PetroFit: A Python Package for Computing Petrosian Radii and Fitting
  Galaxy Light Profiles
  PetroFit is an open-source Python package, based on Astropy and Photutils,
that can calculate Petrosian profiles and fit galaxy images. It offers
end-to-end tools for making accurate photometric measurements, estimating
morphological properties, and fitting 2D models to galaxy images. Petrosian
metric radii can be used for model parameter estimation and aperture photometry
to provide accurate total fluxes. Correction tools are provided for improving
Petrosian radii estimates affected by galaxy morphology. PetroFit also provides
tools for sampling Astropy-based models (including custom profiles and
multi-component models) onto image grids and enables PSF convolution to account
for the effects of seeing. These capabilities provide a robust means of
modeling and fitting galaxy light profiles. We have made the PetroFit package
publicly available on GitHub (PetroFit/petrofit) and PyPi (pip install
petrofit).
