Ages and Metallicities of the Nuclei and Field Stars of Dwarf Elliptical Galaxies

Details Ages and Metallicities of the Nuclei and Field Stars of Dwarf Elliptical Galaxies Ages and Metallicities of the Nuclei and Field Stars of Dwarf Elliptical Galaxies

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.9515h&link_type=abstract

American Astronomical Society, AAS Meeting #211, #95.15; Bulletin of the American Astronomical Society, Vol. 39, p.897

Astronomy and Astrophysics

Astronomy

Scientific paper

We present preliminary ages and metallicities for six nucleated dwarf elliptical galaxies (dE,N) in the Fornax Cluster based on Lick/IDS index measurements and SSP models. Employing IRAF and IDL routines we have successfully extracted high signal-to-noise (S/N >= 30 per Å) Gemini GMOS-S spectra of both galactic nuclei and field star regions. Extracted spectrum have a wavelength range of 3,700 Å to 6,500 Å with a resolution of 4 Å. We fit our data with empirical chemo-evolutionary models to determine radial velocity along with Hb and [MgFe]' line indices. We then compare our measurements to current SSP model predictions by Bruzual & Charlot (2003) to determine age and metallicity. Results suggest that the dE nuclei have intermediate ages ( 5 Gyr) and less than solar metallicities ([Fe/H] <= -0.64dex). Comparing nuclei and dE field star spectra, we find evidence that in general the nuclei have undergone more recent star formation.
Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: The National Science Foundation (United States), the Particle Physics and Astronomy Research Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), CNPq (Brazil), and CONICET (Argentina).

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