Source code for dust_extinction.conversions

from astropy.modeling import Fittable1DModel, Parameter

__all__ = ["AxAvToExv"]


[docs] class AxAvToExv(Fittable1DModel): """ Model to convert from A(x)/A(V) to E(x-V) Parameters ---------- Av : float dust column in A(V) [mag] """ Av = Parameter(description="A(V)", default=1.0, min=0.0)
[docs] @staticmethod def evaluate(axav, Av): """ AlAvToElv function Parameters ---------- axav : np array (float) E(x-V)/E(B-V) values Returns ------- exv : np array (float) E(x - V) """ return (axav - 1.0) * Av
# Removed 4 Sep 2019 as this code is never used due to this model # only is ever used in a compound model, hence the analytic derivatives # are never used. Code never used or tested, better to not have it. # The code is kept as a comment if in the future there is a need for it. # # @staticmethod # def fit_deriv(axav, Av): # """ # Derivatives of the AxAvtoElv function with respect to the parameters # """ # # derivatives # d_Av = axav - 1.0 # # return [d_Av]