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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 ]
The mass of the black hole in GRO J0422+32 falls in the range 3.66 to 4.97 solar masses. [6] This is the smallest yet found for any stellar black hole, and near the theoretical upper mass limit (~2.7 M ☉) for a neutron star. Further analysis in 2012 calculated a mass of 2.1 M ☉, which raises questions as to what the object actually is. [7]
Micro black holes, also called mini black holes or quantum mechanical black holes, are hypothetical tiny (<1 M ☉) black holes, for which quantum mechanical effects play an important role. [1] The concept that black holes may exist that are smaller than stellar mass was introduced in 1971 by Stephen Hawking .
Scientists have discovered what may be the smallest-known black hole in the Milky Way galaxy and the closest to our solar system - an object so curious that they nicknamed it 'the Unicorn.' The ...
NGC 4395 is one of the least luminous and nearest Seyfert galaxies known. [4] The nucleus of NGC 4395 is notable for containing one of the smallest supermassive black holes with a well-measured mass. [8] The central black hole has a mass of "only" 300,000 M ☉. [9] However, a recent study found a black hole mass of just 10,000 M ☉. [10]
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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 ...
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