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The Extreme Spin of the Black Hole in Cygnus X-1
Lijun Gou, Jeffrey E. McClintock, Mark J. Reid +7
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 a…
The Mass of the Black Hole in Cygnus X-1
Jerome A. Orosz, Jeffrey E. McClintock, Jason P. Aufdenberg +4
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 Trigonometric Parallax of Cygnus X-1
Mark J. Reid, Jeffrey E. McClintock, Ramesh Narayan +3
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 (-0.11,+0.12)…
The Physics of the 'Heartbeat' State of GRS 1915+105
Joseph Neilsen, Ronald A. Remillard, Julia C. Lee
We present the first detailed phase-resolved spectral analysis of a joint Chandra High Energy Transmission Grating Spectrometer and Rossi X-ray Timing Explorer observation of the r…
X-Ray and Near-Infrared Observations of GX 339-4 in the Low/Hard State with Suzaku and IRSF
Megumi Shidatsu, Yoshihiro Ueda, Fumie Tazaki +10
X-ray and near-infrared (--) observations of the Galactic black hole binary GX 339--4 in the low/hard state were performed with Suzaku and IRSF in 2009 March. The…
Measuring the Spins of Accreting Black Holes
Jeffrey E. McClintock, Ramesh Narayan, Shane W. Davis +6
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. Bot…