Bayesian fitting of multi-Gaussian expansion models to galaxy images

Understand

Fitting parameterized models to images of galaxies has become the standard for measuring galaxy morphology.

• This forward modelling technique allows one to account for the PSF to effectively study semi-resolved galaxies.
• However, using a specific parameterization for a galaxy's surface brightness profile can bias measurements if it is not an accurate representation.
• Furthermore, it can be difficult to assess systematic errors in parameterized profiles.