The Third Deepest Hubble Deep Field: HST Photometry and Ground-Based IR Imaging

Details The Third Deepest Hubble Deep Field: HST Photometry and Ground-Based IR Imaging The Third Deepest Hubble Deep Field: HST Photometry and Ground-Based IR Imaging

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.0703c&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #07.03; Bulletin of the American Astronomical Society, Vol. 33, p.1314

Astronomy and Astrophysics

Astronomy

Scientific paper

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 2.5x 5.0'. 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.

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