The Mass of the Black Hole in Cygnus X-1 by Jerome A. Orosz and others Created 2026-10-20 Updated 2026-11-05
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The original study combines optical light curves, companion-star radial velocities, rotational broadening and a distance constraint to infer the compact object's mass. The result solar masses is the estimate from this 2011 analysis, rather than a claim about the latest mass determination.
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