期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 368, 期 1, 页码 211-220出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2006.10144.x
关键词
methods : data analysis; galaxies : fundamental parameters; galaxies : photometry
We investigate the behaviour of the asymmetry parameter A as a morphological parameter using a 'volume-limited' sample of 349 galaxies (distance <= 25 Mpc, M-V <= -18.5 mag) and a larger magnitude-limited sample of 707 nearby galaxies. We confirm the correlation of A with morphological type. The late-type galaxies (Sdm, Sm and Im) have larger A than early-type galaxies, and they tend to have larger A than spiral galaxies. We investigate the usefulness of the A versus concentration index C-in diagram as a tool for the regular-irregular and early late classification. The diagram is not very useful to the regular versus late-type irregular classification, as inferred previously, but it is found to be useful to the early-late classification.
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