Institute of Astronomy


Observations of nearby galaxies and high redshift quasars show that black holes are ubiquitous inhabitants of the vast majority of galaxies and that supermassive black holes, with masses in excess of billion Solar masses, already formed at the time when the Universe was less than 10% of it's current age.

Observations of very high redshift quasars indicate that the accreting black holes which are powering them have extreme properties: they are characterized by very high masses, in excess of a billion Solar masses, and they are very efficient accretors, close to the Eddington limit. The mere existence of these high redshift quasars and their accreting suppermassive black holes is a significant challenge for theoretical models, which need to explain how such massive object have managed to grow in less than a Gyr of cosmic time.

Quasar related research at the IOA focuses on a number of key themes.


Page last updated: 2 March 2011 at 00:40