14 papers · 1 filter
Cluster Evolution Since z~1
R. Demarco, J. P. Blakeslee, H. C. Ford +8
We have used the Advanced Camera for Surveys (ACS) on the HST to obtain optical imaging of a sample of 8 galaxy clusters in the redshift range 0.8 < z < 1.3. The ACS data provides…
BRIGHT lights, BIG city: Massive galaxies, giant Ly-a nebulae, and proto--clusters
W. van Breugel, M. Reuland, W. de Vries +10
High redshift radio galaxies are great cosmological tools for pinpointing the most massive objects in the early Universe: massive forming galaxies, active super--massive black hole…
A search for high redshift clusters associated with radio galaxies at 2 < z < 4
J. D. Kurk, B. P. Venemans, H. J. A. Roettgering +2
High redshift radio galaxies are amongst the most massive galaxies in the early Universe and have properties expected from central galaxies in forming clusters. We are carrying out…
Search for clusters at high redshift - I. Candidate Lya emitters near 1138-262 at z=2.2
J. D. Kurk, H. J. A. Rottgering, L. Pentericci +7
Radio, optical and X-ray observations of the powerful radio galaxy PKS 1138-262 at z=2.156 have suggested that this galaxy is a massive galaxy in the center of a forming cluster. W…
A study of young radio-loud AGN using space-VLBI
Ignas Snellen, Wolfgang Tschager, Richard Schilizzi +2
Gigahertz Peaked Spectrum (GPS) sources form a key element in the study of the onset and evolution of radio-loud AGN, since they are most likely the young counterparts of extended…
Limits on the Spatial Extent of AGN Measured with the Fine Guidance Sensors of the HST
Richard N. Hook, Ethan J. Schreier, George Miley
The optical structure of several AGN has been studied using the Fine Guidance Sensors (FGS) on the Hubble Space Telescope (HST). The FGSs are interferometric devices which can reso…