Mathematics
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phdt........44v&link_type=abstract
Ph.D. Thesis Michigan Univ., Ann Arbor.
Mathematics
Galactic Clusters, Galactic Evolution, Populations, Red Shift, Starburst Galaxies, Stars, Stellar Models, Mathematical Models, Stellar Color, Stellar Spectra, Stripping
Scientific paper
In order to substantiate the observation that the fraction of blue galaxies in the cores of dense clusters increases with redshift (the Butcher-Oemler effect), spectra were obtained for 61 galaxies in seven dense clusters over the redshift range 0.195 less than z less than 0.38. Results verified the effect at better than a 99.5 percent confidence level. Models for the evolution of the integrated spectra of stellar populations were constructed in order to ascertain the nature of the stellar populations within the observed galaxies. It is concluded that it is impossible to distinguish between two considered starburst models and the evolution of a stripped late-type galaxy using mean Balmer strength and B-V alone. The present models suggest that Dressler and Gunn's interpretation is not a unique explanation for previous observations. For galaxies having a larger bulge contribution, or for which stripping terminates star formation over a long timescale of approximately one billion years, the starburst scenario would be preferred. Also, it is possible to distinguish between the alternative evolutionary scenarios on the basis of comparisons between H beta and CaII H+K, the G band and the 4000 A break. Of all cluster galaxies observed, only one shows sufficiently strong Balmer absorption lines to be considered a starburst or stripped galaxy.
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