The James Webb Space Telescope (JWST) has detected a strong radiation signal of unknown origin in one of the most thoroughly studied regions of the universe. Scientists have difficulty explaining which celestial body originates from the signal recorded repeatedly during different observations.
The research, published in The Astrophysical Journal and led by astronomer Mason S. Huberty, points to the existence of a previously unknown celestial body in the depths of space.
Although the researchers had strong evidence that the signal came from a real astronomical source, they were unable to detect that source in the highly detailed images of the Hubble and James Webb telescopes.
The study emphasized that the signal cannot be easily associated with conventional astrophysical explanations and that new observations are needed to determine the source.
The discovery was made in the Hubble Ultra Deep Field, which has been observed by the Hubble Space Telescope for many years and where thousands of distant galaxies have been imaged.
This region, which astronomers use to investigate the early universe, hosts many distant celestial objects, although it covers an extremely small part of the sky.
However, this time, instead of a known galaxy or star, the researchers detected a single strong emission line in the infrared light spectrum at a wavelength of about 1.60 micrometers.
Emission lines appear when the light emitted by celestial objects is concentrated at certain wavelengths. By examining these lines, scientists can determine the chemical structure, physical properties and distances of objects in space.
Under normal conditions, multiple emission lines emitted by a celestial body make it easier to identify the source. However, the fact that there was only a single strong line in the newly discovered signal and the object producing this radiation could not be imaged left the researchers faced with an unusual situation.
THE SIGNAL WAS REPEATED IN DIFFERENT OBSERVATIONS
The research team developed a new observation method using James Webb's near-infrared spectrograph called NIRSpec.
The method, called Slit-Free Spectroscopy with Multiple Object Coronagraphy (MOCSS), uses microscopic apertures that control the light reaching the telescope's sensor.
Thanks to this system, by limiting the light of brighter and previously known celestial objects, weak radiation sources that are difficult to detect under normal conditions can be investigated.
The mysterious signal was recorded at four different observation locations and from two separate angles. Detecting the signal again under different conditions greatly reduced the likelihood that it was a simple instrument error or an artifact of the observation.
However, scientists pointed out that the presence of strong evidence that the signal is real does not mean that the celestial body producing the radiation has been identified. The researchers examined whether the signal was one of the emission lines from hydrogen and oxygen commonly seen in distant galaxies.
In this context, four different possibilities were evaluated. These possibilities include scenarios in which the redshift value, which indicates the shift of light to longer wavelengths due to the expansion of the universe, varies between 1.44 and 12.16.
The redshift value is used as an important criterion for astronomers to investigate the past positions of distant celestial objects and the period of the universe they belong to.
However, the unusual properties of the discovered emission line and the failure to detect other expected lines meant that none of these explanations could be easily confirmed with existing data.
Therefore, scientists cannot yet reliably determine how far away the source of the signal is.
CAN A BLACK HOLE BE THE SOURCE OF THE MYSTERIOUS SIGNAL?
One of the possibilities evaluated in the research is that the signal originates from an active galactic nucleus.
Active galactic nuclei are associated with the intense energy release that occurs when supermassive black holes at the centers of galaxies attract the matter around them.
Under some conditions, these regions can emit energy even stronger than the total radiation of the galaxy they are in.
Observations made by James Webb in recent years have also revealed unusual celestial objects that are thought to be connected to black holes surrounded by dense clouds of gas.
The researchers stated that the new signal may arise from a similar mechanism, but the current findings are not sufficient to confirm the black hole connection.
Another possibility is that the signal originates from a temporary astrophysical event. Some high-energy events occurring in space can produce strong radiation for a certain period of time and then disappear from view.
However, scientists emphasize that the available data do not definitively support any of these possibilities.
DISCOVERY MAY OPEN A NEW DOOR IN SPACE RESEARCH
The importance of the research is not limited to detecting a signal of unknown origin.
The new observation method developed reveals that James Webb can identify some radiation sources that cannot be seen even in the most detailed space images obtained to date.
It is evaluated that this development may provide new opportunities in the study of extremely distant, faint or unusual celestial objects, especially those that formed in the early stages of the universe.
According to scientists, the discovery also reveals an important limitation of modern astronomy: Detecting a signal coming from space does not necessarily mean that the physical event that creates it can be understood.
More detailed spectral analysis and new observations are needed to determine the source of the mysterious radiation.
Researchers think that if it is determined which celestial body the signal came from and how it was formed, new information can be obtained about the extraordinary physical processes occurring in the distant universe.
