Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.188..219m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 188, July 1979, p. 219-227.
Astronomy and Astrophysics
Astronomy
20
Hydrogen Clouds, Intergalactic Media, Graphs (Charts), High Speed, Radio Telescopes
Scientific paper
Four fields surrounding nearby dwarf galaxies have been searched for 21-cm emission from intergalactic clouds of neutral hydrogen. The observations covered a velocity range of 2000 km/s to a detection limit of typically 0.12 K. High velocity clouds (HVCs) were discovered in three of the fields, and were studied in detail. In the fourth field no new HVCs were found, but several previously reported clouds were confirmed. Several of the HVCs lie at small projected distances from the dwarf galaxies, but there are large differences in velocity between the adjacent galaxies and HVCs, in the range of approximately 130 to 200 km/s. Furthermore the density of HVCs at small projected distances from the galaxies is no larger than the density in comparison fields remote from nearby galaxies. One of the HVCs shows rotation, and may be a galaxy of low surface-brightness in the Local Group.
Cohen Richard J.
Mirabel Felix I.
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