Computer Science
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sgyu.conf...33t&link_type=abstract
Studies of Galaxies in the Young Universe with New Generation Telescope, Proceedings of Japan-German Seminar, held in Sendai, Ja
Computer Science
Scientific paper
Stellar populations in an elliptical galaxy are not uniform. Colors in a galaxy become bluer with an increasing radius. Such a radial gradient of color has been naively assumed to originate from a metallicity variation inside a galaxy. However, this interpretation is premature because stellar populations of either higher metallicity or older age can make the galaxy redder. This problem, which is called the age-metallicity degeneracy, must be solved to know the origin of the gradients observed in elliptical galaxies. An evolution of a color gradient is a key to break the degeneracy, because the evolution of the gradient caused by a metallicity gradient is predicted to be different from that by an age gradient. Here, the model color gradients were constructed using a population synthesis model so as to reproduce color gradients in local ellipticals either by a metallicity gradient or by an age gradient, and the predicted evolutions were compared with the color gradient observed in the distant ellipticals in the HDF-N. Since the HDF-N is considered to represent field environment, we extended our study to cluster ellipticals using the HST archival deep imaging data of the distant clusters at redshifts from 0.37 to 0.56. Our studies indicate that the primary origin of the color gradients in an elliptical galaxy is not an age but a stellar metallicity, and this result does not depend on galaxy environment.
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