Light Profiles

Standard [ag.lp]

Standard parametric light profiles whose intensity is a free parameter of the model.

Gaussian	The elliptical Gaussian light profile.
GaussianSph	The spherical Gaussian light profile.
GaussianMultipole	The elliptical Gaussian light profile with m=3 and m=4 Fourier multipole perturbations on the eccentric radius.
Sersic	The elliptical Sersic light profile.
SersicSph	The spherical Sersic light profile.
SersicMultipole	The elliptical Sersic light profile with m=3 and m=4 Fourier multipole perturbations on the eccentric radius.
Exponential	The elliptical exponential profile.
ExponentialSph	The spherical exponential profile.
DevVaucouleurs	The elliptical Dev Vaucouleurs light profile.
DevVaucouleursSph	The spherical Dev Vaucouleurs light profile.
SersicCore	The elliptical cored-Sersic light profile.
SersicCoreSph	The elliptical cored-Sersic light profile.
ExponentialCore	The elliptical cored-Exponential light profile.
ExponentialCoreSph	The elliptical cored-Exponential light profile.
Chameleon	The elliptical Chameleon light profile.
ChameleonSph	The spherical Chameleon light profile.
ElsonFreeFall	The elliptical Elson, Fall and Freeman (EFF) light profile, which is commonly used to represent the clumps of Lyman-alpha emitter galaxies (see https://arxiv.org/abs/1708.08854).
ElsonFreeFallSph	The spherical Elson, Fall and Freeman (EFF) light profile, which is commonly used to represent the clumps of Lyman-alpha emitter galaxies (see https://arxiv.org/abs/1708.08854).

Linear [ag.lp_linear]

Linear light profiles whose intensity is not a free parameter but is instead solved analytically via a linear matrix inversion during each likelihood evaluation. This allows many profiles to be combined efficiently without exploding the non-linear parameter space.

Gaussian	The elliptical Gaussian light profile.
GaussianSph	The spherical Gaussian light profile.
GaussianMultipole	The linear elliptical Gaussian light profile with m=3 and m=4 Fourier multipole perturbations on the eccentric radius.
Sersic	The elliptical Sersic light profile.
SersicSph	The spherical Sersic light profile.
SersicMultipole	The linear elliptical Sersic light profile with m=3 and m=4 Fourier multipole perturbations on the eccentric radius.
Exponential	The elliptical Exponential light profile.
ExponentialSph	The spherical Exponential light profile.
DevVaucouleurs	The elliptical DevVaucouleurs light profile.
DevVaucouleursSph	The spherical DevVaucouleurs light profile.
SersicCore	The elliptical cored-Sersic light profile.
SersicCoreSph	The spherical cored-Sersic light profile.
ExponentialCore	The elliptical cored-Exponential light profile.
ExponentialCoreSph	The spherical cored-Exponential light profile.

Operated [ag.lp_operated]

Operated light profiles that represent emission which has already had an instrument operation (e.g. PSF convolution) applied to it. The operated_only parameter on fitting classes controls whether these profiles are included or excluded from a given image computation.

Gaussian	The elliptical Gaussian light profile.
Moffat	The elliptical Moffat light profile, which is commonly used to model the Point Spread Function of Astronomy observations.
Sersic	The elliptical Sersic light profile.

Basis [ag.lp_basis]

A Basis groups a collection of light profiles (e.g. a Multi-Gaussian Expansion or shapelet decomposition) so that they behave as a single profile in the model. When the constituent profiles are LightProfileLinear instances their intensities are all solved simultaneously via a single inversion.

Basis

A basis is a collection of multiple light or mass profiles that are used to represent the light or mass distribution of a galaxy.