Correlations between UBV colors and fine structure in E and S0 galaxies - A first attempt at dating ancient merger events

Details Correlations between UBV colors and fine structure in E and S0 galaxies - A first attempt at dating ancient merger events Correlations between UBV colors and fine structure in E and S0 galaxies - A first attempt at dating ancient merger events

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104.1039s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 104, no. 3, Sept. 1992, p. 1039-1067.

Astronomy and Astrophysics

Astronomy

335

Data Correlation, Fine Structure, Interacting Galaxies, Luminosity, Spiral Galaxies, Ubv Spectra, Astronomical Models, Color-Magnitude Diagram, H Beta Line

Scientific paper

New high-quality UBV colors of E and S0 galaxies compiled in the RC3 are analyzed, and correlations between them and the fine-structure index Sigma are explored. The color residuals Delta(U-B)e,0, Delta(B-V)e,0, and Delta(U-V)e,0 (where e refers to the effective or half-light aperture) correlate with Sigma for 35 E and 34 S0 galaxies both separately and combined. Typical coefficients are -0.4 to -0.6, and the slopes of the mean relations are significant at the 2.1 sigma-4.2 sigma level. The new correlations show that the detected systematic variations are not limited to the nuclei, but occur globally in the stellar populations of E and S0 galaxies. The color residuals and previously determined line-strength residuals correlate closely, demonstrating that it is cosmic scatter that dominates the vertical scatter in the color-magnitude and line-strength-magnitude relations. It is suggested that the deviations in color and line strength from mean relations have a common physical cause which, because of the correlations with fine structure, is probably a variation in the mean age of the stellar populations.

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