py21cmmc.likelihood.LikelihoodGreig.__init__#
- LikelihoodGreig.__init__(*args, **kwargs)[source]#
Neutral fraction likelihood/prior.
Note that the default parameters are based on McGreer et al. constraints Modelled as a flat, unity prior at x_HI <= 0.06, and a one sided Gaussian at x_HI > 0.06 (Gaussian of mean 0.06 and one sigma of 0.05).
Limit on the IGM neutral fraction at z = 5.9, from dark pixels by I. McGreer et al. (2015) (http://adsabs.harvard.edu/abs/2015MNRAS.447..499M)
- Parameters:
redshift (float or list of floats) – Redshift(s) at which the neutral fraction has been measured.
xHI (float or list of floats) – Measured values of the neutral fraction, corresponding to redshift.
xHI_sigma (float or list of floats) – One-sided uncertainty of measurements.