HST observations of distant clusters: Evidence for old ellipticals and younger S0s

Details HST observations of distant clusters: Evidence for old ellipticals and younger S0s HST observations of distant clusters: Evidence for old ellipticals and younger S0s

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..393..535d&link_type=abstract

The seventh astrophysical conference: Star formation, near and far. AIP Conference Proceedings, Volume 393, pp. 535-542 (1997).

Mathematics

Logic

Galaxy Clusters, Origin, Formation, Evolution, Age, And Star Formation, Magnitudes And Colors, Luminosities, Elliptical Galaxies, Stellar Content And Populations, Radii, Morphology And Overall Structure

Scientific paper

The ``MORPHS'' group has completed the cataloging, parameterization, and morphological classification of ~2000 galaxies in 11 rich clusters from 0.363 for cluster ellipticals. This is consistent with the evolution of the morphology-density relationship, in which we find ellipticals to be as abundant at z~0.5 as in clusters today, and already well ensconced in the dense regions. In contrast, S0's are less plentiful and less well-concentrated compared to the present epoch, and spiral galaxies everywhere more abundant. Combined with other spectroscopic and morphological data, these observations suggest that most of these rapidly evolving systems are not likely to become bright ellipticals, which were more likely formed at early epochs. Cluster S0 galaxies, on the other hand, are likely to have been produced in large numbers in the recent past.

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