Early-Type Galaxies from z=1 to the Present: The Fundamental Plane in the Rest-Frame B- and K-Band
Arjen van der Wel
From deep VLT spectra and ACS imaging I measured the evolution of
the mass-to-light ratio of field early-type galaxies out to z=1.15.
Galaxy formation models predict that field galaxies are younger
than equally massive cluster galaxies. However, I find that the pace of
evolution of M/L does not depend on environment, such that there is no age
difference between equally massive field and cluster galaxies. On the
other hand, the age of a galaxy does depend on its mass.
Using IRAC imaging from Spitzer I derive rest-frame K-band properties of
the early-type galaxies at z=1. This constrains stellar population models
and provides a calibration for masses derived from SED fitting, by
comparing these to the dynamical masses obtained via the FP.