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Universe's hidden supermassive black holes revealed

A team of scientists using NuSTAR detected high-energy X-rays from five supermassive black holes previously clouded from direct view by dust and gas.
RELATED TOPICS: BLACK HOLES | NUSTAR
NuSTAR_image
An illustration of the NuSTAR satellite observatory in orbit. The unique 10 meter long mast allows NuSTAR to focus high energy X-rays.
NASA/JPL-Caltech
Astronomers have found evidence for a large population of hidden supermassive black holes in the universe.

Using NASA’s Nuclear Spectroscopic Telescope Array (NuSTAR) satellite observatory, the team of international scientists detected the high-energy X-rays from five supermassive black holes previously clouded from direct view by dust and gas.

The research, led by astronomers at Durham University in the United Kingdom, supports the theory that potentially millions more supermassive black holes exist in the universe but are hidden from view.

The scientists pointed NuSTAR at nine candidate hidden supermassive black holes that were thought to be extremely active at the center of galaxies, but where the full extent of this activity was potentially obscured from view.

High-energy X-rays found for five of the black holes confirmed that they had been hidden by dust and gas. The five were much brighter and more active than previously thought as they rapidly feasted on surrounding material and emitted large amounts of radiation.
A Hubble Space Telescope color image of one of the nine galaxies targeted by NuSTAR.
A Hubble Space Telescope color image of one of the nine galaxies targeted by NuSTAR. The high energy X-rays detected by NuSTAR revealed the presence of an extremely active supermassive black hole at the galaxy center, deeply buried under a blanket of gas and dust.
Such observations were not possible before NuSTAR, which launched in 2012 and is able to detect much higher energy X-rays than previous satellite observatories.

“For a long time we have known about supermassive black holes that are not obscured by dust and gas, but we suspected that many more were hidden from our view,” said George Lansbury from Durham University.

“Thanks to NuSTAR, for the first time we have been able to clearly see these hidden monsters that are predicted to be there but have previously been elusive because of their ‘buried’ state.

“Although we have only detected five of these hidden supermassive black holes, when we extrapolate our results across the whole universe, then the predicted numbers are huge and in agreement with what we would expect to see.”

“High-energy X-rays are more penetrating than low-energy X-rays, so we can see deeper into the gas burying the black holes,” said Daniel Stern from NASA’s Jet Propulsion Laboratory in Pasadena, California. “NuSTAR allows us to see how big the hidden monsters are and is helping us learn why only some black holes appear obscured.”
An artist’s illustration of a supermassive black hole, actively feasting on its surroundings.
An artist’s illustration of a supermassive black hole, actively feasting on its surroundings. The central black hole is hidden from direct view by a thick layer of encircling gas and dust.
NASA/ESA
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