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The Possible z=0.83 Precursors of z=0 M* Early-type Cluster Galaxies

B. P. Holden·M. Franx·G. D. Illingworth·M. Postman·J. P. Blakeslee·N. Homeier·R. Demarco·H. Ford·P. Rosati·D. Kelson·K. -V. Tran
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Abstract

We examine the distribution of stellar masses of galaxies in MS 1054-03 and RX J0152.7-1357, two X-ray selected clusters of galaxies at z=0.83. Our stellar mass estimates, from spectral energy distribution fitting, reproduce the dynamical masses as measured from velocity dispersions and half-light radii with a scatter of 0.2 dex in the mass for early-type galaxies. When we restrict our sample of members to high stellar masses, > 1e11.1 Msun (M* in the Schechter mass function for cluster galaxies), we find that the fraction of early-type galaxies is 79 +/- 6% at z=0.83 and 87 +/- 6% at z=0.023 for the Coma cluster, consistent with no evolution. Previous work with luminosity-selected samples finds that the early-type fraction in rich clusters declines from =~80% at z=0 to =~60% at z=0.8. The observed evolution in the early-type fraction from luminosity-selected samples must predominately occur among sub-M* galaxies. As M* for field and group galaxies, especially late-types, is below M* for clusters galaxies, infall could explain most of the recent early-type fraction growth. Future surveys could determine the morphological distributions of lower mass systems which will confirm or refute this explanation.

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B. P. Holden, M. Franx, G. D. Illingworth, M. Postman, J. P. Blakeslee, N. Homeier, R. Demarco, H. Ford, P. Rosati, D. Kelson, K. -V. Tran. 2006-04-20. The Possible z=0.83 Precursors of z=0 M* Early-type Cluster Galaxies. https://doi.org/10.1086/504714

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