The Fundamental Plane of field early- type galaxies from z~ 0.7 to z=0

Details The Fundamental Plane of field early- type galaxies from z~ 0.7 to z=0 The Fundamental Plane of field early- type galaxies from z~ 0.7 to z=0

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9222t&link_type=abstract

HST Proposal ID #9222

Physics

Hst Proposal Id #9222 Cosmology

Scientific paper

The history of field early-type galaxies {E/S0} is a key ingredient to constrain galaxy formation theories: in hierarchical clustering models they form at z< 1 through major mergers, while in monolithic collapse models they form earlier and evolve passively thereafter. We are investigating the star formation history of field E/S0 using the redshift evolution of the Fundamental Plane {FP} as diagnostics. The first {z=0.1-0.4} part of the project- based on HST images and ESO 3.6m spectra- provided the following results: i} the FP exists and is tight out to z=0.4; ii} under the assumption of passive evolution of single burst populations, the z of formation is constrained to be z=0.8-1.6 {Omega=0.3, Omega_Lambda=0.7}; iii} field and cluster data are consistent within observational errors and cosmic scatter. We are currently obtaining spectra at the VLT {30 hrs approved on FORS}, in order to extend the project to z 0.7, where the diagnostics becomes dramatically more sensitive. By going to z 0.7, we will pinpoint the epoch of formation, and we will be able to detect relatively small differences in star formation history between field and cluster. In order to perform the highest redshift-and most promising-part of the study, it is essential to analyze 107 HST-WFPC2 images, already available in the archive. With this proposal we are seeking the necessary funds.

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