Using NASA’s Chandra X-ray Observatory, a team of astronomers has identified a possible new supernova remnant in the central region of the Milky Way. If confirmed, this discovery would represent one of the closest stellar explosion remnants ever observed to Sagittarius A*, the supermassive black hole at the heart of our Galaxy.
The central region of the Milky Way is one of the most complex environments in our Galaxy. It is a hub of very massive stars, dense gas clouds, and intense magnetic fields, all under the gravitational influence of the Sagittarius A* black hole. It is within this area that astronomers have detected an X-ray source that could be the remnant of a star that exploded thousands of years ago.
The discovery was made possible by combining data from Chandra and the European Space Agency’s XMM-Newton space telescope. The observations reveal an extended X-ray emitting structure within a larger expanding gas cloud. According to the study’s authors, published in The Astrophysical Journal, this emission might be what remains of a supernova that occurred at least 1700 years ago in the galactic center.
A Stellar Explosion at the Heart of the Galaxy?
The candidate supernova remnant is located approximately 26,000 light-years from Earth, in the same region as Sagittarius C, a large ionized gas cloud associated with a young, massive star. In the past, observations from the SOFIA observatory had already indicated the presence of an expanding gas shell in this area, suggesting that a stellar explosion might have taken place there.
The new X-ray observations strengthen this hypothesis. If it is indeed a supernova remnant, the material ejected by the explosion would still be expanding at a speed of about 3.2 million kilometers per hour. Astronomers estimate the structure to be at least 1700 years old, though it could be even older.
Supernova remnants are a crucial phase in stellar evolution. When a massive star reaches the end of its life, its explosion disperses elements such as oxygen, silicon, and iron, produced within the star’s core during its lifetime, into space. This material enriches the interstellar medium and contributes to the formation of new generations of stars and planets.
Not All Questions Have Been Answered Yet
To verify the nature of the source, researchers searched the X-ray observations for traces of chemical elements that typically characterize a supernova remnant. These signals were not clearly identified, but the authors suggest this could be because the material ejected by the explosion has already mixed with the surrounding gas, making it more difficult to distinguish.
An alternative explanation also exists: the X-ray source could be produced by a cluster of massive stars in the region. However, the team considers this possibility unlikely, as the observed luminosity is more than ten times higher than that measured in known large star clusters containing very bright and massive stars.
If the nature of the source is confirmed by future observations, the new supernova remnant will offer astronomers a rare opportunity to study how stellar explosions interact with the extreme environment surrounding the supermassive black hole at the center of the Milky Way. This region, despite being relatively close in astronomical terms, continues to hold many aspects that are still poorly understood.
