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THE MASS OF THE BLACK HOLE IN CYGNUS X-1
Cygnus X-1 is a binary star system that is comprised of a black hole and a massive giant companion star in a tight orbit. Building on our accurate distance measurement reported in the preceding
THE TRIGONOMETRIC PARALLAX OF CYGNUS X-1
We report a direct and accurate measurement of the distance to the X-ray binary Cygnus X-1, which contains the first black hole to be discovered. The distance of 1.86{sup +0.12}{sub -0.11} kpc was
The Extreme Spin of the Black Hole in Cygnus X-1
The compact primary in the X-ray binary Cygnus X-1 was the first black hole to be established via dynamical observations. We have recently determined accurate values for its mass and distance, and
THE INCLINATION OF THE SOFT X-RAY TRANSIENT A0620–00 AND THE MASS OF ITS BLACK HOLE
We analyze photometry of the soft X-ray transient A0620−00 spanning nearly 30 years, including previously published and previously unpublished data. Previous attempts to determine the inclination of
The spin of the black hole microquasar XTE J1550−564 via the continuum-fitting and Fe-line methods
We measure the spin of XTE J1550−564 using the two leading methods: (i) modelling the thermal continuum spectrum of the accretion disc; and (ii) modelling the broad red wing of the reflection
A NEW DYNAMICAL MODEL FOR THE BLACK HOLE BINARY LMC X-1
We present a dynamical model of the high mass X-ray binary LMC X-1 based on high-resolution optical spectroscopy and extensive optical and near-infrared photometry. From our new optical data we find
The Spin of the Black Hole Primary in LMC X-1
The first extragalactic X-ray binary, LMC X-1, was discovered in 1969. In the 1980s, its compact primary was established as the fourth dynamical black hole candidate. Recently, we published accurate
The Spin of the Black Hole in the Soft X-ray Transient A0620--00
During its year-long outburst in 1975-76, the transient source A0620-00 reached an intensity of 50 Crab, an all-time record for any X-ray binary. The source has been quiescent since then. We have
Measuring the Spins of Accreting Black Holes
A typical galaxy is thought to contain tens of millions of stellar-mass black holes, the collapsed remnants of once massive stars, and a single nuclear supermassive black hole. Both classes of black
THE CONSTANT INNER-DISK RADIUS OF LMC X-3: A BASIS FOR MEASURING BLACK HOLE SPIN
The black hole binary system LMC X-3 has been observed by virtually every X-ray mission since the inception of X-ray astronomy. Among the persistent sources, LMC X-3 is uniquely both habitually soft
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