.. _physics-circumgalacticMediumHeating:

Circumgalactic Medium Heating
=============================

Class providing models of the heating rate (in :math:`\mathrm{M}_\odot` km\ :math:`^2` s\ :math:`^{-1}`) deposited into the :term:`CGM`. This may include contributions from AGN feedback, for example. The :term:`CGM` heating rate directly affects the cooling rate and hence the gas supply available for star formation in the central galaxy.

**Default implementation:** ``circumgalacticMediumHeatingZero``

Methods
-------

``heatingRate`` → ``double precision``
   Compute the heating rate of the CGM [in units of :math:`\mathrm{M}_\odot \mathrm{km}^2\mathrm{s}^{-1}`].

   * ``type(treeNode), intent(inout) :: node``

.. _physics-circumgalacticMediumHeatingAGNFeedback:

``circumgalacticMediumHeatingAGNFeedback``
------------------------------------------

A circumgalactic medium heating class that computes heating from AGN feedback, coupling the energy output of active galactic nuclei to the hot gas halo. This class delegates to a black hole CGM heating implementation to determine the heating rate.

.. _physics-circumgalacticMediumHeatingSummation:

``circumgalacticMediumHeatingSummation``
----------------------------------------

A circumgalactic medium heating class that computes the total CGM heating rate as the sum of contributions from a list of other heating rate classes. This allows multiple heating mechanisms (e.g. AGN feedback, stellar feedback) to be combined additively.

**Methods**

* ``list`` — Return a list of all sub-components.

.. _physics-circumgalacticMediumHeatingZero:

``circumgalacticMediumHeatingZero``
-----------------------------------

A null implementation of the circumgalactic medium heating class that returns zero heating rate at all times. Useful for disabling :term:`CGM` heating while testing other physical processes or for models in which feedback heating of the hot gas halo is neglected.

**(Default implementation)**