Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-03-27
Astronomy and Astrophysics
Astrophysics
12 pages, 2 figures, uses aaspp4 style file. Accepted for publication in Astrophysical Journal Letters
Scientific paper
10.1086/310667
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 Ly-alpha emitters, and have much redder continuum colors (I-K about 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 (> 10E11 solar masses) stellar population. If true, this implies that at least one galaxy cluster of mass much greater than 3E11 solar masses had collapsed before redshift five.
Danks Anthony C.
Francis Paul J.
Woodgate Bruce E.
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