Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-07-18
Astronomy and Astrophysics
Astrophysics
4 pages, including Figures. To appear in the proceedings of the "A Decade of HST Science", held at the Space Telescope Science
Scientific paper
We present preliminary results on the evolution of the stellar populations of field early-type galaxies (E/S0) from z=0.4 to z=0. The diagnostic tool used in this study is the Fundamental Plane (FP), a tight empirical correlation between their central velocity dispersion (sigma), effective radius (Re), and effective surface brightness (SBe), which is observed to hold in the local Universe. Using HST-WFPC2 archive images and spectra obtained at the ESO-3.6m telescope we measured the FP parameters for a sample of ~30 field E/S0s at z=0.2-0.4. Remarkably, field E/S0s at intermediate redshift also define a tight FP, with scatter unchanged with respect to that of local samples. The intermediate redshift FP is offset from the local one, in the sense that, for given RE and sigma, galaxies are brighter at z=0.4 than at z=0. The implication of the offset of the FP in terms of passive evolution of the stellar population depends on its star formation history. In a single burst scenario, the stellar populations of field E/S0s were formed at z=0.8-1.6 (Omega=0.3; Omega_{Lambda}=0.7; H_0=50 km/s/Mpc). Alternatively, the bulk of stars (90% in mass) can be formed at high redshift (z~3), and the rest in a secondary burst occurred more recently (z~0.5-0.8).
Bertin Giuseppe
Casertano Sefano
Moller Palle
Stiavelli Massimo
Treu Tommaso
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