H I observations of three compact high-velocity clouds around the Milky Way
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...
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Published in | Astronomy and astrophysics (Berlin) Vol. 563; p. np |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
EDP Sciences
01.03.2014
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Subjects | |
Online Access | Get full text |
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Summary: | 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. |
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Bibliography: | ark:/67375/80W-V3G45L2B-Z publisher-ID:aa22654-13 bibcode:2014A%26A...563A..99F dkey:10.1051/0004-6361/201322654 istex:C8AA7481F15032879D5D913D8BF071A1609E1A36 e-mail: faridani@astro.uni-bonn.de ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0004-6361 1432-0746 |
DOI: | 10.1051/0004-6361/201322654 |