State transitions in the 2001/2002 outburst of XTE J1650-500

Details State transitions in the 2001/2002 outburst of XTE J1650-500 State transitions in the 2001/2002 outburst of XTE J1650-500

2003-09-04

arxiv.org/abs/astro-ph/0309129v1

Nucl.Phys.Proc.Suppl.132:416-419,2004

Astronomy and Astrophysics

Astrophysics

4 pages, 5 figures. To appear in Proc. of the II BeppoSAX Meeting: "The Restless High-Energy Universe" (Amsterdam, May 5-8, 20

Scientific paper

10.1016/j.nuclphysbps.2004.04.07

We present a study of the X-ray transient and black hole candidate XTE J1650-500 during its 2001/2002 outburst. The source made two state transitions between the hard and soft states, at luminosity levels that differed by a factor of ~5-10. The first transition, between hard and soft, lasted for ~30 days and showed two parts; one part in which the spectral properties evolve smoothly away from the hard state and another that we identify as the 'steep power law state'. The two parts showed different behavior of the Fe K emission line and QPO frequencies. The second transition, from soft to hard, lasted only \~15 days and showed no evidence of the presence of the 'steep power law state'. Comparing observations from the early rise and the decay of the outburst, we conclude that the source can be in the hard state in a range of more 10^4 in luminosity. We briefly discuss the state transitions in the framework of a two-flow model.

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