galpy is a Python package for galactic dynamics. It supports orbit integration in a variety of potentials, evaluating and sampling various distribution functions, and the calculation of action-angle coordinates for all static potentials.
galpy is an astropy affiliated package and provides full support for astropy’s Quantity framework for variables with units.
Jo Bovy - bovy at astro dot utoronto dot ca
See AUTHORS.txt for a full list of contributors.
If you find this code useful in your research, please let me know. If you use galpy in a publication, please cite Bovy (2015) and link to http://github.com/jobovy/galpy. See the acknowledgement documentation section for a more detailed guide to citing parts of the code. Thanks!
If you are having issues with the installation of
galpy, please first
consult the Installation
galpy supports Python 3. Specifically, galpy supports Python 3.7,
3.8, and 3.9. It should also work on earlier Python 3.* versions, but
this is not extensively tested on an ongoing basis and because
galpy depends on are dropping earlier Python 3.*
galpy itself likely doesn't fully work on them. GitHub
Actions CI builds regularly check support for Python 3.9 (and of 3.7,
and 3.8 using a more limited, core set of tests) on Linux and Windows;
Appveyor builds regularly check support for Python 3.9 on
Windows. While most of
galpy likely works in Python 2.7, this is no
longer tested and Python 2.7 is no longer officially supported.
This package requires Numpy, Scipy, and Matplotlib. Certain advanced features require the GNU Scientific Library (GSL), with action calculations requiring version 1.14 or higher. Other optional dependencies include:
Orbit.from_nameinitialization method requires
Other parts of the code may require additional packages and you will be alerted by the code if they are not installed.
If you are interested in contributing to galpy\'s development, take a look at this brief guide on the wiki. This will hopefully help you get started!
Some further development notes can be found on the wiki. This includes a list of small and larger extensions of galpy that would be useful here as well as a longer-term roadmap here. Please let the main developer know if you need any help contributing!
The dehnendf and shudf disk distribution functions can be corrected to follow the desired surface-mass density and radial-velocity-dispersion profiles more closely (see 1999AJ....118.1201D). Calculating these corrections is expensive, and a large set of precalculated corrections can be found here [tar.gz archive]. Install these by downloading them and unpacking them into the galpy/df/data directory before running the setup.py installation. E.g.:
curl -O https://github.s3.amazonaws.com/downloads/jobovy/galpy/galpy-dfcorrections.tar.gz tar xvzf galpy-dfcorrections.tar.gz -C ./galpy/df/data/