What is the center of a globular clusters made of?

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The center of a globular cluster is primarily composed of stars, with some clusters potentially harboring intermediate-mass black holes, although their presence is not essential for the cluster's stability. Globular clusters exhibit high star density, leading to frequent interactions and the formation of exotic stars like blue stragglers. Their long-term stability is attributed to mutual gravitational attraction among the stars, allowing them to remain tightly bound over billions of years. Observations have confirmed the existence of intermediate-mass black holes in specific clusters, suggesting a correlation between the mass of these black holes and the mass of the clusters. Overall, globular clusters are ancient stellar systems that provide insights into the formation and evolution of galaxies.
  • #51
Black holes in globular clusters appear to be rare, or at least, mostly undiscovered. This quote, "In 2007, Maccarone made the first discovery of a black hole in a globular star cluster in the neighboring NGC4472 galaxy." from PHYSICISTS FIND BLACK HOLES IN GLOBULAR STAR CLUSTERS, UPSETTING 40 YEARS OF THEORY shows how recent the discovery of black holes in globular clusters actually is. I think only a few GCs are currently known to harbor black holes. And if you look at the image above, showing the location of the two BHs, you'll see that they are not actually in the center, but near it, which might be more of a reflection on statistics than an 'evolution of globular cluster' occurrence.

What struck me about the paper was that there appear to be many black holes in this one GC. As it stands now, there are only a few GC known to have black holes. And new to me was the idea that the black holes get ejected. If so, there should be renegade black holes flying through space.
 
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