Newly discovered galaxies, dubbed "Little Red Dots," have long puzzled astronomers due to their striking appearance and properties. These tiny, glowing objects are thought to be harboring supermassive black holes that defy explanation, with some estimates suggesting they could be as massive as 10% of the galaxy's total mass.
Researchers had initially assumed these enigmatic galaxies were compact, distant galaxies, but this theory didn't quite add up. They then turned their attention to a second possibility: that the Little Red Dots were supermassive black holes themselves. However, this theory also faced significant challenges.
Enter Vadim Rusakov and his team, who stumbled upon an innovative solution while studying data from the James Webb Space Telescope (JWST). The researchers discovered that the unusual appearance of these galaxies could be explained by a previously unknown stage in the evolution of supermassive black holes.
According to Rusakov's team, young supermassive black holes may go through a "cocoon phase" where they grow rapidly surrounded by high-density gas and dust. This dense cocoon acts as a shield that blocks the high-energy X-rays and radio waves that typically signal an active black hole's presence. Instead, these objects emit light at very specific wavelengths in infrared, making them visible to JWST.
By analyzing data from 12 Little Red Dot galaxies, Rusakov's team found that their intrinsic velocity was much lower than previously estimated. This led to the conclusion that young supermassive black holes are likely tens of millions of times more massive than initially thought โ a figure much closer to the standard galaxy-to-black-hole mass ratio observed in our local universe.
The discovery of this cocoon phase represents a significant breakthrough, as it provides new insights into the early universe and how galaxies formed. While questions still remain about the duration and frequency of this stage in black hole evolution, researchers are optimistic that continued analysis of JWST data will shed more light on these enigmatic objects.
Researchers had initially assumed these enigmatic galaxies were compact, distant galaxies, but this theory didn't quite add up. They then turned their attention to a second possibility: that the Little Red Dots were supermassive black holes themselves. However, this theory also faced significant challenges.
Enter Vadim Rusakov and his team, who stumbled upon an innovative solution while studying data from the James Webb Space Telescope (JWST). The researchers discovered that the unusual appearance of these galaxies could be explained by a previously unknown stage in the evolution of supermassive black holes.
According to Rusakov's team, young supermassive black holes may go through a "cocoon phase" where they grow rapidly surrounded by high-density gas and dust. This dense cocoon acts as a shield that blocks the high-energy X-rays and radio waves that typically signal an active black hole's presence. Instead, these objects emit light at very specific wavelengths in infrared, making them visible to JWST.
By analyzing data from 12 Little Red Dot galaxies, Rusakov's team found that their intrinsic velocity was much lower than previously estimated. This led to the conclusion that young supermassive black holes are likely tens of millions of times more massive than initially thought โ a figure much closer to the standard galaxy-to-black-hole mass ratio observed in our local universe.
The discovery of this cocoon phase represents a significant breakthrough, as it provides new insights into the early universe and how galaxies formed. While questions still remain about the duration and frequency of this stage in black hole evolution, researchers are optimistic that continued analysis of JWST data will shed more light on these enigmatic objects.