Stellar Age and Metallicity Gradients in Disk Galaxies

Details Stellar Age and Metallicity Gradients in Disk Galaxies Stellar Age and Metallicity Gradients in Disk Galaxies

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.9518y&link_type=abstract

American Astronomical Society, AAS Meeting #211, #95.18; Bulletin of the American Astronomical Society, Vol. 39, p.897

Astronomy and Astrophysics

Astronomy

Scientific paper

We have used Lick indices to measure stellar age and metallicity gradients in a sample of edge-on late-type galaxies. Lower mass systems show strong age gradients and very small metallicity gradients, suggesting they have failed to chemically enrich despite signs of extended star formation. In more massive systems, the metallicity gradients are surprisingly large and comparable to gradients seen in galaxies with substantial bulge components. The outskirts of the massive systems also show signs of being enhanced in alpha-elements, suggesting these outer regions are chemically dominated by a recent burst of star formation and have not experienced extended enrichment.

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