The spin of the black hole 4U 1543-47

Abstract

We present a new analysis of Rossi X-ray Timing Explorer observations of the 2002 outburst of the transient X-ray nova 4U 1543-47. We focus on observations in the High/Soft state, and attempt to measure the spin of the black hole by simultaneously fitting the thermal disk continuum and by modeling the broadened iron k-shell emission lines and additional blurred reflection features. Previous works have found that use of these methods individually returns contradictory values for the dimensionless spin parameter a* =cJ/GM^2. We find that when used in conjunction with each other, a moderate spin is obtained (a*=0.43 +0.22 -0.31) that is actually consistent with both other values within errors. We discuss limitations of our analysis, systematic uncertainties, and implications of this measurement, and compare our result to those previously claimed for 4U 1543-47.

Accepted for publication in ApJ Letters

References in corpus (3)

• X-ray Properties of Black-Hole Binaries
• A Grid of Relativistic, non-LTE Accretion Disk Models for Spectral Fitting of Black Hole Binaries
• Diskoseismology and QPOs Confront Black Hole Spin

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• Wideband Study of the Brightest Black Hole X-ray Binary 4U 1543-47 in the 2021 Outburst: Signature of Disk-Wind Regulated Accretion
• Spin measurement of 4U 1543-47 with Insight-HXMT and NICER from its 2021 outburst: A test of accretion disk models at high luminosities
• The bright black hole X-ray binary 4U 1543--47 during 2021 outburst: a thick accretion disk inflated by high luminosity
• Alignment and precession of a black hole misaligned with its accretion disc: Application to Low Mass X-ray Binaries
• Using X-ray continuum-fitting to estimate the spin of MAXI J1305-704
• Rossby Wave Instability and High-Frequency Quasi-Periodic Oscillations in accretion discs orbiting around black holes
• Probing the soft state evolution of 4U 1543-47 during its 2021 outburst using AstroSat
• The effect of thermal winds on the outbursts evolution of LMXB systems