There's something odd about the black holes discovered to date. We've found hardly any black holes in the intermediate mass range, and it's not clear why.
There’s something odd about the black holes discovered to date. We’ve found plenty of smaller black holes, with masses less than 100 times that of the sun, and plenty of huge black holes, with masses millions or even billions of times that of the sun. But we’ve found hardly any black holes in the intermediate mass range, arguably not enough to confirm that they even exist, and it’s not really clear why.
It’s tricky to spot these intermediate black holes because the effect they have on stars around them is more modest than that of the huge supermassive black holes that astronomers usually observe. Hubble has been observing targets like Messier 4, a globular cluster that is thought to hold a black hole with a mass around 800 times that of the sun. The black hole can’t be observed directly, but its presence can be inferred by looking at its subtle effects on nearby stars.
Recommended Videos “Using the latest Gaia and Hubble data, it was not possible to distinguish between a dark population of stellar remnants and a single larger point-like source,” explained the lead author of the research, Eduardo Vitral of the Space Telescope Science Institute, in a statement. “So one of the possible theories is that rather than being lots of separate small dark objects, this dark mass could be one medium-sized black hole.
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