4 papers
Evolution of Cluster Early-Type Galaxies
P. G. van Dokkum, M. Franx, D. D. Kelson +2
The slow evolution of the M/L ratios, colors, and line strengths of cluster early-type galaxies to z=1 suggests that their stars were formed at very high redshift. At the same time…
Type Ia Supernovae and the Value of the Hubble Constant
Brad K. Gibson, Chris B. Brook
The methodology involved in deriving the Hubble Constant via the calibration of the corrected peak luminosities of Type Ia supernovae (SNe) is reviewed. We first present a re-analy…
A High Fraction of Mergers in the cluster MS1054-03 at z=0.83
M. Franx, P. G. van Dokkum, D. G. Fabricant +2
We used the Hubble Space Telescope to take a wide field, multicolor image of the high redshift cluster MS1054-03 at z=0.83. The Keck telescope was used to take 200 redshifts in the…
Luminous red mergers in the z=0.83 cluster MS1054-03: Direct evidence for hierarchical formation of massive early-type galaxies
P. G. van Dokkum, M. Franx, D. Fabricant +2
We present results from a morphological study of the distant X-ray cluster MS1054-03 at z=0.83. We have obtained a large, two color HST WFPC2 mosaic of this cluster, and measured r…