SIMBAD references

2001MNRAS.325.1253G - Mon. Not. R. Astron. Soc., 325, 1253-1265 (2001/August-2)

Application of a relativistic accretion disc model to X-ray spectra of LMC X-1 and GRO J1655-40.

GIERLINSKI M., MACIOLEK-NIEDZWIECKI A. and EBISAWA K.

Abstract (from CDS):

We present a general relativistic accretion disc model and its application to the soft-state X-ray spectra of black hole binaries. The model assumes a flat, optically thick disc around a rotating Kerr black hole. The disc locally radiates away the dissipated energy as a blackbody. Special and general relativistic effects influencing photons emitted by the disc are taken into account. The emerging spectrum, as seen by a distant observer, is parametrized by the black hole mass and spin, the accretion rate, the disc inclination angle and the inner disc radius.

We fit the ASCA soft-state X-ray spectra of LMC X-1 and GRO J1655-40 by this model. We find that, having additional limits on the black hole mass and inclination angle from optical/UV observations, we can constrain the black hole spin from X-ray data. In LMC X-1 the constraint is weak, and we can only rule out the maximally rotating black hole. In GRO J1655-40 we can limit the spin much better, and we find 0.68≤a≤0.88. Accretion discs in both sources are radiation-pressure dominated. We do not find Compton reflection features in the spectra of any of these objects.


Abstract Copyright: The Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - relativity - stars: individual: GRO J1655-40 - stars: individual: LMC X-1 - X-rays: stars

Simbad objects: 6

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2001MNRAS.325.1253G and select 'bookmark this link' or equivalent in the popup menu