Evidence for systematic evolution in the properties of galaxies in distant clusters

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galactic Clusters, Galactic Evolution, Astronomical Catalogs, Astronomical Photometry, Color-Color Diagram, Color-Magnitude Diagram, Elliptical Galaxies, Infrared Sources (Astronomy), Red Shift

Scientific paper

The evolution of galaxies as a function of look-back time is traced on the basis of data on early-type galaxies in rich cluster environments. It is shown that by selecting distant galaxies in the near-IR, representative samples containing approximately the same proportion of galaxy classes can be constructed independently of redshift, thus avoiding biases introduced by optical selection criteria. This method is used to construct a sample of 180 galaxies selected at near-IR wavelengths in the fields of 10 rich clusters with z in the range of 0.5 to 0.9. A clear and systematic trend with redshift in the optical-IR colors of red cluster galaxies is detected. By z of about 0.9, there are no cluster galaxies as red as present-day ellipticals.

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