Gaia DR2 Probabilistic Action Catalog

The catalog has been checked for some consistency but has not been thoroughly
vetted, so please contact Gus Beane (abeane@sas.upenn.edu) if you run into
anything strange. There are 256 samples available for each star with a radial velocity and positive parallax in Gaia DR2.

The code used to generate this catalog is available at:
https://github.com/gusbeane/actcat . Mostly in the file gen_catalog.py.

Units:
actions - kpc km/s
angles - rad
freqs - km/s/kpc
positions - kpc
velocities - km/s

The catalog is stored in data/ as a series of ~400 hdf5 files. An example
script for reading the files is given in example_read.py

The following keys are available, where N is the number of stars in the file:

actions                 (N, 256, 3) - samples of the actions (in R, phi, z order)
actions_central         (N, 3) - actions computed using the central ra,dec,pm,etc.
angles                  (N, 256, 3) - samples of the angles (in R, phi, z order)
angles_central          (N, 3) - angles computed using the central ra,dec,pm,etc.
freqs                   (N, 256, 3) - samples of the freqs (in R, phi, z order)
freqs_central           (N, 3) - freqs computed using the central ra,dec,pm,etc.
posvel                  (N, 256, 6) - samples in position, velocity space (x,y,z,vx,vy,vz)
source_id               (N,) - Gaia DR2 source id for each star