Search
Now showing items 1-7 of 7
The constant inner-disk radius of LMC X-3: A basis for measuring black hole spin
(IOP Publishing, 2010)
he 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 and highly variable. ...
A New Dynamical Model for the Black Hole Binary Lmc X-1
(IOP Publishing, 2009)
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 nearinfrared photometry. From our new optical data we find an orbital period of P ...
The Extreme Spin of the Black Hole in Cygnus X-1
(IOP Publishing, 2011)
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 for the orbital inclination ...
Confirmation via the Continuum-Fitting Method That the Spin of the Black Hole in Cygnus X-1 Is Extreme
(IOP Publishing, 2014)
In Gou et al., we reported that the black hole primary in the X-ray binary Cygnus X-1 is a near-extreme Kerr black hole with a spin parameter a∗ > 0.95 (3σ). We confirm this result while setting a new and more stringent ...
A Determination of the Spin of the Black Hole Primary in LMC X-1
(IOP Publishing, 2009)
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 values for the mass of ...
The Trigonometric Parallax of Cygnus X-1
(IOP Publishing, 2011)
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+0.12 – 0.11 kpc was obtained from a trigonometric ...
The Mass of the Black Hole in Cygnus X-1
(IOP Publishing, 2011)
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 paper, we first determine ...