scale_factor

astropy.cosmology.scale_factor(*args, **kwargs)

Deprecated since version 0.4: The scale_factor function is deprecated and may be removed in a future version. Use <Cosmology object>.scale_factor instead.

Scale factor at redshift z.

The scale factor is defined as a = 1 / (1 + z).

Parameters:

z : array_like

Input redshifts.

Returns:

scalefac : ndarray, or float if input scalar

Scale factor at each input redshift.