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JWST found a black hole wearing a star as a coat
MoM-BH*-1 shines about 100 billion times brighter than a typical star and may be a whole new category of object.
The James Webb Space Telescope has been turning up faint smudges in the early universe that nobody could explain. Astronomers nicknamed them little red dots. Red, in telescope terms, mostly means far away, because the universe is expanding and light stretches toward the red end of the spectrum on its way to us. Far away also means long ago. Some of these dots are light that left its source about 300 million years after the Big Bang, when the universe was roughly two percent of its current age.
MIT's Rohan Naidu and Robert Simcoe led the team that pinned down what one of them appears to be, and it is not on the list. They call it MoM-BH*-1: a black hole of about 100,000 solar masses wrapped inside an envelope of hydrogen gas roughly the size of our entire solar system. The whole thing shines about 100 billion times brighter than a typical star.
The proposed name for the category is a black hole star. Think of it as a black hole in a bathrobe. The hole itself emits nothing, but gas falling toward it heats up and blazes, and here that glow is trapped and re-radiated by an enormous hydrogen shell, so from a distance it reads as a single absurdly luminous object rather than a naked black hole. If this holds, it explains the little red dots and it gives cosmologists a mechanism for how supermassive black holes got so big so fast, which has been an open embarrassment for years.
Published in Nature on August 12. One object so far, so the category is a proposal, not a settled fact, and the next few of these will decide it.
Read the original at MIT Kavli Institute / Nature, via ScienceDaily →