GRO J1655-40: from ASCA and XMM-Newton Observations

2007/04/05 by Zhang, Xiao-Ling, Zhang, Shuang Nan, Sala, Gloria +3
#Astrophysics (astro-ph) #FOS: Physical sciences

paper · doi:10.48550/arxiv.0704.0734

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 f_col and the distance. If kerrbb model applies, for normally used value of f_col, the distance cannot be very small, and f_col changes with observations.

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