Simultaneous XMM-Newton - RXTE observations of 1E1740.7-2942

It has been known that sources that have high absorption column density (NH)also have high dust column density along the line of sight. The differentialdelays caused by small angle scattering from dust may have important effects onthe power spectra of Galactic black holes (GBHs) at low energies, and impactstudies that use the relation between the rms amplitude of variability andenergy to determine the origin of QPOs from these sources. We propose to observehigh NH (1E23 cm2) GBH 1E1740.72942 for 20 ks simultaneously with XMMNewtonand RXTE. By comparing the power spectra from the PSF in XMMNewton (usingimaging and excluding the scattering halo) and the RXTE data, we willinvestigate the effects of small angle scattering on the timing properties of GBHs. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]