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Extremely Red Objects in the Field of QSO 1213-0017: A Galaxy Concentration at z=1.31

Michael C. Liu·Arjun Dey·James R. Graham·Charles C. Steidel·Kurt L. Adelberger
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Abstract

We have discovered an excess of extremely red objects (EROs) surrounding the z=2.69 quasar QSO 1213-0017 (UM 485). Optical/IR colors for these galaxies are consistent with z=1-2 ellipticals, and there are at least 5 galaxies with spectroscopic redshifts at =1.31. Keck optical spectra for 3 of the red galaxies show rest-frame UV breaks resembling local elliptical galaxies. Our initial results suggest a coherent structure in redshift, possibly arising from a massive galaxy cluster.

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Michael C. Liu, Arjun Dey, James R. Graham, Charles C. Steidel, Kurt L. Adelberger. 1999-10-25. Extremely Red Objects in the Field of QSO 1213-0017: A Galaxy Concentration at z=1.31. https://arxiv.org/abs/astro-ph/9910434

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