Observational Evidence of Secular Evolution in Barred Galaxies

Details Observational Evidence of Secular Evolution in Barred Galaxies Observational Evidence of Secular Evolution in Barred Galaxies

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..396..375p&link_type=abstract

Formation and Evolution of Galaxy Disks ASP Conference Series, Vol. 396, Proceedings of the conference held 1-5 October, 2007 at

Astronomy and Astrophysics

Astronomy

Scientific paper

We report preliminary results of the derived stellar population metallicities and ages along the bars of a sample of 20 barred galaxies. We find that some galaxies show a positive radial bar metallicity gradient, implying that there has been a chemical enrichment and so that the star formation has lasted for a long time. This fact indicates that some bars are long lived. The radial negative metallicity gradient found along the bar of some of the galaxies possibly reflects the original disk gradient. The metallicity gradient seems to be correlated with the central stellar velocity dispersion, with positive metallicity gradient being found in galaxies with higher central velocity dispersion.

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