Evolution of the fundamental plane of early-type galaxies in the EGS

Details Evolution of the fundamental plane of early-type galaxies in the EGS Evolution of the fundamental plane of early-type galaxies in the EGS

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011hsa6.conf..180f&link_type=abstract

Highlights of Spanish Astrophysics VI, Proceedings of the IX Scientific Meeting of the Spanish Astronomical Society (SEA), held

Astronomy and Astrophysics

Astrophysics

Scientific paper

We studied the evolution of the Fundamental Plane in B and g-bands, for a sample of early--type galaxies in the redshift range 0.2 < z < 1.2. Assuming that effective radii and velocity dispersions do not evolve with redshift, we found that the galaxies at ˜ 0.7 were 0.68 mag brighter in the B-band and 0.52 mag brighter in the g-band, than their local counterparts. However, the scatter in the FP for our high-redshift sample 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. From the study of the Kormendy relation at different redshifts, we found the existence of a population of very bright and compact galaxies that were almost nonexistent at z = 0. The evolution of these compact objects would be mainly caused by an increase in size that could be explained by the action of dry minor mergers, more efficient by increasing the size that the stellar mass of galaxies. These bright and compact objects would be responsible for the evolution found in the Fundamental Plane.

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