GHOSTS: Stellar Outskirts of Massive Spiral Galaxies

Details GHOSTS: Stellar Outskirts of Massive Spiral Galaxies GHOSTS: Stellar Outskirts of Massive Spiral Galaxies

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11613d&link_type=abstract

HST Proposal ID #11613. Cycle 17

Computer Science

Scientific paper

We propose to continue our highly successful GHOSTS HST survey of the resolved stellar populations of nearby, massive disk galaxies using SNAPs. These observations provide star counts and color-magnitude diagrams 2-3 magnitudes below the tip of the Red Giant Branch of the outer disk and halo of each galaxy. We will measure the metallicity distribution functions and stellar density profiles from star counts down to very low average surface brightnesses, equivalent to ~32 V-mag per square arcsec. This proposal will substantially improve our unique sampling of galaxy outskirts. Our targets cover a range in galaxy mass, luminosity, inclination, and morphology. As function of these galaxy properties this survey provides: - the most extensive, systematic measurement of radial light profiles and axial ratios of the diffuse stellar halos and outer disks of spiral galaxies; - a comprehensive analysis of halo metallicity distributions as function of galaxy type and position within the galaxy; - an unprecedented study of the stellar metallicity and age distribution in the outer disk regions where the disk truncations occur; - the first comparative study of globular clusters and their field stellar populations. We will use these fossil records of the galaxy assembly process to test halo formation models within the hierarchical galaxy formation scheme.;

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