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By Paul J. Francis, Bruce E. Woodgate and Anthony C. Danks

Abstract

We have discovered two new high redshift (z = 2.38) galaxies, near the previously known z = 2.38 galaxy 2139−4434 B1 (Francis et al. 1996). All three galaxies are strong Lyα emitters, and have much redder continuum colors (I − K ∼ 5) than other optically-selected high redshift galaxies. We hypothesize that these three galaxies are QSO IIs; radio-quiet counterparts of high redshift radio galaxies, containing concealed QSO nuclei. The red colors are most easily modelled by an old (> 0.5 Gyr), massive (> 10 11 M⊙) stellar population. If true, this implies that at least one galaxy cluster of mass ≫ 3 × 10 11 M ⊙ had collapsed before redshift five

Topics: Observatory, and Siding Spring Observatory – 2 –
Year: 1997
OAI identifier: oai:CiteSeerX.psu:10.1.1.317.1527
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