Statistics – Computation
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342..122k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 1, 1989, p. 122-127.
Statistics
Computation
12
Astronomical Photometry, Computational Astrophysics, Elliptical Galaxies, Spiral Galaxies, Virgo Galactic Cluster, Brightness Distribution, Correlation Coefficients, Eigenvectors, Galactic Structure, Line Spectra
Scientific paper
The interrelations between the surface photometric parameters and the internal velocities are explored by means of the principal component analysis and the regression line analysis of homogeneous data for 18 elliptical and 28 spiral galaxies of moderate inclinations in the Virgo Cluster. Extremely tight correlations are found both for ellipticals and spirals, between the visual magnitude and a combined parameter involving the internal velocity and the isophotal diameter of galaxies. The physical meaning of the parameter is inferred to be a sort of phase-space density related to the basic structure of galaxies, and its empirical behavior in the diameter versus surface brightness diagram is briefly described.
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