Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262..764a&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 3, p. 764-794.
Astronomy and Astrophysics
Astronomy
207
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.
Aragon-Salamanca Alfonso
Carter David
Couch Warrick J.
Ellis Richard S.
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