Volume 563, March 2014
|Number of page(s)||10|
|Section||Interstellar and circumstellar matter|
|Published online||17 March 2014|
H I observations of three compact high-velocity clouds around the Milky Way
1 Argelander-Institut für Astronomie, Auf dem Hügel 71, 53121 Bonn, Germany
2 International Centre for Radio Astronomy Research (ICRAR), The University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia
Received: 12 September 2013
Accepted: 15 January 2014
Context. We present deep H i observations of three compact high-velocity clouds (CHVCs).
Aims. 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.
Methods. 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.
Results. 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.
Key words: ISM: clouds / Galaxy: halo / galaxies: kinematics and dynamics / techniques: image processing
© ESO, 2014
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