The Fundamental Plane of Field Early Type Galaxies at z=1

Details The Fundamental Plane of Field Early Type Galaxies at z=1 The Fundamental Plane of Field Early Type Galaxies at z=1

2003-12-09

arxiv.org/abs/astro-ph/0312230v1

Astrophys.J. 601 (2004) L5-L8

Astronomy and Astrophysics

Astrophysics

4 pages incl. 4 figures, Accepted for publication in ApJ Letters

Scientific paper

10.1086/381887

We present deep VLT spectra of early type galaxies at z~1 in the Chandra Deep Field South, from which we derive velocity dispersions. Together with structural parameters from Hubble Space Telescope imaging, we can study the Fundamental Plane for field early type galaxies at that epoch. We determine accurate mass-to-light ratios and colors for four field early type galaxies in the redshift range 0.962). The lower mass galaxies at z~1 have a lower average mass-to-light ratio, and one is a genuine 'E+A' galaxy. The mass-to-light ratios indicate that their luminosity weighted ages are a factor of three younger at the epoch of observation, due to either a late formation redshift, or due to late bursts of star formation contributing 20-30% of the mass.

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