Resolving the Outer Disks and Halos of Nearby Galaxies
Anil Seth (1), Roelof de Jong (2), David Radburn-Smith (2), Henry, Ferguson (2) ((1) Harvard-Smithsonian CfA, (2) Space Telescope Science, Institute)
TL;DR
This paper discusses the GHOSTS project, which uses Hubble Space Telescope observations of 14 nearby spiral galaxies to study their outer disks and halos, providing insights into galaxy formation and evolution.
Contribution
The study presents a large sample analysis of galaxy halos and outer disks, advancing understanding of their properties and formation histories.
Findings
Characterization of halos and outer disks of 14 nearby galaxies
Analysis of stellar metallicity and age in galaxy outskirts
Insights into galaxy formation processes
Abstract
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.
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