Mathematics – Logic
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...280....7o&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 280, May 1, 1984, p. 7-14.
Mathematics
Logic
54
Astronomical Photometry, Brightness Distribution, Galactic Clusters, Data Correlation, Luminosity
Scientific paper
Analysis of the luminosity distribution of 261 galaxies in a homogeneous sample shows that a variety of luminosity profiles can be sequentially characterized by a single parameter related to the central concentration of luminosity, the mean concentration index. A good correlation is found between the index and the morphological type, although the scatter is relatively large. A source of the scatter, variation of the intrinsic surface brightness, is investigated using empirical models. It is suggested that the index when combined with the mean surface brightness, is sensitive to the bulge-to-disk ratio of a galaxy. The mean concentration index versus surface brightness diagram may provide a useful tool to investigate the luminosity structure of a galaxy and to characterize galaxy content of clusters of galaxies out to ˜100 Mpc.
Kodaira Keichi
Okamura Sadanori
Watanabe Makoto
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