Formation of Globular Cluster HP 1 in the Milky Way Bulge
c. 12.8 Billion years ago · Prehistoric
Approximately 12.8 billion years ago, a dense cloud of primordial gas in the young Milky Way's galactic bulge collapsed and ignited a rapid burst of star formation, producing the tightly bound globular cluster HP 1. Located roughly 6,000 light-years from the galactic center, HP 1 is among the oldest surviving stellar structures in the Milky Way. Bayesian isochrone analysis of its color-magnitude diagram, using adaptive optics imaging from Gemini Observatory and archival Hubble data, established its age. The cluster's metal-poor stellar populations preserve a chemical record of conditions in the early galaxy.
Topics
Milky Waycosmologystellar formationglobular clustersgalactic archaeology
Connected Events — 5 Connections
HP 1 is among the oldest surviving structures within the Milky Way, forming in the galactic bulge during the galaxy's earliest epoch Formation of Milky Way Galaxy
HP 1 formed from gas enriched by the earliest stellar nucleosynthesis, its metal-poor composition reflecting the limited heavy elements available at the time First Heavy Elements: Birth of Stellar Nucleosynthesis
The Gaia-Enceladus merger brought at least eight globular clusters into the Milky Way, adding to the population of ancient clusters like HP 1 that had formed in the galaxy's bulge Gaia-Enceladus Dwarf Galaxy Merges with the Milky Way
The star formation burst occurred billions of years after globular clusters like HP 1 had formed, representing a later phase of sustained star birth in the Milky Way disk rather than the bulge Milky Way Star Formation Burst Recorded in Presolar Grains
The Cosmic Gems proto-clusters at 460 Myr represent the earliest known precursors to mature globular clusters like HP 1, which formed roughly 500 million years later in the Milky Way's bulge Cosmic Gems Arc: Proto-Globular Star Clusters Form at Extreme Density
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