Energy input from quasars regulates the growth and activity of black holes and their host galaxies

  title={Energy input from quasars regulates the growth and activity of black holes and their host galaxies},
  author={Tiziana di Matteo and Volker Springel and Lars E. Hernquist},
In the early Universe, while galaxies were still forming, black holes as massive as a billion solar masses powered quasars. Supermassive black holes are found at the centres of most galaxies today, where their masses are related to the velocity dispersions of stars in their host galaxies and hence to the mass of the central bulge of the galaxy. This suggests a link between the growth of the black holes and their host galaxies, which has indeed been assumed for a number of years. But the origin… 

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