Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...458l..63l&link_type=abstract
Astrophysical Journal Letters v.458, p.L63
Astronomy and Astrophysics
Astronomy
11
Galaxies: Stellar Content, Galaxies: Evolution, Galaxies: Starburst, Galaxies: Peculiar
Scientific paper
We present long-slit spectrophotometry of eight "E + A" galaxies which have been previously identified in the literature. We use a simple two-parameter modeling scheme to test if their stellar populations can be characterized uniquely by a decaying instantaneous starburst of well-determined age superposed upon a steady state galaxy substrate. Five of the objects are well characterized by burst-plus-elliptical galaxy models; two others are best fit by burst-plus-spiral galaxy models. One object cannot be described by such models, but it does resemble the spectra of some nearby merging galaxies with E + A--like spectra, possibly suggesting a multiple-burst scenario. Significant degeneracies, however, combined with the finite signal-to-noise of the data, severely limit the effectiveness of using optical spectral energy distributions alone to constrain the ages and mass fractions of the starburst components. The interpretation of E + A galaxies, especially at high redshift, must be approached cautiously.
Green Robert F.
Liu Charles T.
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