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How many black holes are hiding? NASA study homes in one answer
An effort to find some of the biggest, most active black holes in the universe provides a better estimate for the ratio of hidden to unhidden behemoths.
The new study published in the Astrophysical Journal found that about 35% of supermassive black holes are heavily obscured, meaning the surrounding clouds of gas and dust are so thick they block even low-energy X-ray light. To confirm edge-on, heavily obscured black holes, the researchers relied on NASA’s NuSTAR(Nuclear Spectroscopic Telescope Array), an X-ray observatory also managed by JPL. NASA’s NuSTAR X-ray telescope, depicted in this artist’s concept, has helped astronomers get a better sense of how many supermassive black holes are hidden from view by thick clouds of gas and dust that surround them.
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