SciPy

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.

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