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Visual–IR Color Gradients in Elliptical Galaxies

Published online by Cambridge University Press:  04 August 2017

R. F. Peletier
Affiliation:
Kapteyn Astronomical Institute, Groningen, the Netherlands
E. A. Valentijn
Affiliation:
Kapteyn Astronomical Institute, Groningen, the Netherlands
R. F. Jameson
Affiliation:
Department of Astronomy, University of Leicester, United Kingdom

Extract

Dissipational formation theories (e.g. Larson 1974) predict a metallicity change with distance from the center in elliptical galaxies. Several authors have reported small color gradients in visual colors like B–V and B–R. The interpretation of these data is not easy, due to uncertainties caused by the short wavelength–baseline, and by the presence of a hot stellar population suggested by IUE–data (e.g. Burstein et al. 1986). Simultaneous measurements of visual and visual-infrared colors provide the means to determine both the average temperature of the giant branch and the turnoff–temperature of the main sequence. This allows to model fractional contributions of different populations, including age– and metallicity–effects. The required continuity of solutions at different radii provides a strong constraint in selecting a more unique overall population model, and relieves the ambiguous interpretation of single measurements.

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Posters
Copyright
Copyright © Reidel 1987 

References

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