.. _physics-starFormationRateSpheroids:

Star Formation Rates in Spheroids
=================================

Class providing models of the star formation rate (in :math:`\mathrm{M}_\odot` Gyr\ :math:`^{-1}`) in the spheroid (bulge) component of a galaxy. Star formation in spheroids is typically triggered by galaxy mergers or disk instabilities that funnel gas into the galactic center. Implementations commonly adopt a timescale approach in which the star formation rate is proportional to the available cold gas mass divided by a dynamical or depletion timescale.

**Default implementation:** ``starFormationRateSpheroidsTimescale``

Methods
-------

``rate`` → ``double precision``
   Returns the rate (in units of :math:`\mathrm{M}_\odot` Gyr\ :math:`^{-1}`) for star formation in the spheroid component of ``node``.

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

.. _physics-starFormationRateSpheroidsCentralsOnly:

``starFormationRateSpheroidsCentralsOnly``
------------------------------------------

A star formation rate in galactic spheroids which sets rates in satellites to zero.

.. _physics-starFormationRateSpheroidsTimescale:

``starFormationRateSpheroidsTimescale``
---------------------------------------

A star formation rate in galactic spheroids which computes the rate by integrating a star formation rate over the spheroid.

**(Default implementation)**