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• W2006061680 abstract "view Abstract Citations (49) References (62) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spectra of Galaxies in Clusters. II. Models for the Spectra of Postburst and Stripped Galaxies Newberry, Michael V. ; Boroson, Todd A. ; Kirshner, Robert P. Abstract We have computed models for the spectral evolution of early-type galaxies undergoing starbursts and for a model of a late-type galaxy where stripping halts star formation. The goal of this work is to investigate the peculiar combination of mean Balmer absorption strengths, (H) = 7-8 A, and relatively red color, B-V = 0.74 +/- 0.1, observed in the E + A spectra of galaxies in 3C 295 and other high-redshift rich clusters. We find that bursts consuming ~ 3%-8% of the luminous mass of the underlying galaxy match the observed <H> and B-V quite well. These values are also produced by a stripped model which terminates star formation over a time of ~0.1 Gyr or less. Since both types of models match the data, there is no strong reason to reject the stripping picture in favor of starbursts occurring in the densest clusters. We have computed a number of line and band absorption and continuum indices which can be measured in the optical spectra of faint high-redshift galaxies. Bursts having a constant star formation rate of ~ 0.5 Gyr duration cannot be distinguished from the stripped model in any of the indices that were compared. However, bursts that do not form O-B2 stars and have delayed star formation can be distinguished from the stripped model in comparisons between <H> and the 4000 A break, H+K, and G band indices. Since the 4000 A break is affected by the internal reddening in a galaxy, the H+K and G band indices are the best discriminators of star formation history. The separation between the various models is not large in any indices and a measurement precision of at least 5% is required to discriminate between them. We suggest that many of the E+A galaxies observed in high-redshift clusters might be recently stripped, while those in the high-redshift field are experiencing starbursts. Publication: The Astrophysical Journal Pub Date: February 1990 DOI: 10.1086/168413 Bibcode: 1990ApJ...350..585N Keywords: Astronomical Spectroscopy; Balmer Series; Galactic Clusters; Galactic Evolution; Star Distribution; Starburst Galaxies; Absorption Spectra; Galactic Radiation; Spectrum Analysis; Star Formation Rate; Astrophysics; GALAXIES: CLUSTERING; GALAXIES: EVOLUTION; GALAXIES: STELLAR CONTENT full text sources ADS | data products SIMBAD (3) Related Materials (1) Part 1: 1988ApJ...335..629N" @default.
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• W2006061680 title "Spectra of galaxies in clusters. II - Models for the spectra of postburst and stripped galaxies" @default.
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