Cresting the wave: Proper motions of the Eastern Banded Structure
  We study the kinematic properties of the Eastern Banded Structure (EBS) and
Hydra I overdensity using exquisite proper motions derived from the Sloan
Digital Sky Survey (SDSS) and Gaia source catalog. Main sequence turn-off stars
in the vicinity of the EBS are identified from SDSS photometry; we use the
proper motions and, where applicable, spectroscopic measurements of these stars
to probe the kinematics of this apparent stream. We find that the EBS and Hydra
I share common kinematic and chemical properties with the nearby Monoceros
Ring. In particular, the proper motions of the EBS, like Monoceros, are
indicative of prograde rotation (V_phi ~ 180-220 km/s), which is similar to the
Galactic thick disc. The kinematic structure of stars in the vicinity of the
EBS suggest that it is not a distinct stellar stream, but rather marks the
"edge" of the Monoceros Ring. The EBS and Hydra I are the latest substructures
to be linked with Monoceros, leaving the Galactic anti-centre a mess of
interlinked overdensities which likely share a unified, Galactic disc origin.
