XMM-Newton detection of Nova Muscae 1991 in Quiescence

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 $\simeq 1.1\times 10^{-14}$ ergs cm${}^{-2}$ s${}^{-1}$. The spectra is well fit by an absorbed powerlaw with a photon index of $\alpha =1.6\pm 0.4$, 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.

6 pages including 3 figures. Accepted for publication, Astronomy and Astrophysics

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