Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-05-05
Astronomy and Astrophysics
Astrophysics
3 pages, 1 figure. Uses iaus style. To appear in the proceedings of IAU Colloquium No. 195, "Outskirts of Galaxy Clusters: int
Scientific paper
10.1017/S1743921304001097
We introduce our project that investigates the kinematic properties of early-type galaxies in 6 distant poor clusters at z~0.25. This study represents a continuation of our efforts to understand galaxy evolution in low-density environments. Higher-resolution MOSCA spectra have been obtained at the Calar Alto 3.5-m telescope with which we can measure absorption line strengths and velocity dispersions. In conjunction with our HST/F702W images of all the clusters, we are able to construct the Fundamental Plane of ellipticals and S0 galaxies in poor clusters at a look-back time of ~3 Gyrs. For galaxies outside the HST field, we concentrate our analysis on the Mg-sigma and Faber-Jackson relations. With the line strength diagrams age/metallicity distributions can be derived in densities between the field and rich cluster environments. Comparing with our rich clusters at the same cosmic epochs, the dependence of galaxy formation models on the local environment can be tested more quantitatively.
Fritz Alexander
Ziegler Bodo L.
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