: Shedding Light on the Stability and Spectral Variability of the Hard State of Black Holes GRS 1758-258: Shedding Light on the Stability and Spectral Variability of the Hard State of Black Holes

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.1101l&link_type=abstract

American Astronomical Society, HEAD meeting #11, #11.01; Bulletin of the American Astronomical Society, Vol. 41, p.671

Physics

Scientific paper

The microquasar GRS 1758-258 is one of only three persistent black hole binaries that spend most of their time in the hard spectral state. We present an analysis of extensive monitoring observations recently obtained by INTEGRAL. In particular we report on the discovery of the onset of a development towards a dim soft state in fall 2007 and on the variability of the spectrum in the hard state. The latter, especially the parameter range of the curvature of the hard spectral component, is still not well known for this source class, as it is difficult to measure with high accuracy for transient sources, but it is important to know in order to understand the physics of the hot plasma of the jet base and/or the corona. We present long term light curves from two Galactic Center viewing epochs with INTEGRAL each year over several years. Moreover we discuss the evolution of the spectral parameters with Comptonization models obtained from modeling the averaged INTEGRAL spectra, also including a few snapshots with Swift. We search for non-thermal emission and compare the spectral variability of GRS 1758-258 with that of the prototype hard state source Cyg X-1. In addition we discuss the behavior on shorter timescales using hardness-intensity diagrams.

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