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Simulated wide-field images are becoming an important part of observationalastronomy, either to prepare for new surveys or to test measurement methods. Inorder to efficiently explore vast parameter spaces, the computational speed ofsimulation codes is a central requirement to their implementation. We introducethe Ultra Fast Image Generator (UFig) which aims to bring wide-field imagingsimulations to the current limits of computational capabilities. We achievethis goal through: (1) models of galaxies, stars and observational conditions,which, while simple, capture the key features necessary for realisticsimulations, and (2) state-of-the-art computational and implementationoptimizations. We present the performances of UFig and show that it is fasterthan existing public simulation codes by several orders of magnitude. It allowsus to produce images more quickly than SExtractor needs to analyze them. Forinstance, it can simulate a typical 0.25 deg^2 Subaru SuprimeCam image (10k x8k pixels) with a 5-sigma limiting magnitude of R=26 in 30 seconds on a laptop,yielding an average simulation time for a galaxy of 30 microseconds. This codeis complementary to end-to-end simulation codes and can be used as a fast,central component of observational methods relying on simulations.

An Ultra Fast Image Generator (UFig) for wide-field astronomy