XMM-Newton Observation of the Black Hole Microquasar GRS 1758-258

Details XMM-Newton Observation of the Black Hole Microquasar GRS 1758-258 XMM-Newton Observation of the Black Hole Microquasar GRS 1758-258

2001-06-18

arxiv.org/abs/astro-ph/0106310v1

Astronomy and Astrophysics

Astrophysics

To appear in the Proc. of the Gamma-Ray Astrophysics 2001 Symposium, 4-6 April 2001, Baltimore, Maryland, U.S.A.. American Ins

Scientific paper

10.1063/1.1419372

The XMM-Newton X-ray observatory pointed the galactic black hole candidate and microquasar GRS 1758-258 in September 2000 for about 10 ks during a program devoted to the scan of the Galactic Center regions. Preliminary results from EPIC MOS camera data are presented here. The data indicate that the source underwent a state transition from its standard low-hard state to an intermediate state. For the first time in this source the ultra-soft component of the accretion disk, which black hole binaries display in intermediate or high-soft states, was clearly detected and measured thanks to the high spectral capabilities of XMM-Newton.

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