<scp>SynthPop</scp>: A New Framework for Synthetic Milky Way Population Generation

Abstract We present SynthPop , a new open source, modular population synthesis Galactic modeling software to simulate catalogs of Milky Way stars along any sightline outward from the Sun. Motivated by a lack of flexibility in existing Galactic models, SynthPop is coded entirely in python, can be run standalone or as an imported module, and is configured by json files that allow different model components to be switched out as desired. We describe the modular code structure, how the population generation process runs, and how to use the code. We also present model validation testing and known inaccuracies and present an example of the code use, comparing Gaia data and the Gaia Universe Model Snapshot to a SynthPop implementation. The code is available now via GitHub with ReadTheDocs documentation and can be installed via pip.