A Transition to the Soft State in GRS 1758-258

Details A Transition to the Soft State in GRS 1758-258 A Transition to the Soft State in GRS 1758-258

2001-03-22

arxiv.org/abs/astro-ph/0103381v3

Astronomy and Astrophysics

Astrophysics

13 pages, 5 figures, accepted for publication in The Astrophysical Journal Letters Accepted version has only minor changes, pl

Scientific paper

10.1086/320928

Near the end of 2001 February, the black-hole candidate (BHC) GRS 1758-258 made an abrupt transition from a standard hard (low) state to a soft state. Unlike Cyg X-1 and other BHCs, whose luminosity increases during this transition, GRS 1758-258 was dimmer after the transition. We present observations with the Proportional Counter Array on the Rossi X-ray Timing Explorer and interpret the phenomenon in the context of a ``dynamical'' soft state model. Using this model we predicted that mass transfer from the companion had ceased, and that the luminosity should decay on a timescale of a few weeks. The most recent data support this prediction, being consistent with a decay time of 34 dy. The current state is consistent with the ``off'' state of GRS 1758-258 reported by GRANAT/Sigma in 1991-1992.

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