Early-type galaxies in clusters are some of the oldest and most massive galaxies in the universe. We know this from measurements of their colors and their mass to light ratios. They also dominate the massive end of the cluster galaxy population. My recent work has focused on the evolution in the numbers of these objects in massive clusters. We find that the early-type galaxy fraction does not change for galaxies with stellar masses above log M = 10.6. Previous works finds that the early-type galaxy fraction evolves rapidly, but most of that evolution must be occuring in lower mass systems. My most current project is investigating if the fraction of S0 galaxies, disk-like systems that are hypothesized to come from spiral galaxies that have stopped forming new stars, evolves in mass-selected samples.
- "The Ellipticities of Cluster Early-type Galaxies from z~1 to z~0: No Evolution in the Overall Distribution of Bulge-to-Disk Ratios", Holden, B. P., et al., ApJ accepted ADS
- "The Evolution of the Field and Cluster Morphology-Density
Relation for Mass-Selected Samples of Galaxies", van der Wel, A., Holden, B. P., et al., ApJ 670, 206 ADS
- "Mass Selection and the Evolution of the Morphology-Density Relation from z = 0.8 to 0", Holden, B. P., et al., ApJ 670, 190 ADS (arXiv:0707.2782)
- "The Possible z=0.83 Precursors of z=0 M* Early-type Cluster Galaxies", Holden, B. P., et al., ApJL, 642, 123 ADS (astro-ph/0603839)
- "Evolution in the Cluster Early-Type Galaxy Size-Surface Brightness Relation at z~1", Holden, B. P., et al., 2005, ApJ, 630, 137 ADS (astro-ph/0503365).
- "The Fundamental Plane of Cluster Ellipticals at z=1.25: Evolution in the Mass to Light Ratio", Holden, B. P., et al., 2005, ApJL, 620, L83 ADS astro-ph/0412570
- "Evolution in the Colors of Early-Type Clusters Galaxies", Holden, B. P., Stanford, S. A., Eisenhardt, P., & Dickinson, M. 2004, AJ, 127, 2484 ADS astro-ph/0503367
The ACS team has constructed a sample of z=0.8 to 1.3 clusters of galaxies. For each cluster, we have imaging in two passbands to study galaxy properties as a function of morphology, color and stellar mass. Below I list some of the papers, only those from 2006.
- "The Formation Epoch of Early-Type Galaxies in the z ~ 0.9 Cl 1604 Supercluster", Homeier, N. L., et al. ApJ, 647, 256 ADS astro-ph/0604390
- "Evolution of the Color-Magnitude relation in High-Redshift Clusters: Early-type Galaxies in the Lynx Supercluster at z~1.26", Mei, S., et al.,ApJ, 644, 759 ADS astro-ph/0604082
- "Clusters at Half Hubble Time: Galaxy Structure and Colors in RXJ0152.7-1357 and MS1054-03", Blakeslee, J. P., et al., ApJ, 644, 30 ADS astro-ph/0603058
- "Weak-lensing Detection at z ~ 1.3: Measurement of the Two Lynx Clusters with the Advanced Camera for Surveys", Jee, M. J., et al., ApJ, 642,720 ADS astro-ph/0601334
- "Evolution of the Color-Magnitude Relation in High-Redshift Clusters: Blue Early-Type Galaxies and Red Pairs in RDCS J0910+5422", Mei, S., et al.,ApJ, 639, 81 ADS astro-ph/0601327
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Any thought, idea, or opinion expressed in this document in no way reflects upon the policies University of California or UCO/Lick Observatories. Everything here is mine and mine alone.