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Cygnus X-1 (abbreviated Cyg X-1) [11] is a galactic X-ray source in the constellation Cygnus and was the first such source widely accepted to be a black hole. [12] [13] It was discovered in 1964 during a rocket flight and is one of the strongest X-ray sources detectable from Earth, producing a peak X-ray flux density of 2.3 × 10 −23 W/(m 2 ⋅Hz) (2.3 × 10 3 jansky).
Sh 2-101, at least in the field seen from Earth, is in close proximity to microquasar Cygnus X-1, site of one of the first suspected black holes. Cygnus X-1 is located about 15′ west of Sh 2-101. The companion star of Cygnus X-1 is a spectral class O9.7 Iab supergiant with a mass of 21 solar masses and 20 times the radius of the Sun.
Another black hole in Cygnus is V404 Cygni, which consists of a K-type star orbiting around a black hole of around 12 solar masses. [44] The black hole, similar to that of Cygnus X-3, has been hypothesized to be a quark star. [45] 4U 2129+ 47 is another X-ray binary containing a neutron star which undergoes outbursts, [46] as is EXO 2030+ 375. [47]
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The first strong candidate for a black hole, Cygnus X-1, was discovered in this way by Charles Thomas Bolton, [186] Louise Webster, and Paul Murdin [187] in 1972. [188] [189] Some doubt remained, due to the uncertainties that result from the companion star being much heavier than the candidate black hole. Currently, better candidates for black ...
Of these, Cygnus A became the first radio galaxy, the other two being nebulae inside the Milky Way. [5] In 1953 Roger Jennison and M K Das Gupta showed it to be a double source. [6] Like all radio galaxies, it contains an active galactic nucleus. The supermassive black hole at the core has a mass of (2.5 ± 0.7) × 10 9 M ☉. [3]
The images show the Perseus Cluster and the Centaurus Cluster, each with a central black hole appearing as a bright white dot surrounded by patches and filaments of gas.
Chandra image of Cygnus X-1, which was the first strong black hole candidate to be discovered. Black holes give off radiation because matter falling into them loses gravitational energy which may result in the emission of radiation before the matter falls into the event horizon. The infalling matter has angular momentum, which means that the ...