Element by Element Abundances in Spheroidal Galaxies

Details Element by Element Abundances in Spheroidal Galaxies Element by Element Abundances in Spheroidal Galaxies

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006noao.prop..254w&link_type=abstract

NOAO Proposal ID #2006A-0254

Astronomy and Astrophysics

Astronomy

Scientific paper

Element-by-element abundances will be derived from high quality long slit KPNO 4m spectra of nearby elliptical galaxies that span the range of velocity dispersion. Analysis of these spectra will give the abundances of 18 individual elements to bring to extragalactic astronomy the same luxurious situation now enjoyed only by stellar spectroscopists. These spectra will reveal the basic element ratio behavior as a function of galaxy velocity dispersion. For example, [Mg/Fe] is seen to be enhanced in large galaxies, but not small ones. We propose to expand our purview from 2 elements (Mg and Fe) to 18 elements. This, in turn, will tie directly to chemical evolution and chemical enrichment mechanisms. As a byproduct, we also decrease the stellar population age uncertainty by about a factor of ten from today's Balmer-metal index diagram techniques.

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