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| Paper: |
Chemical Abundances in the Extreme Outer Regions of Disk Galaxies |
| Volume: |
147, Abundance Profiles: Diagnostic Tools for Galaxy History |
| Page: |
103 |
| Authors: |
Ferguson, Annette; Wyse, Rosemary; Gallagher, John S. |
| Abstract: |
Most H ii region abundance studies to date have targetted the bright, easily observed regions which lie within the optical disks (i.e. R25) of galaxies. It is well known, however, that disk galaxies have H i disks which extend typically to 1.5-2 R25, and in some rare cases, even further out. A knowledge of the metallicity of this extreme outer disk gas is of great importance for understanding disk galaxy evolution. We present here the first results from a study to measure chemical abundances beyond the optical edges of disk galaxies, using a sample of newly-discovered extreme outer disk H ii regions. |
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