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        Origin of color gradients in elliptical galaxies

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        Kodama1.pdf (PDF, 531Kb)
        Author
        Tamura, N
        Kobayashi, Chiaki
        Arimoto, N
        Ohta, K
        Kodama, Tadayuki
        Attention
        2299/7298
        Abstract
        The origin of color gradients in elliptical galaxies is examined by comparing model gradients with those observed in the Hubble Deep Field. The models are constructed so as to reproduce color gradients in local elliptical galaxies either by a metallicity gradient or by an age gradient. By looking-back a sequence of the color gradient as a function of redshift, the age-metallicity degeneracy is solved. The observed color gradients in elliptical galaxies at z = 0.1 to 1.0 agree excellently with those predicted by the metallicity gradient, while they deviate significantly from those predicted by the age gradient even at z similar to 0.3, and the deviation becomes larger with increasing redshift. This result does not depend on cosmological parameters and parameters for an evolutionary model of an elliptical galaxy within a reasonable range. Thus our results clearly indicate that the origin of color gradients is not age but stellar metallicity.
        Publication date
        2000-05
        Published in
        The Astronomical Journal
        Published version
        https://doi.org/10.1086/301333
        Other links
        http://hdl.handle.net/2299/7298
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