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22-02-2018
Today's colloquium Growing massive black holes in the high redshift Universe
| Submitter: | Tiago Costa |
| Description: | Quasars have been detected out to z > 7, indicating that black holes with masses of order a billion solar masses assembled well within Gyr from the Big Bang. Using a suite of cosmological hydrodynamic simulations, I will show that the rapid growth of the first massive black holes can be accommodated within the current Lambda-CDM paradigm of galaxy formation, as long as the first quasars grow in rare and massive dark matter haloes. A key ingredient of models of black hole growth is the influence of quasar energy/momentum on the surrounding medium ("AGN Feedback"). I will argue that quasar outflows are likely to be driven by the expansion of hot `energy-driven' bubbles and, in some cases, by radiation pressure on dust. Finally, I will show how radiative cooling of hot outflows can naturally lead to spatially extended, fast, multi-phase outflows, in good agreement with recent observations. |
| Copyright: | Tiago Costa |
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