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The hot, low density gas surrounding galaxies, called the circumgalactic medium (CGM), is vital to understanding the structure and evolution of galaxies (Tumlinson, Peeples, & Werk, 2017; Voit et al., 2017). The diffuse nature of the CGM makes it difficult to observe by direction detection in emission, so much of our understanding comes from studying absorption line features in the spectra of light from distant quasars that pass through intervening galaxies (Howk et al., 2017; Lehner et al., 2018). A single quasar sightline only contains information about a relatively small portion of gas in the halo of an individual galaxy. Because of this, observational astronomers conduct surveys to collect many sightlines and create large absorber catalogs that contain information about the variety of absorption lines found in each individual sightline. These catalogs create a statistical picture of the CGM and have proved invaluable in our understanding of the dynamics in the CGM.

SALSA: A Python Package for Constructing Synthetic Quasar Absorption Line Catalogs from Astrophysical Hydrodynamic Simulations