LightClump
- class dysmalpy.models.LightClump(tracer=None, **kwargs)[source]
Bases:
LightModel,_DysmalFittable3DModelLight distribution for a clump following a Sersic profile, at a given galaxy midplane R and azimuthal angle phi.
- Parameters:
r_center (float) – Radial distance from galaxy center to clump center, in the galaxy midplane, in kpc
phi (float) – Azimuthal angle of clump, counter-clockwise from blue major axis. In degrees.
theta (float) – Polar angle of clump, from the +z direction. In degrees.
L_tot (float) – Total luminsoity of clump. Arbitrary units.
r_eff (float) – Effective (half-light) radius of clump in kpc
n (float) – Sersic index of clump
tracer (string) – (Attribute): Name of the dynamical tracer
Notes
Model formula:
\[I(r) = I_e \exp \left\{ -b_n \left[ \left( \frac{r}{r_{\mathrm{eff}}} \right)^{1/n} -1 \right] \right\}\]The constant \(b_n\) is defined such that \(r_{\mathrm{eff}}\) contains half the total light, and can be solved for numerically.
\[\Gamma(2n) = 2\gamma (b_n,2n)\]Attributes Summary
Names of the parameters that describe models of this type.
Methods Summary
evaluate(x, y, z, L_tot, r_eff, n, r_center, ...)Light profile of the clump
light_profile(x, y, z)Light profile of the clump
Attributes Documentation
- L_tot = DysmalParameter('L_tot', value=1.0, bounds=(0, 50), prior=<dysmalpy.parameters.UniformPrior object>)
- n = DysmalParameter('n', value=1.0, bounds=(0, 8), prior=<dysmalpy.parameters.UniformPrior object>)
- param_names = ('L_tot', 'r_eff', 'n', 'r_center', 'phi', 'theta')
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
Parameterattributes defined in the class body.
- phi = DysmalParameter('phi', value=0.0, bounds=(0, 360), prior=<dysmalpy.parameters.UniformPrior object>)
- r_center = DysmalParameter('r_center', value=0.0, bounds=(0, 30), prior=<dysmalpy.parameters.UniformPrior object>)
- r_eff = DysmalParameter('r_eff', value=1.0, bounds=(0, 50), prior=<dysmalpy.parameters.UniformPrior object>)
- theta = DysmalParameter('theta', value=90.0, bounds=(0, 180), prior=<dysmalpy.parameters.UniformPrior object>)
Methods Documentation