A&A 432, 937-953 (2005)
Effelsberg H I observations of compact high-velocity cloudsT. Westmeier, C. Brüns and J. Kerp
Radioastronomisches Institut der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
(Received 6 May 2004 / Accepted 24 November 2004)
We have mapped 11 compact high-velocity clouds (CHVCs) in the 21-cm line emission of neutral, atomic hydrogen, using the Effelsberg 100-m radio telescope. The aim of our observations was to study the overall distribution of the warm neutral medium of CHVCs with high sensitivity. The achieved baseline rms of at the original velocity resolution allows us to search for evidence of ram-pressure interaction with the ambient medium. In addition, we have obtained spectra along an appropriate axis across each CHVC with longer integration times and denser angular sampling. These deep slices with allow us to determine the column density profile in greater detail as well as the velocity and line width gradient across each cloud.
Key words: ISM: clouds -- Galaxy: halo -- Galaxy: evolution -- galaxies: Local Group -- galaxies: ISM
© ESO 2005