A 40 Billion Solar-mass Black Hole in the Extreme Core of Holm 15A, the Central Galaxy of Abell 85

@article{Mehrgan2019A4B,
  title={A 40 Billion Solar-mass Black Hole in the Extreme Core of Holm 15A, the Central Galaxy of Abell 85},
  author={Kianusch Mehrgan and Jens Thomas and Roberto P. Saglia and Ximena Mazzalay and Peter Erwin and Ralf Bender and Matthias Kluge and Maximilian Fabricius},
  journal={The Astrophysical Journal},
  year={2019},
  volume={887}
}
Holm 15A, the brightest cluster galaxy of the galaxy cluster Abell 85, has an ultradiffuse central region, ∼ 2 mag fainter than the faintest depleted core of any early-type galaxy (ETG) that has been dynamically modeled in detail. We use orbit-based, axisymmetric Schwarzschild models to analyze the stellar kinematics of Holm 15A from new high-resolution, wide-field spectral observations obtained with the Multi-Unit Spectroscopic Explorer at the Very Large Telescope. We find a supermassive black… 

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