Volume 391, Number 3, September I 2002
|Page(s)||993 - 997|
|Section||Interstellar and circumstellar matter|
|Published online||09 August 2002|
XMM-Newton detection of Nova Muscae 1991 in quiescence
The Open University, Milton Keynes, UK
2 University of Southampton, UK
3 X-ray Astronomy Group, Dept of Physics and Astronomy, University of Leicester, University Rd, Leicester LE1 7RH, UK
4 SRON, Utrecht, The Netherlands
5 IAC, La Laguna, Tenerife, Spain
6 Institute of Astronomy and Astrophysics, National Observatory of Athens, PO Box 20048, Athens 11810, Greece
7 Dept. of Astrophysics, Oxford University, UK
8 NASA/GSFC, Maryland, USA
Corresponding author: F. K. Sutaria, F.K.Sutaria@open.ac.uk
Accepted: 4 June 2002
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.
Key words: X-rays: binaries / X-rays: individuals: GU Mus / black hole physics / accretion, accretion disks
© ESO, 2002
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