Properties of Globular Cluster Populations of Early-Type E+A Galaxies

Astronomy and Astrophysics – Astronomy

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Scientific paper

Using the unique depth and spatial resolution afforded by the HST/ACS, we study a sample of early-type galaxies from the Malin and Carter (1983) catalog of shell galaxies. We selected galaxies with post-starburst (E+A) spectra to investigate the formation history of stars and globular clusters in early-type galaxies with post-starburst populations. A detailed analysis of their globular cluster systems shows a wide variety of cluster color properties in the sample, ranging from a single peak in the color distribution to multiple peaks. We present evidence for the presence of three distinct subpopulations of globular clusters in at least one galaxy, AM 0139-655. The brightest shells in some sample galaxies harbor some of the youngest clusters observed. This seems to indicate that the same merger event was responsible for the formation of both the shells and the young GCs.
Support for this work was provided by NASA through grant number GO-10227 from the Space Telescope Science Institute.

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