S07_attenuation

class pahfit.component_models.S07_attenuation(tau_sil=1.0, **kwargs)

Bases: Fittable1DModel

Smith, Draine, et al. (2007) kvt attenuation model calculation. Calculation is for a fully mixed geometrically model. Uses an extinction curve based on the silicate profiles from Kemper, Vriend, & Tielens (2004, apJ, 609, 826). Constructed as a weighted sum of two components: silicate profiles, and an exponent 1.7 power-law.

Attenuation curve for a mixed case calculated from .. math:

Att(x) = \frac{1 - e^{-\tau_{x}}}{\tau_{x}}

Parameters:

kvt_ampfloat

amplitude

Attributes Summary

param_names	Names of the parameters that describe models of this type.
tau_sil

Methods Summary

evaluate(in_x, tau_si)	Evaluate the model on some input variables.
kvt(in_x)	Output the kvt extinction curve

Attributes Documentation

param_names = ('tau_sil',)

Names of the parameters that describe models of this type.

The parameters in this tuple are in the same order they should be passed in when initializing a model of a specific type. Some types of models, such as polynomial models, have a different number of parameters depending on some other property of the model, such as the degree.

When defining a custom model class the value of this attribute is automatically set by the Parameter attributes defined in the class body.

tau_sil = Parameter('tau_sil', value=1.0, bounds=(0.0, 10))

Methods Documentation

evaluate(in_x, tau_si)

Evaluate the model on some input variables.

static kvt(in_x)

Output the kvt extinction curve