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

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

2007-04-05

arxiv.org/abs/0704.0734v1

Astronomy and Astrophysics

Astrophysics

2 pages, 1 figure, Conference proceedings to appear in "The Central Engine of Active Galactic Nuclei", ed. L. C. Ho and J.-M.

Scientific paper

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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