Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.206..453e&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 206, Jan. 15, 1984, p. 453-464. Research supported by t
Astronomy and Astrophysics
Astronomy
43
Elliptical Galaxies, Galactic Structure, Mass To Light Ratios, Multivariate Statistical Analysis, Data Sampling, Metallicity, Monte Carlo Method, Stellar Mass, Variable Stars, Velocity Distribution
Scientific paper
Principal components are used to investigate the properties of elliptical galaxies in the space of absolute magnitude, central velocity dispersion and central line strength. The analysis shows that elliptical galaxies are at least a two-parameter family and that, to a useful approximation, the data points define a plane in this space. It is found that axial ratio is not correlated with the plane and therefore cannot be used to estimate the true shapes of elliptical galaxies. The correlation between mass-to-light ratio and the plane is highly significant, which may indicate that the stellar mass functions of elliptical galaxies are affected by their metallicities or by the depths of their potential wells. By minimizing residuals in the relation between absolute magnitude and velocity dispersion, a Virgocentric infall velocity of 230 + or - 60 km/sec is found. Similar results are obtained when line strengths are included in the fits but the uncertainty is not reduced because the slope of the corrected relation is shallower.
Efstathiou George
Fall Michael S.
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