A Group of Red, L[CLC]y[/CLC]α-emitting, High-Redshift Galaxies
Open Access
- 10 June 1997
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 482 (1) , L25-L28
- https://doi.org/10.1086/310667
Abstract
We have discovered two new high-redshift (z = 2.38) galaxies near the previously known z = 2.38 galaxy 2139-4434B1 (Francis et al.). 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 II's, radio-quiet counterparts of high-redshift radio galaxies containing concealed QSO nuclei. The red colors are modeled most easily by an old (>0.5 Gyr), massive (>1011 M☉) stellar population. If true, this implies that at least one galaxy cluster of mass 3 × 1011 M☉ had collapsed before redshift 5.Keywords
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