The Nature of Early-Type Galaxies at the $z\approx0.5$ Epoch

Details The Nature of Early-Type Galaxies at the $z\approx0.5$ Epoch The Nature of Early-Type Galaxies at the $z\approx0.5$ Epoch

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pasp..109..344w&link_type=abstract

Publications of the Astronomical Society of the Pacific, v.109, p.344

Mathematics

Logic

3

Scientific paper

To address the connection between spectral type and morphology in distant cluster galaxies, we studied {\em Hubble Space Telescope} images of the clusters \Cl0939+47 (Abell 851) at $z=0.41$ and \Cl0016+16 at $z=0.55$. We measured ``metric'' sizes and brightnesses plus a quantitative profile shape indicator for galaxies in both clusters and used realistic galaxy simulations to help interpret the results. The spectral class and membership status of galaxies were determined from previously-published low-resolution spectroscopy, recent narrow multiband photometry, and new high-quality Keck Telescope spectra, yielding the largest existing set of spectrally-classified galaxies in these distant clusters. As expected, objects with emission-line spectra generally show disk morphology, while spectra dominated by late-type stars correspond to bulge-profile objects. In contrast with previous studies, we find the class of Balmer-strong (``E+A'') galaxies in each cluster to be morphologically diverse, containing some disklike or interacting objects and others which appear bulge-dominated. The observed existence of dynamically-young ``E+A'' galaxies appears incompatible with a merger hypothesis for their origin. These data also permit a test of whether the universe truly expands. (SECTION: Dissertation Summaries)

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