opz_evolution

zdm.cosmology.opz_evolution(z, *params)

Simple power-law source evolution model.

Computes (1+z)^(2.7*n), which matches the low-z behavior of the SFR model but lacks the high-z turnover. The factor 2.7 ensures that n-values are comparable between models.

Parameters:

• z (float or array_like) – Redshift.

• *params (float) – First parameter is n, the evolution power parameter.

Returns:

Relative source density at redshift z.

Return type:

float or ndarray