Disk Globular Clusters in Edge-On Spiral Galaxies

Mathematics – Logic

Scientific paper

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Hst Proposal Id #6092 Galaxies &Amp, Clusters

Scientific paper

The role of interactions and mergers in the formation and evolution of galaxies is controversial. However, evidence is growing that galaxy morphology is determined to some extent by mergers. In this proposal we address the specific question of the origin of the thick disk component of spiral galaxies. By searching two nearby edge-on spirals for the presence of disk globular clusters we will be able to constrain formation models for thick disks. With only modest exposure times we will test the hypothesis that the thick disks of spiral galaxies are formed by the accretion of one or more satellite galaxies. This hypothesis is directly related to critical questions concerning galaxy formation, including the frequency of galaxy mergers, the role mergers play in determining the morphology of galaxies, the observed thinness of spiral disks and the conflict it raises with predicted merger rates in cosmological models, and the relation between the thick disk stars and globular clusters in the Milky Way. The discovery of disk globular clusters in our target objects would represent the first detection of such objects outside the Local Group.

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