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Gaia BH3 is the first black hole discovered from preliminary Gaia DR4 astrometric data. [2] The black hole and star orbit the system barycentre every 11.6 years, with an orbital distance ranging from 4.5–29 AU. [3] The black hole's mass is 32.70 M ☉, the heaviest known stellar black hole in the Milky Way.
A black hole is a region of spacetime wherein gravity is so strong that no matter or electromagnetic energy (e.g. light) can escape it. [2] Albert Einstein's theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. [3] [4] The boundary of no escape is called the event horizon.
This makes it one of the most massive black holes ever discovered, more than six times the value of the black hole of Messier 87, which for 60 years was the largest known black hole, and was dubbed an "ultramassive" black hole. The Schwarzschild radius of this black hole is 120 billion kilometers, giving a diameter of 240 billion kilometers ...
M33 X-7 is a black hole binary system in the Triangulum Galaxy.The system is made up of a stellar-mass black hole and a companion star. The black hole in M33 X-7 has an estimated mass of 15.65 times that of the Sun (M ☉) [3] [4] (formerly the largest known stellar black hole, though this has now been superseded amongst electromagnetically-observed black holes by an increased mass estimate ...
The star and black hole orbit each other with a period of 185.59 days and an eccentricity of 0.45. The star is similar to the Sun , with about 0.93 M ☉ and 0.99 R ☉ , and a temperature of about 5,850 K (5,580 °C ; 10,070 °F ), while the black hole has a mass of about 9.62 M ☉ . [ 3 ]
IGR J17091-3624 (candidate smallest known stellar black hole) [14] [15] LB-1 (name of both a galactic B-type star and a very closely associated over-massive stellar-mass black hole) [16] [17] M33 X-7 (stellar black hole with the most massive stellar companion, located in the Triangulum Galaxy) [18]
One of the best-known examples of an event horizon derives from general relativity's description of a black hole, a celestial object so dense that no nearby matter or radiation can escape its gravitational field. Often, this is described as the boundary within which the black hole's escape velocity is greater than the speed of light.
The accompanying black hole was proposed to have a mass 3 times the mass of the Sun, corresponding to a Schwarzschild radius of 9 kilometers. [ 10 ] [ 11 ] Follow-up work in 2022 argued that V723 Monocerotis does not contain a black hole, but is a mass-transfer binary containing a red giant and a subgiant star that has been stripped of much of ...