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THE RELATIONSHIPS BETWEEN MORPHOLOGICAL TYPE AND QUANTITATIVE MEASURES IN THE CLUSTER ENVIRONMENT
GREGORY D. BOTHUN
Publications of the Astronomical Society of the Pacific
Vol. 94, No. 561 (October 1982), pp. 774-788
Published by: Astronomical Society of the Pacific
Stable URL: http://www.jstor.org/stable/40678037
Page Count: 15
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We investigate the relationships between morphological types in both the traditional Hubble-Sandage system as well as the recently developed RDDO system and quantitative measurements of the integrated properties for a sample of cluster spirals. Correlations are presented between morphological type and integrated color, integrated HI content, position in the color-gas content relation, and 20% velocity width. Similar correlations are presented as a function of visually estimated disk-to-bulge ratio (D/B). In general, while there are significant differences between these parameters in the mean as a function of morphological type, the scatter within morphological class is large and the overlap between various types is conspicuous. However, these same differences are also a strong function of D/B. Kennicutt (1981) has shown that the correlation between D/B (measured using Yerkes types) and morphological type (estimated using arm pitch angle) is weak at best. Thus, it may be that differences in integrated properties between galaxies hitherto attributed to morphological type differences are instead, stronger functions of D/B. Finally, with regard to reputed cluster-field differences, no significant bias is seen between color or gas-content as a function of morphological type for the cluster sample compared with any "field" sample. But we caution that morphological type should not be used as a fundamental parameter in ascertaining if there are any cluster-field differences because of the large scatter associated with correlations involving that parameter.
Publications of the Astronomical Society of the Pacific © 1982 The University of Chicago Press