Globular Clusters of Low Surface Brightness Galaxies

Computer Science

Scientific paper

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Hst Proposal Id #8213 Galaxy Populations And Interactions

Scientific paper

We propose to investigate globular cluster {GC} systems in giant low surface brightness {LSB} galaxies. The primary goals of the project are to determine the number of GCs in two nearby LSB galaxies and to estimate their ages. LSB spirals tend to be more isolated, more gas rich, and have had more quiescent star formation than their high surface brightness {HSB} cousins. LSB galaxies have either been forming stars very slowly for a Hubble time or have formed within the last few Gyr. Thus, their star formation histories may be very different from those of HSB galaxies. We will use the ages of the GCs to estimate the cluster formation histories of LSBs. The colors and magnitudes of their GCs will allow us to date the clusters and put constraints on when the galaxies started to form. Thus, we may be able to distinguish whether they are very slowly evolving or very young. We will also compare the specific globular cluster frequency {number per unit luminosity} and the shap e of the GC luminosity function in LSBs with those quantities for GCs in HSB spirals. The results of this project will have important implications for galaxy and GC formation.

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