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The metal-enriched outer disk of NGC2915

Werk, J; Putman, Mary E; Meurer, Gerhardt; Thilker, D. A.; Allen, R J; Bland-Hawthorn, Joss; Kravtsov, A; Freeman, Kenneth


We present optical emission-line spectra for outlying H II regions in the extended neutral gas disk surrounding the blue compact dwarf galaxy NGC2915. Using a combination of strong-line R23 and direct oxygen abundance measurements, we report a flat, possibly increasing, metallicity gradient out to 1.2 times the Holmberg radius. We find the outer disk of NGC2915 to be enriched to a metallicity of 0.4 Z. An analysis of the metal yields shows that the outer disk of NGC2915 is overabundant for its...[Show more]

CollectionsANU Research Publications
Date published: 2010
Type: Journal article
Source: Astrophysical Journal, The
DOI: 10.1088/0004-637X/715/1/656


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