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Cygnus X-1’s Stellar-Mass Black Hole is More Massive than Astronomers Thought | Astronomy – Sci-News.com
A black hole in the Cygnus X-1 binary system is so massive that it challenges current stellar evolution models.
A black hole in the Cygnus X-1 binary system is so massive that it challenges current stellar evolution models.
An artists impression of the Cygnus X-1 binary system. Image credit: International Centre for Radio Astronomy Research.
Discovered in 1964, Cygnus X-1 is an X-ray binary system located in the constellation Cygnus.
The primary star, HD 226868, is a hot supergiant revolving about an unseen compact companion with a period of 5.6 days.
The companion is a so-called stellar-mass black hole,…
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