Reconstructing the Last Major Merger of the Milky Way with the H3 Survey

z=0 snapshot of stellar debris from the Gaia-Sausage-Enceladus merger. Each row in this file represents a single 104 Msun star particle. The Galactocentric frame is tied to the center of mass of the Milky Way bulge in the simulation. Heliocentric coordinates are derived from the Galactocentric coordinates assuming the Astropy v4.1 solar position and velocity. Note that this file contains all the particles, not just the ones occurring within the H3 Survey footprint. No measurement errors have been applied. Column descriptions follow. X, Y, Z — Galactocentric Cartesian positions [kpc] Vx, Vy, Vz — Galactocentric Cartesian velocities [kpc] Vr, Vtheta, Vphi — Galactocentric spherical velocities [km s-1] E_tot — Total orbital energy [105 km s-2] Lz — z-component of angular momentum [103 kpc km s-1] ra, dec — Right Ascension, Declination [degree] L, B — Galactic longitude, Galactic latitude [degree] rv — Heliocentric radial velocity [km s-1] pm_ra, pm_dec — Proper motion in RA*cos(DEC), Proper motion in DEC [mas yr-1] pm_ra_reflexcorr, pm_dec_reflexcorr — Proper motions corrected for solar reflex [mas yr-1]