"We were not supposed to see it": The unusual discovery in deep space

The James Webb Space Telescope has revealed a distant galaxy named JADES-GS-z13-1, which poses an unusual mystery for astronomers. The telescope managed to detect strong radiation from it of a type that was expected to be largely blocked by the hydrogen that was common in space at that time. Now, researchers are trying to understand how the radiation managed to exit the galaxy's environment, pass through space, and reach the telescope.

The new discovery does not concern the existence of the galaxy itself, but what managed to reach us from it. The galaxy, known as JADES-GS-z13-1, was discovered as part of the JADES survey. Researchers identified a strong emission of radiation called Lyman-alpha, which is associated with hydrogen and can appear in regions where stars are formed. However, this radiation was supposed to have a very hard time reaching us.

At the time when the light was emitted, large amounts of neutral hydrogen filled the space between galaxies. To understand the significance of this, one can think of this hydrogen as a kind of cosmic "fog" that effectively absorbs Lyman-alpha radiation. But in the case of JADES-GS-z13-1, the radiation managed to pass through with an intensity that allowed the James Webb to clearly detect it.

Kevin Hainline from the University of Arizona, who was a partner in the research, described the surprise:

"Given our understanding of the evolution of the universe, we really were not supposed to find such a galaxy. One can imagine the early universe as wrapped in a thick fog, which makes it very difficult to see even strong lighthouses through the fog. And yet, here we clearly see the light of the galaxy penetrating through this screen."

One of the possible explanations is that the galaxy was surrounded by a bubble where the hydrogen underwent a change that allowed the radiation to pass through more easily. Researchers are now trying to understand what created this bubble. One possibility is that the galaxy had unusual stars—much larger, hotter, and brighter than stars that formed at later stages. Their strong radiation could have changed the hydrogen around the galaxy and effectively cleared a path through which the light managed to exit.

Research team leader Joris Witstok explained:

"The large bubble of ionized hydrogen surrounding this galaxy could have been created by a special population of stars—massive, hot, and much brighter than stars that formed in later periods—and it is possible that they represent the first generation of stars."

Another possibility is that a black hole was active in the center of the galaxy. When a black hole pulls large amounts of matter toward it, its environment can release enormous energy, potentially creating conditions that allowed the radiation to pass. At this stage, the researchers do not have a final answer.

The importance of the finding stems from the fact that it does not completely fit the picture scientists had regarding the conditions that prevailed in space at that time. The fact that the radiation from JADES-GS-z13-1 is still clearly visible may indicate that the environment around certain galaxies changed faster or in a different way than researchers had estimated. Roberto Maiolino from the University of Cambridge noted that this result was completely unexpected compared to theories about the formation of the first galaxies.

The James Webb telescope allows scientists to observe extremely distant galaxies in the infrared spectrum. The team is planning further observations to find out what is behind the strong radiation: is it exceptionally unusual stars, an active black hole, or another explanation? At the center of the mystery stands a simple question: if conditions in space were supposed to hide a large part of the galaxy's light, what happened in its environment that allowed us to see it anyway?