Vertical Structure and Kinematics of the Galactic Outer Disk
  We report measurements of parallax and proper motion for four 22 GHz water
maser sources as part of VERA Outer Rotation Curve project. All sources show
Galactic latitudes of $>$ 2$^{\circ}$ and Galactocentric distances of $>$ 11
kpc at the Galactic longitude range of 95$^{\circ}$ $< l <$ 126$^{\circ}$. The
sources trace the Galactic warp reaching to 200$\sim$400 pc, and indicate the
signature of the warp to 600 pc toward the north Galactic pole. The new results
along with previous results in the literature show the maximum height of the
Galactic warp is increased with Galactocentric distance. Also, we examined
velocities perpendicular to the disk for the sample, and found an oscillatory
behavior between the vertical velocities and Galactic heights. This behavior
suggests the existence of the bending (vertical density) waves, possibly
induced by a perturbing satellite (e.g. passage of the Sagittarius dwarf
galaxy).
