Two ten-billion-solar-mass black holes at the centres of giant elliptical galaxies

@article{McConnell2011TwoTB,
  title={Two ten-billion-solar-mass black holes at the centres of giant elliptical galaxies},
  author={Nicholas McConnell and Chung-Pei Ma and Karl Gebhardt and Shelley A. Wright and Jeremy D. Murphy and Tod R. Lauer and James R. Graham and Douglas O. Richstone},
  journal={Nature},
  year={2011},
  volume={480},
  pages={215-218}
}
Observational work conducted over the past few decades indicates that all massive galaxies have supermassive black holes at their centres. Although the luminosities and brightness fluctuations of quasars in the early Universe suggest that some were powered by black holes with masses greater than 10 billion solar masses, the remnants of these objects have not been found in the nearby Universe. The giant elliptical galaxy Messier 87 hosts the hitherto most massive known black hole, which has a… 
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