.. _physics-blackHoleCGMHeating:

Black Hole CGM Heating
======================

Class providing models of the heating rate (in :math:`\mathrm{M}_\odot` (km/s)\ :math:`^2` Gyr\ :math:`^{-1}`) delivered by an active galactic nucleus to the :term:`CGM` of its host halo. AGN heating of the :term:`CGM` is a key mechanism for quenching star formation in massive galaxies ("radio-mode" or "maintenance-mode" feedback), counterbalancing radiative cooling of the hot gas atmosphere. Implementations may couple the jet power, the wind power, or a fixed fraction of the AGN bolometric luminosity to the surrounding hot gas.

**Default implementation:** ``blackHoleCGMHeatingJetPower``

Methods
-------

``heatingRate`` → ``double precision``
   Compute the heating rate of the CGM due to the given ``blackHole``.

   * ``class(nodeComponentBlackHole), intent(inout) :: blackHole``

.. _physics-blackHoleCGMHeatingJetPower:

``blackHoleCGMHeatingJetPower``
-------------------------------

A black hole CGM heating class that models AGN radio-mode feedback by coupling the accretion disk jet power to the circumgalactic medium. The fraction of jet power deposited as heat in the :term:`CGM` is set by the ``[efficiencyRadioMode]`` parameter.

**(Default implementation)**

**Parameters**

* ``[efficiencyRadioMode]`` (default ``1.0d0``) — Efficiency with which radio-mode feedback is coupled to the :term:`CGM`.

.. _physics-blackHoleCGMHeatingQuasistatic:

``blackHoleCGMHeatingQuasistatic``
----------------------------------

A black hole CGM heating class that models quasi-static AGN feedback, in which the rate of energy deposited into the circumgalactic medium depends on how closely the :term:`CGM` is in hydrostatic equilibrium. The overall coupling efficiency is controlled by the ``[efficiencyHeating]`` parameter.

**Parameters**

* ``[efficiencyHeating]`` (default ``1.0d-3``) — The efficiency with which accretion onto a black hole heats the :term:`CGM`.