UV Spectral Dating of Galaxies

Details UV Spectral Dating of Galaxies UV Spectral Dating of Galaxies

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7433h&link_type=abstract

HST Proposal ID #7433

Physics

Hst Proposal Id #7433 Galaxies

Scientific paper

We are working to calculate a highly accurate library of UV stellar spectra that can be used to estimate the age and metallicity of galaxies of intermediate age {between 1 and 8 Gyrs}. The critical step in this effort is to test the model spectra against high-quality UV spectra of real stars. Only by verifying the models in this way can we have confidence in the synthetic spectra, especially those for the very high metallicity found in the cores of elliptical galaxies. We therefore propose to obtain STIS/E230M spectra of 16 late-A and F-type stars for this purpose. We will then use our library of UV spectra in conjunction with current evolutionary models to explore the effects of age, metallicity, non-solar abundance ratios, and IMF on the rest-frame UV spectrum of a galaxy. Our goal is to break the age-metallicity degeneracy that stymies present methods of dating galaxies.

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