XMM-Newton detection of Nova Muscae 1991 in quiescence

Firoza Sutaria, U. Kolb, P. A. Charles, J. P. Osborne, E. Kuulkers, J. Casares, E. T. Harlaftis, T. Shahbaz, M. Still, P. J. Wheatley

Abstract

The soft X-ray transient GU Mus has been detected by XMM-Newton in the quiescent state. The source is very faint, with a 0.5–10.0 keV unabsorbed flux of ergs cm-2 s-1. The spectra is well fit by an absorbed powerlaw with a photon index of , close to the value seen when the source was in the low/hard state in Aug. 1991. From our observed luminosity, it seems unlikely that the quiescent state emission is dominated by coronal X-rays from the secondary. The flux also appears to be in agreement with the ADAF model of BH-transients in quiescence.

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