The mystery behind 'little red dots' discovered by James Webb Telescope has finally been solved
The mystery of the red light-emitting objects that were observed by the James Webb Space Telescope has finally been solved. The "little red dots" that were discovered in 2021 are actually baby black holes that are going through a massive growth spurt, according to a new study that has been published in the journal Nature.
When the JWST started to transmit images from its orbit, which is 1.5 million kilometers away, scientists were baffled by the presence of small red dots in the distant regions of space. These dots were present when the universe was just a few hundred million years old (that is pretty young on the cosmic scale), but they disappeared after a billion years. The first theory that came up was that these are giant galaxies. But this theory does not fit the current understanding of how long it takes for galaxies to develop. Scientists at the Cosmic Dawn Center of the Niels Bohr Institute have now proved that these are much smaller and more active than previously thought.
According to the study, these dots are actually young black holes that are thickly clouded with gas. As the black hole ingests the gas, it generates extreme amounts of heat. “This radiation through the cocoon is what gives little red dots their unique red color,” said Professor Darach Watson, one of the lead researchers on the project, in a statement. Although these black holes weigh 10 million times more than our Sun, they are actually “lightweights” compared to the black holes that have been discovered so far. And while they are growing, they are “messy eaters” because they consume just part of the gas that they suck in, with the rest being blown back out into space because of the immense heat.
This discovery expands our existing knowledge of the history of the universe. For many years, there was no explanation for how supermassive black holes, some of which are a billion times more massive than the Sun, could have appeared so quickly after the Big Bang. By revealing themselves as black holes in an unseen period of rapid growth, "little red dots" provide some answers. The dense gas cocoons that surround them are fueling stations that pump gas into the black holes at an incredible rate, allowing them to reach massive sizes in a remarkably short period of time. Moreover, their existence is compatible with our current knowledge of physics because they are actually much smaller than previously thought. Scientists no longer have to search for unusual or "new" types of events in the universe to explain their existence.
The James Webb Space Telescope has played a huge role in furthering our understanding of the early universe. By detecting these little red dots and helping solve the mystery behind them, it just added another feather to its cap.
