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Resolving the Outer Disks and Halos of Nearby Galaxies

In a hierarchical merging scenario, the outer parts of a galaxy are a fossil record of the galaxy's early history. Observations of the outer disks and halos of galaxies thus provide a tool to study individual galaxy histories and test formation theories. Locally, an impressive effort has been made to understand the halo of the Milky Way, Andromeda, and M33. However, due to the stochastic nature of halo formation, a better understanding of this process requires a large sample of galaxies with known halo properties. The GHOSTS project (PI: R. de Jong) aims to characterize the halos and outer portions of 14 nearby (D=4-14 Mpc) spiral galaxies using the Hubble Space Telescope. Detection of individual stars in the outer parts of these galaxies enables us to study both the morphological properties of the galaxies, and determine the stars' metallicity and age.

preprint2007arXivOpen access
Anil SethRoelof de JongDavid Radburn-SmithHenry Ferguson
astro-ph
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Anil SethRoelof de JongDavid Radburn-SmithHenry Ferguson

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