2001MNRAS.325.1253G

Query : 2001MNRAS.325.1253G

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

Number of rows : 6
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 X LMC X-3 HXB 05 38 56.6323605504 -64 05 03.317937504   17 17.2     B2.5Ve 722 0
2 X LMC X-1 HXB 05 39 38.8284304464 -69 44 35.531553624   14.8 14.5 14.924   O8(f)p 700 0
3 V* GU Mus HXB 11 26 26.5961559600 -68 40 32.877752952           K3V-K7V 734 1
4 V* V1033 Sco HXB 16 54 00.1423963019 -39 50 44.761701340       16.14   F3-6IV 1980 0
5 V* V821 Ara LXB 17 02 49.3876391280 -48 47 23.087954544         15.322 ~ 2237 0
6 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4590 0

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