Disk-like Chemistry of the Triangulum-Andromeda Overdensity as Seen by APOGEE
Christian R. Hayes et al 2018 ApJL 859 L8
Chemical analysis of the Triangulum-Andromeda (TriAnd) system — a low-latitude Milky Way overdensity — suggest that it’s associated with the galactic disk, and, therefore, that the disk extends out beyond 24 kpc.