Abstract
We investigate black hole-host galaxy scaling relations in cosmological
simulations with a self-consistent black hole growth and feedback model.
Our sub-grid accretion model captures the key scalings governing angular
momentum transport by gravitational torques from galactic scales down to
parsec scales, while our kinetic feedback implementation enables the
injection of outflows with properties chosen to match observed nuclear
outflows (star formation-driven winds are not included to isolate the
effects of black hole feedback). We show that `quasar mode' feedback can
have a large impact on the thermal properties of the intergalactic
medium and the growth of galaxies and massive black holes for kinetic
feedback efficiencies as low as 0.1 per cent relative to the bolometric
luminosity. None the less, our simulations indicate that the black
hole-host scaling relations are only weakly dependent on the effects of
black hole feedback on galactic scales, since black hole feedback
suppresses the growth of galaxies and massive black holes by a similar
amount. In contrast, the rate at which gravitational torques feed the
central black hole relative to the host galaxy star formation rate
governs the slope and normalization of the black hole-host correlations.
Our results suggest that a common gas supply regulated by gravitational
torques is the primary driver of the observed co-evolution of black
holes and galaxies.
Original language | English |
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Pages (from-to) | 2840-2853 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 464 |
Issue number | 3 |
DOIs | |
Publication status | Published - 6 Oct 2016 |
Keywords / Materials (for Non-textual outputs)
- galaxies: active
- galaxies: evolution
- galaxies: formation
- intergalactic medium
- quasars: supermassive black holes
- cosmology: theory