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Study Published in The Astrophysical Journal Letters Indicates That Collisions Between Excited Dark Matter Particles May Generate Three Mysterious Signals Detected in the Center of the Milky Way, Including the 511 keV Emission Line, 2 MeV Radiation, and Elevated Ionization Levels in the Central Molecular Zone
Astronomers claim to have identified the possible origin of three mysterious signals from the center of the Milky Way after analyzing data from space telescopes and proposing that collisions between excited dark matter particles could explain radiation peaks detected for years.
For years, researchers have tried to understand strange energy spikes observed in the central region of the galaxy. These mysterious signals were detected at different wavelengths and remained unexplained within traditional models of astrophysical phenomena.
A recent study proposes that a specific type of dark matter, known as excited dark matter, could simultaneously explain part of these phenomena. The hypothesis was presented in a paper published in the scientific journal The Astrophysical Journal Letters.
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According to scientists, dark matter is an extremely difficult substance to detect. It is estimated to represent about a quarter of the universe, but its presence can only be inferred from its gravitational effects on visible matter.
Center of the Milky Way Concentrates Energetic Phenomena and Mysterious Signals
The core of the Milky Way is described by scientists as an extremely turbulent region. In this area, intense gravitational forces compress clouds of gas and contribute to the formation of stars that move rapidly through the galactic center.
At the heart of this region lies Sagittarius A*, a supermassive black hole with a mass about four million times greater than that of the Sun. The extreme gravity and heat generated in the surroundings release radiation that can be detected by space instruments.
Despite these observations, some mysterious signals continue to defy explanations based solely on known processes. One example is a specific peak of gamma radiation known as the 511 keV emission line.
This type of radiation does not fit into the current understanding of how ordinary matter produces energy in the galactic environment. Therefore, researchers began to investigate other possibilities to explain the phenomenon.
Excited Dark Matter Model May Explain Mysterious Signals Simultaneously
The study was conducted by a team led by Dr. Shyam Balaji, a researcher at King’s College London. According to him, traditional models involving star explosions and other astrophysical events have not fully explained the mysterious signals observed.
According to the scientist, the excited dark matter model offers a possibility that can explain at least two, and possibly three, of these phenomena at the same time. This is because the behavior of these particles can produce detectable energy indirectly.
In this theoretical scenario, dark matter particles collide with each other and temporarily enter a higher energy state. When they return to their normal state, they release extra energy in the form of particles known as electrons and positrons.
These positrons end up generating signals that can be detected by space telescopes. Sensitive instruments can capture the effects of these interactions even without directly observing dark matter.
INTEGRAL Space Telescope Provided Data Used in the Analysis
To test the hypothesis, researchers used data from the INTEGRAL mission of the European Space Agency. The telescope is located outside the Earth’s radiation belts, about 60,000 kilometers above sea level.
The team compared INTEGRAL observations with a model simulating the movement of positrons through space. The analysis showed that collisions between these particles could generate the gamma radiation peak associated with the 511 keV emission line.
This result suggests that the mysterious signals detected in the center of the Milky Way may be an indirect consequence of excited dark matter activity. The process would produce positrons in the quantity and energy observed by the telescopes.
Researchers point out that the energy of these particles corresponds to a specific range of several million electron volts. This pattern is not typically produced by conventional astrophysical sources.
Positron Emission May Explain Other Mysterious Signals in the Galaxy
In addition to the 511 keV emission line, the model can also explain another phenomenon detected in the center of the galaxy. It is an extremely energetic radiation known as the 2 MeV gamma-ray continuum.
According to scientists, this emission also requires positrons with very specific energy levels. Traditional sources like supernovae or cosmic rays typically produce particles with higher energies or distributed differently throughout the galaxy.
The excited dark matter model, however, naturally produces particles in this energy range. This reinforces the hypothesis that the invisible substance may be linked to several of the mysterious signals observed in the central region of the Milky Way.
Researchers also suggest that the same mechanism could explain elevated ionization levels detected in a gas cluster. This cluster is located within an area called the Central Molecular Zone.
Gas-Rich Region May Reveal Clues About Dark Matter
The Central Molecular Zone is located about 28,000 light years from Earth. This region contains nearly 80% of the dense gas in the galaxy and serves as a vast reservoir of matter and moving stars.
Observations indicate that the gas in this area exhibits exceptionally high ionization levels. However, known sources such as cosmic rays cannot fully explain this behavior.
Scientists suggest that the positrons generated by collisions of excited dark matter could contribute to this process. This possibility expands the number of phenomena that could be explained by a single mechanism.
Damon Cleaver, co-author of the study and a PhD student at King’s College London, states that a theory capable of explaining multiple observations would be an important advance for research.
Future Space Missions May Test Hypothesis About Mysterious Signals
According to researchers, future space missions may directly test this hypothesis. More sensitive instruments could analyze the mysterious signals coming from the center of the Milky Way with greater precision.
These observations could confirm whether excited dark matter actually produces positrons in the quantity needed to generate the detected signals.
If the hypothesis is validated, it would help clarify some of the most persistent phenomena in astronomy.
Dark matter remains one of the most enigmatic substances in the universe. Although it has never been directly observed, its gravitational effects indicate that it plays a fundamental role in the structure of galaxies.
Calculations suggest that many galaxies would not remain bound if it were not for a significant amount of dark matter acting as a kind of gravitational glue.
Currently, it is believed that only about 5% of the observable universe is made up of known matter.
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