CO-0.40-0.22
CO-0.40-0.22 is a high velocity compact gas cloud near the centre of the Milky Way galaxy, Milky Way. It is 200 light years away from the centre in the central molecular zone. The cloud is in the shape of ellipse. The differences in the velocity, termed velocity dispersion, of the gas is unusually high at 100 km/s. The velocity dispersion was once thought to be due to an intermediate-mass black hole (IMBH) with a mass of about 100,000 solar masses. However, observations with the Atacama Large Millimeter/submillimeter Array suggested the evidence for a cloud-cloud collision. Subsequent theoretical studies of the gas cloud and nearby IMBH candidates have re-opened the possibility, though no observational evidence for existence of an IMBH has been reported. The molecular cloud has a mass of 4,000 solar masses. It is located at −0.40°, −0.22° galactic longitude and Galactic latitude, latitude. The cloud is 0.2° away from Sgr C to the galactic southeast. The gas is moving ...
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Intermediate-mass Black Hole
An intermediate-mass black hole (IMBH) is a class of black hole with mass in the range 102–105 solar masses: significantly more than stellar black holes but less than the 105–109 solar mass supermassive black holes. Several IMBH candidate objects have been discovered in our galaxy and others nearby, based on indirect gas cloud velocity and accretion disk spectra observations of various evidentiary strength. Observational evidence The gravitational wave signal GW190521, which occurred on 21 May 2019 at 03:02:29 UTC, and was published on 2 September 2020, resulted from the merger of two black holes, weighing 85 and 65 solar masses, with the resulting black hole weighing 142 solar masses, and 8 solar masses being radiated away as gravitational waves. Before that, the strongest evidence for IMBHs comes from a few low-luminosity active galactic nuclei. Due to their activity, these galaxies almost certainly contain accreting black holes, and in some cases the black hole masses c ...
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