Gaia, Palomar 5, and the Invisible Black-Hole Stream
About this episode
We dive into Gaia's map of Palomar 5—the fluffy globular cluster shedding a 20-degree tidal tail—to explore how a hidden population of stellar-mass black holes sculpts its structure. Through N-body simulations, researchers show that reproducing Palomar 5 requires about 100 black holes, roughly 20% of the cluster's mass. We also connect to Gaia BH3, the Milky Way's most massive stellar-origin black hole detected so far, confirming these objects exist. Together, these findings hint that Palomar 5 is dissolving into a ghost stream of black holes orbiting the Galaxy—a glimpse at the invisible architecture that holds our Milky Way together.
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