We present new information on galaxies in the vicinity of luminous radio galaxies (RGs) and quasars at z~4, 5, and 6. These fields were previously found to contain overdensities of Lyman Break Galaxies (LBGs) or spectroscopic Ly{alpha} emitters (LAEs), which were interpreted as evidence for clusters-in-formation ("protoclusters"). We use Hubble Space Telescope and Spitzer data to infer stellar masses from stellar synthesis models calibrated against the Millennium Run simulations, and contrast our results with large samples of LBGs in more average environments as probed by the Great Observatories Origins Deep Survey (GOODS).
Cone search capability for table J/ApJ/704/548/table4 (Photometric properties of V_606_-dropouts in the field of TN J0924-2201 (z=5.20))
Cone search capability for table J/ApJ/704/548/table5 (Photometric properties of i_775_-dropouts in the field of SDSSJ0836+0054 and SDSSJ1030+0524)
Cone search capability for table J/ApJ/704/548/tn1338 (Photometric properties in the field of)