Astronomers want to understand how intermediate-mass black holes form and where they stand in black hole formation models.
A simulated stellar cluster made using DRAGON-II simulations. Orange and yellow dots represent sunlike stars, while the blue dots indicate stars with masses of 20 to 300 times that of the Sun. The large white object in the center represents a star with a mass of about 350 solar masses, which will shortly collapse to form an intermediate-mass black hole. Could this model explain intermediate-mass black holes? Courtesy M.
Intermediate-mass black holes lie somewhere in the mass range between stellar mass and supermassive. They should be between 100 and 100,000 solar masses. For comparison, stellar-mass black holes range up to several tens of solar masses. Supermassive black holes found at the centers of galaxies can be monsters up to a billion times the mass of the Sun.
It’s not that there aren’t any out there. Observers found candidate IMBH in our own Milky Way. They also seem to be in dim active galactic nuclei that appear to have accreting black holes. In addition, some ultra-luminous X-ray sources could also have these “medium-sized” black holes. However, those require further observation. The Sloan Digital Sky Survey has also uncovered a handful of possible IMBH candidates that are bright in X-rays.
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