Abstract: | Using 3D cosmological smoothed particle hydrodynamics (SPH) simulations,
we develop a sub-grid model of gas accretion onto supermassive black holes (SMBH)
that considers the accretion of cold blobs instead of hot gas.
In our simulations, the SMBH accretion rate is not estimated by the Bondi formula,
but rather based on non-spherical mass supply from cold, gravitationally bound SPH particles.
We take into account mechanical feedback in a form of outflowing wind from the material originating from the cold inflow.
The accreted part of the inflowing material liberates energy that heats the surrounding gas and together with the mechanical feedback affects the evolution of the host galaxy.
The predicted accretion rate is time-variable and is strongly connected to both the feedback processes and the availability of cold material.
Our model can account for the expected BH mass density, the cosmic star formation rate density, and other cosmological properties. |