The Globular Cluster Systems of Spiral Galaxies along the Hubble Sequence

Details The Globular Cluster Systems of Spiral Galaxies along the Hubble Sequence The Globular Cluster Systems of Spiral Galaxies along the Hubble Sequence

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9766f&link_type=abstract

HST Proposal ID #9766

Computer Science

Hst Proposal Id #9766 Galaxies

Scientific paper

While the globular cluster {GC} systems of ellipticals and ongoing mergers have been relatively well-studied with HST, very little is known about the GC systems of spirals besides the Milky Way and M31. To constrain GC/galaxy formation models, especially where spirals are the merger progenitors of ellipticals, it is crucial to understand their GC properties. We propose to obtain ACS images of three edge-on spirals, spanning the Hubble sequence, with Keck spectroscopic follow-up. This will effectively double the number of well-studied spiral systems. We will detect 100-200 GCs per galaxy, sufficient to reveal GC subpopulations, their relative numbers, radial trends, and dependences on Hubble type {e.g., a bulge vs. disk origin for red GCs}. For half of our GCs we will be able to measure individual sizes. By providing a much-needed comparative benchmark, these data will allow researchers to better exploit the large existing HST database of GCs in E/S0 galaxies.

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