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26 April 2024 |
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The properties of field elliptical galaxies at intermediate redshift. III: the Fundamental Plane and the evolution of stellar populations from z~0.4 to z=0 | | T. Treu
; M. Stiavelli
; G. Bertin
; S. Casertano
; P. M{o}ller
; | | Date: |
8 Jun 2001 | | Journal: | Mon.Not.Roy.Astron.Soc. 326 (2001) 237 | | Subject: | astro-ph | | Affiliation: | 1, 2, 3), M. Stiavelli , G. Bertin (1, 4), S. Casertano , P. M{o}ller ( Scuola Normale Superiore, Space Telescope Science Institute, California Institute of Technology, Universita’ di Milano, European Southern Observatories | | Abstract: | We report on the study of a sample of 25 field early-type galaxies, in the redshift range z~0.1-0.5, selected on the basis of colours and morphology from the HST-MDS. Field early-type galaxies define a tight Fundamental Plane (FP) out to z~0.4, with scatter unchanged with respect to local samples, within the observational errors. The intermediate redshift FP is offset with respect to the FP of the Coma Cluster. The offset of the FP is found to increase with redshift. The evolution of the FP is studied quantitatively with a Bayesian-Montecarlo technique. By applying this technique, we find that the offset of the intercept of the FP (Delta gamma) with respect to the local FP increases as Delta gamma = au z with the following 68 per cent limits: 0.33< au<0.44 (for Omega=1, Omega_{Lambda}=0) or 0.44< au<0.56 (for Omega=0.3,Omega_{Lambda}=0.7). In addition, we interpret the results in terms of the evolution of the stellar populations, under the assumption of passive evolution. In a single-burst scenario, the observed properties are consistent with those of a stellar population formed at z>2 (for Omega=1, Omega_{Lambda}=0, H_0=50 kms Mpc^{-1}) or 0.8 | | Source: | arXiv, astro-ph/0106147 | | Services: | Forum | Review | PDF | Favorites | |
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