X-Rays from the Globular Cluster G1: Intermediate-Mass Black Hole or Low-Mass X-Ray Binary?

@article{Pooley2006XRaysFT,
  title={X-Rays from the Globular Cluster G1: Intermediate-Mass Black Hole or Low-Mass X-Ray Binary?},
  author={David Pooley and Saul Rappaport},
  journal={The Astrophysical Journal},
  year={2006},
  volume={644}
}
The globular cluster G1 (Mayall II) in M31 is the most massive (~107 M☉) stellar cluster in the Local Group, and it has the highest central velocity dispersion (~28 km s-1). It has been claimed to host a central ~20,000 M☉ black hole, but these claims have been controversial. We investigate here the XMM-Newton detection of X-ray emission from G1 at a level of LX ≈ 2 × 1036 ergs s-1. This emission could be the result of Bondi-Hoyle accretion of ionized cluster gas by a central black hole, or it… 

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