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A Stellar Infant: Estimated Age

Based on the size of the structure and its measured expansion speed, the research team has placed a lower limit on its age. The object is estimated to be at least about 1,700 years old . Such an age makes it a cosmic infant compared to most other known remnants.

A Significant Caveat: "Possible" Status

It is crucial to note that the object is currently classified as a "possible" supernova remnant. The identification is based on its distinctive X-ray morphology—the barrel shape—and its X-ray spectrum, which is characteristic of hot gas heated by a powerful shock. Nevertheless, this is a preliminary identification, and astronomers have stated that further multi-wavelength observations are essential for a definitive confirmation .

How This Fits with Past and Present Galactic Center Research

The Legacy of SOFIA: A Different Kind of Remnant

Before its retirement in 2022, the Stratospheric Observatory for Infrared Astronomy (SOFIA) provided a unique view of the galactic center in infrared light. One of its key targets was Sgr A East, a well-known, larger, and much older supernova remnant that is also located near the black hole . SOFIA's observations were groundbreaking, revealing warm dust that had somehow survived inside the powerful shock waves propagating through Sgr A East . These studies showed that supernovae could be significant sources of cosmic dust, a key ingredient for planet formation .

The new candidate found by Chandra and XMM-Newton is entirely distinct. It is smaller, younger, and appears to be positioned even closer to Sgr A* than Sgr A East. While SOFIA traced the dusty aftermath of an ancient explosion, Chandra may have found the X-ray ghost of a much more recent stellar death, adding a second, more proximate supernova candidate to the extreme environment around the galaxy's core.

A Dynamic Duo: The Supernova and the Black Hole Wind

The discovery of this possible SNR comes at a time of renewed focus on the activity of Sgr A*. Just one week before the Chandra announcement, on June 4, 2026, a separate international team achieved a monumental breakthrough. After more than half a century of searching, they announced the first direct detection of a wind emanating from Sgr A* .

The team, led by Mark Gorski of Northwestern University, used the Atacama Large Millimeter/submillimeter Array (ALMA) to map cold carbon monoxide gas around the black hole with unprecedented detail. They discovered a massive, cone-shaped cavity carved into the gas—a clear footprint of a hot, fast wind pushing outward from the black hole . The study was published in The Astrophysical Journal Letters .

Taken together, these two findings fundamentally change our perception of the Milky Way's heart. Sgr A* is not a dormant, silent giant. It breathes—driving powerful winds—and the space around it is periodically rocked by stellar explosions. Earlier Chandra images had already revealed giant X-ray lobes stretching for a dozen light-years on either side of Sgr A*, evidence of powerful eruptions over the last ten thousand years . The new supernova candidate and the confirmed black hole wind reveal that this dynamic activity continues on much shorter, human-observable timescales, with stellar deaths and black-hole-driven outflows continuously sculpting the chaotic heart of our galaxy.