Tracer#

`Galaxy`	Class representing a galaxy, which is composed of attributes used for fitting hyper_galaxies (e.g.
`Plane`	A plane of galaxies where all galaxies are at the same redshift.
`Tracer`	Ray-tracer for a lens system with any number of planes.
`SettingsLens`

To treat the redshift of a galaxy as a free parameter in a model, the Redshift object must be used.

This is because PyAutoFit (which handles model-fitting), requires all parameters to be a Python class.

The Redshift object does not need to be used for general PyAutoGalaxy use.

Class used when assigning a redshift to a Galaxy object.

By using a HyperGalaxy, the noise-map value in the regions of the image that the galaxy is located are increased.

This prevents over-fitting regions of the data where the model does not provide a good fit (e.g. where a high chi-squared is inferred).

By using a HyperGalaxy, the noise-map value in the regions of the image that the galaxy is located are increased.