NASA's Chandra X-ray spacecraft has disentangled a mysterious X-ray flare from the globular cluster NGC 6540, revealing it originated from three separate sources. The findings, published on the preprint server arXiv on June 1, stem from a deep observational campaign targeting the cluster's peculiar emission recorded roughly 20 years ago.
The resolution of a singular flare into multiple emitters within a dense globular cluster challenges standard assumptions about such events. NGC 6540, a packed collection of old stars, often hosts exotic interactions that generate high-energy bursts, making this discovery significant for understanding stellar dynamics.
Chandra's high-resolution detectors were key to separating the three X-ray sources amid the cluster's crowded core. Astronomers used long-exposure data to map the faint emissions, with the arXiv study detailing how advanced imaging techniques teased apart the overlapping signals.
The finding suggests that what was once thought to be a single explosive event could be a common but overlooked phenomenon in globular clusters. Researchers now plan to investigate whether similar multi-source flares are hidden in other archival Chandra observations.
"This demonstrates the power of deep X-ray imaging to unlock secrets from decades-old data," the study authors noted, though the specific astrophysical nature of each source remains under investigation.