2011
DOI: 10.1088/0004-637x/742/2/84
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The Mass of the Black Hole in Cygnus X-1

Abstract: 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 the radius of the companion star, thereby constraining the scale of the binary system. To obtain a full dynamical model of the binary, we use an extensive collection of optical photometric and spectroscopic data taken from the literature. By using all of the

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Cited by 383 publications
(399 citation statements)
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“…We fix the system parameters of distance, black hole mass and disk inclination at D = 1.86 kpc, M = 14.8 M ⊙ , and i = 27.1 deg Orosz et al 2011). The solar abundance table is set to Wilms et al (2000), and iron abundance is set to 1.…”
Section: Discussionmentioning
confidence: 99%
“…We fix the system parameters of distance, black hole mass and disk inclination at D = 1.86 kpc, M = 14.8 M ⊙ , and i = 27.1 deg Orosz et al 2011). The solar abundance table is set to Wilms et al (2000), and iron abundance is set to 1.…”
Section: Discussionmentioning
confidence: 99%
“…The innermost radius of diskbb is derived as r in = D N diskbb / cosi, where N diskbb is the normalization of the diskbb model. The distance D from the earth and the inclination angle i from our line of sight were adopted to be 1.86 kpc and 27 • , respectively (Orosz et al 2011). The hydrogen column density N H and the gaussian parameters were constrained to be common between the faint and the bright spectra in each state, but were allowed to differ between the two states.…”
Section: Energy Spectramentioning
confidence: 99%
“…, Table 5. The flux ratio R of equation (4), and the RMS variation η ′ of equation (5 (Orosz et al 2011). ‡ : In a unit of photons cm −2 s −1 keV −1 at 1 keV.…”
Section: Comparison With Short-term Variabilitymentioning
confidence: 99%
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“…In particular, the hard state spectrum above ∼2 keV is dominated by a power law component with photon index Γ ∼ 1.7, while in the soft state the thermal emission from the accretion disk is prominent and the contribution from a steeper power law component is low. Orosz et al (2011) determine the inclination of the binary system to i = 27. • 1 ± 0.…”
Section: Introductionmentioning
confidence: 99%