Arm Structure in Normal Spiral Galaxies. II. Multivariate Statistical Analysis

Details Arm Structure in Normal Spiral Galaxies. II. Multivariate Statistical Analysis Arm Structure in Normal Spiral Galaxies. II. Multivariate Statistical Analysis

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110.1614m&link_type=abstract

Astronomical Journal v.110, p.1614

Astronomy and Astrophysics

Astronomy

3

Galaxies: Spiral, Galaxies: Fundamental Parameters, Galaxies: Structure

Scientific paper

Multivariate data on a sample of 492 moderately bright (B_T_ <= 13.2) northern Sa, SBa, Sc, and SBc spiral galaxies have been analyzed in an effort to develop a classification system which is not necessarily based on subjectively determined morphological properties. These data were subjected to univariate statistical tests and to principal components analysis, both modified so as to handle nondetections. Unbarred spiral galaxies have two fundamental properties, in accord with previous work. While "scale" (bulk) is most important, galaxies of given scale can vary in "form" (color, bulge/disk ratio, H I surface density). Neither scale nor form, however, serves as a good predictor of the subjective "nonrandomness" of the arm pattern.

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