Spectra of galaxies in clusters. II - Models for the spectra of postburst and stripped galaxies

Astronomy and Astrophysics – Astrophysics

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Astronomical Spectroscopy, Balmer Series, Galactic Clusters, Galactic Evolution, Star Distribution, Starburst Galaxies, Absorption Spectra, Galactic Radiation, Spectrum Analysis, Star Formation Rate

Scientific paper

An investigation is conducted into the peculiar combination of mean Balmer absorption strengths of 7-8 A and relatively red color observed in the 'E+A' spectra of galaxies in 3C 295 and similar high-redshift rich clusters. Models are computed for the spectral evolution of early-type galaxies undergoing starbursts, as well as for a model of a late-type galaxy in which stripping halts star formation. Bursts having a constant star-formation rate of about 0.5 Gyr duration cannot be distinguished from the stripped model in any of the indices that were compared.

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