ForegroundExponentialExtinction

class dysmalpy.models.ForegroundExponentialExtinction(Alam0=0.0, rd=1.0, **kwargs)

Bases: DustExtinction

Model for extinction due to a foreground plane of dust

Parameters:

• Alam0 (float) – Magnitude of attenuation of the dust plane (at the tracer wavelength) at the center.

• rd (float) – Scale-length of the dust attenuation exponential curve, in kpc

Notes

This model places a dust dust as a foreground screen before the entire cube, with an exponential profile in the midplane of the source geometry.

All positions that will have their flux reduced by \(A=10^{-0.4A_{\lambda}(r)}\), with

\[F = AF_{\rm intrinsic}\]

where \(A\) is between 0 and 1. Here \(A_{\lambda}(r)=A_{\lambda,0}e^{-r/rd}\), and \(r=\sqrt{x^2+y^2}\).

Attributes Summary

Alam0
param_names	Names of the parameters that describe models of this type.
rd

Methods Summary

attenuation_cube(x, y, z)	Evaluate the flux attenuation (linear multiplier) at all locations of the cube
evaluate(x, y, z, Alam0, rd)	Evaluate the model on some input variables.

Attributes Documentation

Alam0 = DysmalParameter('Alam0', value=0.0, bounds=(0.0, 10.0), prior=<dysmalpy.parameters.UniformPrior object>)

param_names = ('Alam0', 'rd')

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.

rd = DysmalParameter('rd', value=1.0, bounds=(0.0, 10.0), prior=<dysmalpy.parameters.UniformPrior object>)

Methods Documentation

attenuation_cube(x, y, z)

Evaluate the flux attenuation (linear multiplier) at all locations of the cube

static evaluate(x, y, z, Alam0, rd)

Evaluate the model on some input variables.