GRO J1655-40: from ASCA and XMM-Newton Observations
Abstract
We have analysed four ASCA observations (1994--1995, 1996--1997) and three XMM-Newton observations (2005) of this source, in all of which the source is in high/soft state. We modeled the continuum spectra with relativistic disk model kerrbb, estimated the spin of the central black hole, and constrained the spectral hardening factor fcol and the distance. If kerrbb model applies, for normally used value of fcol, the distance cannot be very small, and fcol changes with observations.
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