A Group of Red, Lyα Emitting, High Redshift Galaxies
نویسندگان
چکیده
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 (> 1011M⊙) stellar population. If true, this implies that at least one galaxy cluster of mass ≫ 3× 1011M⊙ had collapsed before redshift five. Subject headings: galaxies: clusters: individual (2139−4434) — galaxies: distances and redshifts Based on observations carried out at the Anglo Australian Telescope, Cerro Tololo Interamerican Observatory, and Siding Spring Observatory
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