Stellar Populations of Elliptical Galaxies in Virgo Cluster. I. The Data and Stellar Population Analysis
Copyright policy )Stellar Populations of Elliptical Galaxies in Virgo Cluster. I. The Data and Stellar Population Analysis
We have determined spectroscopic ages of elliptical galaxies in the Virgo cluster using spectra of very high signal-to-noise ratio (S/N/A > 100). We observed 8 galaxies with the Subaru Telescope and have combined this sample with 6 galaxies previously observed with the WHT. To determine their ages we have used a new method based on the Hgamma_sigma age indicator, which is virtually independent of the effects of metallicity. Apart from ages we have estimated abundances of various elements. In this paper we present the observations, the data reduction and the reliability of the Hgamma_sigma method. The results of this investigation are presented in a companion paper (Yamada et al. 2006).
33 pages, 9 figures, ApJ accepted
- University of Tokyo Japan
- Kapteyn Astronomical Institute University of Groningen Netherlands
- University of Gronigen Netherlands
- Kapteyn Astronomical Institute Netherlands
- Instituto de Astrofísica de Canarias Spain
ABSORPTION FEATURES, galaxies : evolution, COMA CLUSTER, Astrophysics (astro-ph), FOS: Physical sciences, STAR-FORMATION HISTORY, PRECISION PHOTOMETRY, Astrophysics, techniques : spectroscopic, cD, galaxies : stellar content, CHEMICAL ENRICHMENT, SYNTHESIS MODELS, LINE-STRENGTH GRADIENTS, GLOBULAR-CLUSTERS, galaxies : elliptical and lenticular, COLOR-MAGNITUDE RELATION, FEATURE INDEXES
ABSORPTION FEATURES, galaxies : evolution, COMA CLUSTER, Astrophysics (astro-ph), FOS: Physical sciences, STAR-FORMATION HISTORY, PRECISION PHOTOMETRY, Astrophysics, techniques : spectroscopic, cD, galaxies : stellar content, CHEMICAL ENRICHMENT, SYNTHESIS MODELS, LINE-STRENGTH GRADIENTS, GLOBULAR-CLUSTERS, galaxies : elliptical and lenticular, COLOR-MAGNITUDE RELATION, FEATURE INDEXES
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