Obst, MariaPottschmidt, KatjaLohfink, A.Wilms, J.Bel, M. CadolleSmith, D. M.Tomsick, J. A.Kreykenbohm, I.Rodrigues, B. H.2023-09-142023-09-14http://hdl.handle.net/11603/29670We 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.1 pageen-USThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.Text