Dust-shrouded Milky Way star cluster may be nearly as old as the universe

A Primordial Cluster Hidden in the Galactic Core

Astronomers have determined the age of VVV CL001, a globular star cluster located near the center of the Milky Way. The analysis reveals that this metal-poor cluster is approximately 13.4 billion years old, making it one of the oldest known star clusters in our galaxy. The research paper, detailing the methodology used to estimate its age and distance, was posted to the arXiv preprint server on October 20 and has been accepted for publication in Astronomy & Astrophysics.

Overcoming Interstellar Dust to Measure Distance and Age

Studying VVV CL001 has long posed a significant challenge because the cluster lies behind thick clouds of interstellar dust near the galactic center. To establish its distance and age, astronomers relied on advanced methods capable of probing through dense dust lanes. Precise measurements confirmed that this metal-poor globular cluster survived since the early epoch of galaxy formation despite the observational hurdles posed by galactic interstellar matter.

Implications for Galactic Evolution and Future Observations

Confirming an age of 13.4 billion years for VVV CL001 provides key observational constraints for models of the early Milky Way and overall cosmic history. As a relic from the early universe, this cluster offers direct insights into how the galactic core first assembled. Researchers anticipate that the methodology established in this study will help uncover and analyze other heavily obscured star clusters in future observational campaigns.