High redshift galaxies already old?

Details High redshift galaxies already old? High redshift galaxies already old?

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..408..297w&link_type=abstract

The ultraviolet universe at low and high redshift. AIP Conference Proceedings, Volume 408, pp. 297-302 (1997).

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Quasars, Astronomical Observations

Scientific paper

We have found 3 Lyman alpha emission line galaxies at redshift 2.38, near the QSO absorption line complex at that redshift in the spectrum of Q2139-4434. All 3 galaxies are strong Lyman alpha emitters, and have much redder continuum colors (I-K~5) than other optically-selected high redshift galaxies. We hypothesize that these 3 galaxies are QSO IIs; radio-quiet counterparts of high redshift radio galaxies, containing concealed QSO nuclei. The red colors are most easily modeled by an old (>0.5 Gyr), massive (>1011 solar masses) stellar population. If true, this implies that at least one galaxy cluster of mass >>3×1011 solar masses had collapsed before redshift 5. A more detailed description may be found in Francis, Woodgate and Danks (1997).

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