GalSim: The modular galaxy image simulation toolkit
  GALSIM is a collaborative, open-source project aimed at providing an image
simulation tool of enduring benefit to the astronomical community. It provides
a software library for generating images of astronomical objects such as stars
and galaxies in a variety of ways, efficiently handling image transformations
and operations such as convolution and rendering at high precision. We describe
the GALSIM software and its capabilities, including necessary theoretical
background. We demonstrate that the performance of GALSIM meets the stringent
requirements of high precision image analysis applications such as weak
gravitational lensing, for current datasets and for the Stage IV dark energy
surveys of the Large Synoptic Survey Telescope, ESA's Euclid mission, and
NASA's WFIRST-AFTA mission. The GALSIM project repository is public and
includes the full code history, all open and closed issues, installation
instructions, documentation, and wiki pages (including a Frequently Asked
Questions section). The GALSIM repository can be found at
https://github.com/GalSim-developers/GalSim .
