HI observations of three compact high-velocity clouds around the Milky
  Way
  We present deep HI observations of three compact high-velocity clouds
(CHVCs). The main goal is to study their diffuse warm gas and compact cold
cores. We use both low- and high-resolution data obtained with the 100 m
Effelsberg telescope and the Westerbork Synthesis Radio Telescope (WSRT). The
combination is essential in order to study the morphological properties of the
clouds since the single-dish telescope lacks a sufficient angular resolution
while the interferometer misses a large portion of the diffuse gas. Here
single-dish and interferometer data are combined in the image domain with a new
combination pipeline. The combination makes it possible to examine interactions
between the clouds and their surrounding environment in great detail. The
apparent difference between single-dish and radio interferometer total flux
densities shows that the CHVCs contain a considerable amount of diffuse gas
with low brightness temperatures. A Gaussian decomposition indicates that the
clouds consist predominantly of warm gas.
