An intermediate-mass black hole might be lurking within a dense stellar cluster — a discovery that could point toward how these oddities form.
Two sources tens of millions of light-years away have sent puzzling X-ray flares blazing our way. Now astronomers think they might have the answer: intermediate-mass black holes.
Astronomers think a bright X-ray source in the galaxy NGC 1313 is a mid-size black hole.
Two new studies suggest that ultraluminous X-ray sources are not all created by beefy black holes.
Scientists have found what seems to be an intermediate-mass black hole in a spiral galaxy 100 million light-years away. If its size is confirmed, it could provide much-needed insight into black hole evolution.
Astronomers have identified the smallest supermassive black hole ever detected in a galaxy’s center.