Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...306..390v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 306, July 15, 1986, p. 390-400.
Astronomy and Astrophysics
Astrophysics
46
Elliptical Galaxies, Galactic Clusters, Galactic Structure, Multivariate Statistical Analysis, Color-Magnitude Diagram, Correlation, Eigenvalues, Luminosity, Mass To Light Ratios, Principal Components Analysis, Virgo Galactic Cluster
Scientific paper
The relations between the structural, kinematic, and chemical properties of elliptical galaxies in different environments are studied, and it is found that, at a given luminosity or mass, Virgo ellipticals are more compact than Coma ellipticals. Given a universal M/L ratio, a relative Virgo-Coma distance modulus of 3.80 + or - 0.06 mag is derived, corresponding to an infall velocity of 205 + or - 40 km/s. The M/L ratio is significantly correlated with luminosity for both cluster and field ellipticals, and is proportional to L exp 0.3, though after correction for a possible systematic error in the RC2 radii, the power would increase from 0.3 to 0.5-0.6. A principal component analysis indicates that both cluster and field ellipticals are a two-parameter family in the L-sigma-Mg2 space, the second parameter being dominated by Mg2, and it is suggested that the residual scatter of Mg2 about the Mg2-L or Mg2-sigma fits is intrinsic.
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