Intermediate-velocity clouds approaching the galactic plane

Based on their negative velocities and the orientations of their cometary tails, many intermediate-velocity clouds (IVCs) appear to be falling into the Milky Ways disk. In order to investigate the past and future evolution of these clouds, we have performed a suite of hydrodynamical simulations, two of which are presented here. Our simulations are designed to model IVC 86-36 in the Pegasus-Pisces Arch. In all of the simulations, the clouds develop long tails as they pass through the low-density thick disk and dissipate when they enter the higher density gas within 300 pc of the midplane.