Timing the Early Assembly of the Milky Way with the H3 Survey

The archeological record of stars in the Milky Way opens a uniquely detailed window into the early formation and assembly of galaxies. Here we use 11,000 main-sequence turn-off stars with well-measured ages, [Fe/H],[alpha/Fe], and orbits from the H3 Survey and Gaia to time the major events in the early Galaxy. Located beyond the Galactic plane, 1 less than or similar to vertical bar Z vertical bar/kpc less than or similar to 4, this sample contains three chemically distinct groups: a low-metallicity population, and low-alpha and high-alpha groups at higher metallicity. The age and orbit distributions of these populations show that (1) the high-alpha group, which includes both disk stars and the in situ halo, has a star formation history independent of eccentricity that abruptly truncated 8.3 +/- 0.1 Gyr ago (z similar or equal to 1); (2) the low-metallicity population, which we identify as the accreted stellar halo, is on eccentric orbits and its star formation truncated 10.2.(+0.2)(-0.1) Gyr ago (z similar or equal to 2); (3) the low-alpha population is primarily on low-eccentricity orbits and the bulk of its stars formed less than 8 Gyr ago. These results suggest a scenario in which the Milky Way accreted a satellite galaxy at z approximate to 2 that merged with the early disk by z approximate to 1. This merger truncated star formation in the early high-alpha disk and perturbed a fraction of that disk onto halo-like orbits. The merger enabled the formation of a chemically distinct, low-alpha disk at z less than or similar to 1. The lack of any stars on halo-like orbits at younger ages indicates that this event was the last significant disturbance to the Milky Way disk.