Density and Kinematic Cusps in M54 at the Heart of the Sagittarius Dwarf Galaxy: Evidence for A 104 M ☉ Black Hole?

@article{Ibata2009DensityAK,
  title={Density and Kinematic Cusps in M54 at the Heart of the Sagittarius Dwarf Galaxy: Evidence for A 104 M ☉ Black Hole?},
  author={R. Ibata and M. Bellazzini and S. Chapman and E. Dalessandro and F. Ferraro and M.Irwin and B. Lanzoni and G. Lewis and A. Mackey and P. Miocchi and A. Varghese},
  journal={The Astrophysical Journal},
  year={2009},
  volume={699}
}
  • R. Ibata, M. Bellazzini, +8 authors A. Varghese
  • Published 2009
  • Physics
  • The Astrophysical Journal
  • We report the detection of a stellar density cusp and a velocity dispersion increase in the center of the globular cluster M54, located at the center of the Sagittarius dwarf galaxy (Sgr). The central line-of-sight velocity dispersion is 20.2 ± 0.7 km s-1, decreasing to 16.4 ± 0.4 km s-1 at 25 (0.3 pc). Modeling the kinematics and surface density profiles as the sum of a King model and a point-mass yields a black hole mass of ~9400 M ☉. However, the observations can alternatively be explained… CONTINUE READING
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