Mathematics – Logic
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ans...324...56f&link_type=abstract
Astronomische Nachrichten, Supplementary Issue 3, Vol. 324, Short Contributions of the Annual Scientific Meeting of the Astronom
Mathematics
Logic
Scientific paper
Understanding the formation and evolution of early-type galaxies and their stellar populations is one of the central problems in astrophysics. Although numerous studies on early-type galaxies in the local universe have been performed to address this question, the key question, when and within what timescales the stellar populations have been formed, has not yet answered sufficiently. Monolithic collapse models predict an intense burst of star formation at high redshift (zf>=2) and a following passive evolution of the stellar populations. The picture of hierachical galaxy formation (so-called 'bottom-up universe') presumes longer assembly timescales for the more massive galaxies with merging of galaxies and the infall of new cold gas from a galaxy's halo being the main drivers. Thus, galaxies formed through accumulation of small structures result in somewhat younger mean ages. In order to explore the evolution of galaxies, it it necessary to explore both the morphological evolution as well as the evolution of the luminosities and the mass-to-light (M/L) ratios of the galaxies. One of the most powerful tools is the Fundamental Plane (FP) of early-type galaxies. In a three dimensional parameter space, defined by three observables, the effective radius Re, effective surface brightness mue and velocity dispersion sigma, the FP establishes a tight correlation (Djorgovski & Davis 1987; Dressler et al. 1987).
We have conducted a study on early-type galaxies in Abell 2390 at intermediate redshift. Observations based on Multi-Object-Spectroscopy with MOSCA at the 3.5-m Calar Alto telescope, deep UBi ground-based imaging with the 5.1-m Hale telescope and HST photometry in the F555W and F814W filter bands yield a sample of N=51 early-type galaxies in the rich cluster Abell 2390 at a redhift z=0.23. Our investigation spans both a broad range in luminosity (-19.3>=MB>=-22.3) and a wide field of view (10'x10'). One of our main goals is to investigate possible differences between ellipticals and lenticular galaxies. Combining our sample of galaxies in A 2390 with an analogous study of the cluster Abell 2218 by Ziegler et al. (2001), we investigate in total ~100 early-type galaxies, one of the most extensive investigations at intermediate redshift (z~0.2).
Fritz Alexander
Ziegler Bodo L.
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