Evolution of the Fundamental Plane of 0.2<z<1.2 Early-type galaxies in the EGS

Details Evolution of the Fundamental Plane of 0.2<z<1.2 Early-type galaxies in the EGS Evolution of the Fundamental Plane of 0.2<z<1.2 Early-type galaxies in the EGS

2010-10-20

arxiv.org/abs/1010.4177v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Accepted for publication in A&A. 12 pages, 10 Figures, and 1 online table

Scientific paper

The Fundamental Plane relates the structural properties of early-type galaxies such as its surface brightness and effective radius with its dynamics. The study of its evolution has therefore important implications for models of galaxy formation and evolution. This work aims to identify signs of evolution of early-type galaxies through the study of parameter correlations using a sample of 135 field galaxies extracted from the Extended Groth Strip in the redshift range 0.2=0.7. However, the scatter in the FP is reduced by half when we allow the FP slope to evolve, suggesting a different evolution of early-type galaxies according to their intrinsic properties. The study of the Kormendy relation shows the existence of a population of very compact (Re<2 Kpc) and bright galaxies (-21.5>Mg>-22.5), of which there are only a small fraction (0.4%) at z=0. The evolution of these compact objects is mainly caused by an increase in size that could be explained by the action of dry minor mergers, and this population is responsible for the evolution detected in the Fundamental Plane.

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