GRS 1758-258: A rare persistent hard state Black Hole

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https://articles.adsabs.harvard.edu/pdf/2013HEAD...1312654O

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
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https://orcid.org/0000-0002-4656-6881

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Abstract

We present the spectral and timing evolution of GRS 1758-258, one of only three known persistent black hole binaries in our Galaxy, based on 11 years of RXTE-PCA observations. During this time, GRS 1758-258 entered a thermally dominated soft state seven times, showing a strong decline in the 3-20 keV flux rather than an increase. There is only one other source that displays this behavior. In its hardness intensity diagram below 20 keV, GRS 1758-258 shows a hysteresis of hard and soft state fluxes like transient sources in outburst, but with deviations from their typical q-tracks. The spectral flux light curve does not contain any orbital modulations in the range of 1 to 30 days, but in the dynamic power spectrum significant peaks are drifting between 18.47 ± 0.25 and 18.04 ± 0.22 days.