Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.234..957a&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 234, Oct. 15, 1988, p. 957-969.
Astronomy and Astrophysics
Astronomy
17
Galactic Clusters, Hydrogen Clouds, Intergalactic Media, Spiral Galaxies, Dwarf Galaxies, Galactic Evolution, H I Regions
Scientific paper
Westerbork observations are presented of the SW cloud region of the M81 group. The observations have revealed (1) a filament of length >37 kpc, (2) a compact H I cloud with interesting kinematic properties, and (3) a southern extension to the disc of M81. It appears most likely that the H I filament is tidal debris although it is unclear which of the three companion galaxies (if not all) is responsible for its formation. The most surprising result is the discovery of a compact H I cloud, rotating in the opposite sense from the H I filament. This cloud could be a dwarf galaxy which existed before the encounters or formed as a result of them. Alternatively, the cloud could be part of scattered tidal debris originating from NGC 2976, the dwarf companion to the south of M81.
Appleton Phil N.
van der Hulst J. M.
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