Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...379l..45s&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 379, Oct. 1, 1991, p. L45-L47.
Astronomy and Astrophysics
Astrophysics
35
Dwarf Galaxies, Galactic Evolution, Galactic Structure, Star Clusters, Starburst Galaxies, Virgo Galactic Cluster
Scientific paper
Optical and radio data for the nucleated dwarf galaxy NGC 4286 show a mixed morphology between a star-forming Im type and a gas-poor dSO, N early-type dwarf. The Im dwarf NGC 3377A shows no gas depletion, but its morphology and size are similar to the 'huge, very low surface brightness' gas-poor galaxies recently identified in the Virgo cluster. The morphology of NGC 4286 is interpreted as an original Im system that has transformed itself (speciation along the dwarf sequence) into a gas-poor dSO, N by losing most (but not all) of its original gas through an internal supergalactic wind that was generated earlier by a superluminous star cluster. The remnant of this cluster has now sunk to the center by dynamical friction to form the observed unresolved bright nucleus. Such star clusters and superwinds are known to exist in many present-day starburst Sm and amorphous galaxies such as NGC 1569 and NGC 1705.
Hoffman Lyle G.
Sandage Allan
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