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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…
Mass and mass-to-light ratio of galaxy groups from weak lensing
Henk Hoekstra, Marijn Franx, Konrad Kuijken
We have measured for the first time the weak lensing signal due to groups of galaxies. The groups are at intermediate redshifts, and have been identified in the CNOC2 field survey,…
The Evolution of Early-Type Galaxies in Distant Clusters I.: Surface Photometry and Structural Parameters for 53 Galaxies in the z=0.33 Cluster CL1358+62
Daniel D. Kelson, Garth D. Illingworth, Pieter G. van Dokkum +1
Using HST imaging of CL1358+62 (z=0.33) structural parameters are derived for 53 cluster members. We fit integrated r^{1/4}-laws to the integrated S.B. profiles, and fit two-dimens…
Hubble Space Telescope weak lensing study of the z=0.83 cluster MS 1054-03
H. Hoekstra, M. Franx, K. Kuijken
We have measured the weak gravitational lensing signal of MS 1054-03, a rich and X-ray luminous cluster of galaxies at a redshift of z=0.83, using a two-colour mosaic of deep WFPC2…
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…
Spectrophotometry of nearby field galaxies: the data
R. A. Jansen, D. Fabricant, M. Franx +1
We have obtained integrated and nuclear spectra, as well as U, B, R surface photometry, for a representative sample of 196 nearby galaxies. These galaxies span the entire Hubble se…