NASA's Chandra X-ray Observatory has discovered a potential supernova remnant near the Milky Way's core, dating back to around 300 AD. This discovery, made by astronomers Zhenlin Zhu, Mark Morris, Gabriele Ponti, and Ping Zhou, is significant because it could be one of the closest supernova remnants ever identified to Sagittarius A*, the supermassive black hole at the galactic center. The team's findings, published in The Astrophysical Journal, suggest that the X-ray emission is more than ten times brighter than that of large, known clusters of bright, massive stars, making it a strong candidate for a supernova remnant. However, the lack of enhanced amounts of elements forged in the blast, such as iron, oxygen, and silicon, raises questions about the interpretation of the data. The team's analysis of archived X-ray data from five observations taken between 2001 and 2014, combined with XMM-Newton data, reveals a blob of X-ray emission embedded in a larger bubble of expanding gas around a young, massive star. This bubble, known as Sagittarius C, is a star-forming region about 26,000 light-years from Earth. The team estimates that the supernova remnant is expanding at approximately two million miles per hour and is at least 1,700 years old, suggesting an explosion around 300 AD or earlier. This discovery adds to previous hints from the SOFIA mission, which had already shown an expanding shell of gas around Sagittarius C, indicating a star explosion in the same spot. The confirmation of this supernova remnant would be valuable for studying the lives and deaths of stars in the most crowded part of the galaxy, but further X-ray observations are needed to settle the matter. The Space Daily Editorial Team emphasizes the importance of this discovery, highlighting the potential for a deeper understanding of stellar evolution and the challenges of detecting remnants in dense galactic regions.
