Evolution of the optically thick disk in Nova Muscae

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Novae, Dwarf Novae, Recurrent Novae, And Other Cataclysmic Variables, Black Holes, Accretion And Accretion Disks, Luminosities, Magnitudes, Effective Temperatures, Colors, And Spectral Classification, Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

We here model the soft X-ray flux from the black hole X-ray nova, GS 1124-68 (Nova Muscae, GRS 1124-68) as emission from an optically-thick accretion disk with Comptonization. We demonstrate that examining the disk's radial dependence on the accretion rate separately in the various spectral states allows for a variation in the location of the disk's inner edge. By extension, we infer the presence of a hot inner region, which can account for the hard component and thus produce a consistency with currently viable models. Our results suggest that the disk's inner edge has a radius whose dependence on the accretion rate is a power-law, and that the slope of this function changes between the different spectral states. We show, moreover, that the accretion rate does not appear to be a direct measure of the total luminosity. This implies that a certain fraction of the released gravitational energy is probably advected inwards-through the event horizon.

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