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J.W. Colbert, R.M. Rich, M.M. Malkan (UCLA), J.A. Frogel, S. Salim (Ohio State)
We have analysed the third deepest HST field imaged to date, centered on the z=2.39 radio galaxy 53w002 and an associated cluster of possible protogalactic clumps. We find that the summed images in F450W, F606W, and F814W reach within 0.5-1.0 mag of the depth of the Hubble Deep Field North. To this we add fully reduced JHK imaging (to K=21.5) obtained at the 2.4 m Hiltner telescope at the MDM observatory, obtained using the TIFKAM imager and covering a full field of 2.5\times 5.0\prime. This yields a complete set of multi-wavelength photometry suitable for photometric redshift analysis, and we find photometric redshifts for nearly all of the IR-detected objects in the WFPC2 field. We find 3 objects in the WFPC2 field with V-K>6 which can be considered to be EROs and with photometric redshifts near z=1.2. We present imaging of one ERO which changes morphology from a disky object in the optical to spheroid-like in the infrared; a very good fit to a photometric redshift of z=1.2 is found, with high extinction and an old population. Our K vs J-K color-magnitude diagram is bifurcated in color with two branches near J-K=1 and 1.7 respectively, but we see no obvious spatial or redshift clustering for those objects brighter than K=19.
The author(s) of this abstract have provided an email address for comments about the abstract: colbert@astro.ucla.edu