Mathematics – Logic
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop..391b&link_type=abstract
NOAO Proposal ID #2002B-0391
Mathematics
Logic
Scientific paper
We propose obtain deep long-slit spectroscopy along the major and minor axes of three field elliptical galaxies, out to ~eq2 effective radii. We will use these data to measure the stellar population gradients of age, metallicity, and (alpha)-element enhancement, and also the outer halo kinematics. Combined, this information will provide a direct look at the evolutionary histories of these galaxies and their dark matter profiles. The large radii kinematics and stellar populations of elliptical galaxies have been poorly studied, and this is especially true for low-luminosity and field galaxies. It now appears that the kinematics in the outer regions can significantly constrain cosmological simulations in terms of galaxy formation and evolution. It is important, though, not to bias our understanding by only observing the nearest & brightest cluster galaxies. We will concentrate on three field galaxies for this initial study: NGC 821, NGC 1132, and NGC 7454. These data require large aperture telescopes, but can be obtained in any seeing conditions, and are thus ideal for queue based telescopes such as Gemini and the HET.
Bergmann Marcel
Gebhardt Karl
Jorgensen Inger
Zabludoff Ann
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