p_unseen_Marnoch

zdm.optical.p_unseen_Marnoch(zvals, plot=False)[source]

Return the probability that an FRB host galaxy is unseen in typical VLT observations.

Digitises Figure 3 of Marnoch et al. 2023 (MNRAS 525, 994), which shows p(U | z) — the cumulative probability that a host galaxy at redshift z falls below the VLT/FORS2 R-band detection limit. A cubic polynomial is fit to the digitised curve and evaluated at the requested redshifts. Values are clamped to [0, 1].

Parameters:

  • zvals (float or np.ndarray) – redshift(s) at which to evaluate p(U | z).

  • plot (bool) – if True, save a diagnostic comparison plot of the raw digitised data, linear interpolation, and polynomial fit to p_unseen.pdf. Defaults to False.

Returns:

p(U | z) evaluated at each element of zvals,

clamped to the range [0, 1].

Return type:

fitv (np.ndarray)