Early-Type Galaxies in the Hubble Deep Field: The Star Formation History
- Giovanni Fasano
- A. Franceschini
- Alessandro Bressan
- Luigi Danese
- Gian Luigi Granato
- Laura Silva
- Stéphane Arnouts
DOIAbstract
We have investigated the properties of a complete K-band selected sample of 35 elliptical and S0 galaxies brighter than K=20.15 in the Hubble Deep Field, as representative of the field galaxy population. This sample has been derived from deep K-band image by the KPNO-IRIM camera, by applying a rigorous morphological classification scheme based on quantitative analyses of the surface brightness profiles. The broad-band spectra of the sample galaxies allow us to date their dominant stellar populations. The majority of bright early-types in this field are found at redshifts z<1.3 to display colors indicative of a fairly wide range of ages (typically 1.5 to 3 Gyrs). We find that the major episodes of star-formation building up typical M_star ga...
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