darkhistory.physics.photo_ion_rate¶
-
darkhistory.physics.
photo_ion_rate
(rs, eng, xH, xe, atom=None)¶ Photoionization rate in cm-3 s-1.
Parameters: - rs : float
Redshift (1+z).
- eng : ndarray
Energies to evaluate the cross section.
- xH : float
Ionization fraction nH+/nH.
- xe : float
Ionization fraction ne/nH = nH+/nH + nHe+/nH.
- atom : {None,’HI’,’HeI’,’HeII’}, optional
Determines which photoionization rate is returned. The default value is
None
, which returns the total rate.
Returns: - float
The photoionization rate of the particular species or the total ionization rate.