Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-02-19
Astronomy and Astrophysics
Astrophysics
4 pages, 1 Figure. To be published in ASP Conference Series
Scientific paper
A survey of H alpha emission in 320 spiral galaxies in 8 nearby clusters shows an enhancement of circumnuclear starburst emission with increasingly rich clusters. These observations provide convincing evidence that spirals have been transformed into S0s in clusters predominantly by tidal forces, a picture fully in accord with the most recent numerical simulations of clusters. For the richest clusters, the enhancement of starburst emission is greater than would be expected on the basis of increasing galaxy surface density alone, which may explain the anomalous result for the type-galaxy surface density relation found for low richness clusters at intermediate redshift.
Moss Calvin
Whittle Mark
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