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Title:
Advanced Camera for Surveys Photometry of the Cluster RDCS 1252.9-2927: The Color-Magnitude Relation at z = 1.24
Authors:
Blakeslee, John P.; Franx, Marijn; Postman, Marc; Rosati, Piero; Holden, Brad P.; Illingworth, G. D.; Ford, H. C.; Cross, N. J. G.; Gronwall, C.; Benítez, N.; Bouwens, R. J.; Broadhurst, T. J.; Clampin, M.; Demarco, R.; Golimowski, D. A.; Hartig, G. F.; Infante, L.; Martel, A. R.; Miley, G. K.; Menanteau, F.; Meurer, G. R.; Sirianni, M.; White, R. L.
Affiliation:
AA(Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218; .), AB(Leiden Observatory, P.O. Box 9513, 2300 RA Leiden, Netherlands.), AC(Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218; .; Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AD(European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany.), AE(University of California Observatories, Lick Observatory, Natural Sciences II Annex, UC Santa Cruz, Santa Cruz, CA 95064.), AF(University of California Observatories, Lick Observatory, Natural Sciences II Annex, UC Santa Cruz, Santa Cruz, CA 95064.), AG(Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218; .), AH(Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218; .), AI(Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218; .), AJ(Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218; .), AK(Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218; .), AL(Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel.), AM(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AN(European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany.), AO(Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218; .), AP(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AQ(Pontificia Universidad Catolica de Chile, Department of Astronomy and Astrophysics, Casilla 306, Santiago, Chile.), AR(Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218; .), AS(Leiden Observatory, P.O. Box 9513, 2300 RA Leiden, Netherlands.), AT(Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218; .), AU(Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218; .), AV(Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218; .), AW(Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218; .; Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.)
Publication:
The Astrophysical Journal, Volume 596, Issue 2, pp. L143-L146. (ApJ Homepage)
Publication Date:
10/2003
Origin:
UCP
ApJ Keywords:
Cosmology: Observations, Galaxies: Clusters: Individual: Alphanumeric: RDCS 1252-2927, Galaxies: Elliptical and Lenticular, cD, Galaxies: Fundamental Parameters
DOI:
10.1086/379234
Bibliographic Code:
2003ApJ...596L.143B

Abstract

We investigate the color-magnitude (CM) relation of galaxies in the distant X-ray-selected cluster RDCS 1252.9-2927 at z=1.24 using images obtained with the Advanced Camera for Surveys on the Hubble Space Telescope in the F775W and F850LP bandpasses. We select galaxies based on morphological classifications extending about 3.5 mag down the galaxy luminosity function, augmented by spectroscopic membership information. At the core of the cluster is an extensive early-type galaxy population surrounding a central pair of galaxies that show signs of dynamical interaction. The early-type population defines a tight sequence in the CM diagram, with an intrinsic scatter in observed (i775-z850) of 0.029+/-0.007 mag based on 52 galaxies or 0.024+/-0.008 mag for ~30 elliptical galaxies. Simulations using the latest stellar population models indicate an age scatter for the elliptical galaxies of about 34%, with a mean age τL>~2.6 Gyr (corresponding to zL>~2.7), and the last star formation occurring at zend>~1.5. Transforming to rest-frame (U-B), we conclude that the slope and scatter in the CM relation for morphologically selected early-type galaxies show little or no evidence of evolution out to z~1.2. Thus, elliptical galaxies were already well established in X-ray-luminous clusters when the universe was a third of its present age.
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