A Group of Red, Ly-alpha Emitting, High Redshift Galaxies
Date
1997-03-27
Authors
Francis, Paul
Woodgate, Bruce E.
Danks, Anthony C.
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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 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.
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The Astrophysical Journal
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Journal article
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Open Access
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