Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...448...70e&link_type=abstract
Astrophysical Journal v.448, p.70
Astronomy and Astrophysics
Astronomy
11
Galaxies: Elliptical And Lenticular, Cd, Galaxies: Ism, X-Rays: Galaxies
Scientific paper
We have extended our bivariate and multivariate statistical analysis of the Einstein sample of early-type galaxies (Fabbiano, Kim, & Trinchieri 1992; Eskridge, Fabbiano, & Kim 1995a, b) to include a consideration of the Κ-parameters defined by Bender, Burstein, & Faber (1992). The Κ-parameters are defined such that Κ1 scales with virial mass, Κ3 scales with inner M/L ratio, and Κ2 is perpendicular to both Κ1 and Κ3. The Κ1-Κ3 plane is essentially edge-on to the Bender et al. (1992) formulation of the fundamental plane, and the parameter σΚ3 describes the scatter about that plane. We find that LB, Lx, and L6 are all strongly correlated with Κ1. Partial Spearman rank analysis shows these trends to be independent of the correlations between the luminosities. There are also significant bivariate trends of both Lx and L6 with Κ3. Partial Spearman rank analysis indicates that the Lx-Κ3 trend is the dominant one, thus arguing for a connection between the prominence of X-ray coronae and the inner M/L. This suggests that galaxies with central excesses of dark matter also have more massive extended dark matter halos, providing a mechanism for retaining larger amounts of hot interstellar medium. We find evidence for a correlation between Mg2 and σΚ3 that is independent of correlations of these two parameters with συ and is enhanced when tested for constant α4. The strengthening of the Mg2-σΚ3 correlation when tested for constant α4 indicates an underlying connection between the scatter about the fundamental plane and the Type II supernova enrichment history of the central regions of elliptical galaxies that is independent of the details of the central structure of individual galaxies. This suggests that the Mg2-σΚ3 trend is not related to the Mg2 enhancements associated with kinematically decoupled cores seen in some disky elliptical galaxies (e.g., Bender & Surma 1992). It may be that systems with higher inner M/Le (at a given mass) were more able to retain the metals generated in early epochs of star formation. Alternatively, systems experiencing more active or prolonged star formation may have produced an excess of baryonic dark matter from stellar remnants that is reflected in their higher M/Le.
Eskridge Paul B.
Fabbiano Giuseppina
Kim Dong-Woo
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