2006ApJ...636L.113S

Query : 2006ApJ...636L.113S

2006ApJ...636L.113S - Astrophys. J., 636, L113-L116 (2006/January-2)

Estimating the spin of stellar-mass black holes by spectral fitting of the X-ray continuum.

SHAFEE R., McCLINTOCK J.E., NARAYAN R., DAVIS S.W., LI L.-X. and REMILLARD R.A.

Abstract (from CDS):

We fit X-ray spectral data in the thermal-dominant, or high-soft, state of two dynamically confirmed black holes, GRO J1655-40 and 4U 1543-47, and estimate the dimensionless spin parameters a*≡a/M of the two holes. For GRO J1655-40, using a spectral hardening factor computed for a non-LTE relativistic accretion disk, we estimate a*∼0.75 and a*∼0.65-0.75, respectively, from ASCA and RXTE data. For 4U 1543-47, we estimate a*∼ 0.75-0.85 from RXTE data. Thus, neither black hole has a spin approaching the theoretical maximum a*=1.

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Journal keyword(s): Accretion, Accretion Disks - Stars: Binaries: Close - Black Hole Physics - Stars: Individual: Alphanumeric: 4U 1543-47 - Stars: Individual: Alphanumeric: GRO J1655-40 - X-Rays: Stars

Simbad objects: 5

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Number of rows : 5
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 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
2 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5476 0
3 V* IL Lup HXB 15 47 08.2768672752 -47 40 10.284587760         15.624 ~ 532 1
4 V* V381 Nor HXB 15 50 58.6637920704 -56 28 35.258385000           K3III 1254 0
5 V* V1033 Sco HXB 16 54 00.1423963019 -39 50 44.761701340       16.14   F3-6IV 1980 0

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