J/AJ/132/926        Galaxies in the Hubble Ultra Deep Field  (Coe+, 2006)
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Beginning of ReadMe : J/AJ/132/926 Galaxies in the Hubble Ultra Deep Field (Coe+, 2006) ================================================================================ Galaxies in the Hubble Ultra Deep Field. I. Detection, multiband photometry, photometric redshifts, and morphology. Coe D., Benitez N., Sanchez S.F., Jee M., Bouwens R., Ford H. <Astron. J., 132, 926-959 (2006)> =2006AJ....132..926C ================================================================================ ADC_Keywords: Surveys ; Galaxies, photometry Keywords: cosmology: observations - galaxies: distances and redshifts - galaxies: evolution - galaxies: photometry - galaxies: statistics - galaxies: structure Abstract: We present aperture-matched point-spread function (PSF)corrected BVi'z'JH photometry and Bayesian photometric redshifts (BPZ) for objects detected in the Hubble Ultra Deep Field (UDF), 8042 of which are detected at the 10 level (e.g., i'<29.01 or z'<28.43). Most of our objects are defined identically to those in the public STScI catalogs, enabling a straightforward object-by-object comparison. We have combined detections from i', z', J+H, and B+V+i'+ z' images into a single comprehensive segmentation map. Using a new program called SExSeg, we are able to force this segmentation map into SExtractor for photometric analysis. The resulting photometry is corrected for the wider NIC3 PSFs using our ColorPro software. We also correct for the ACS z'-band PSF halo. Offsets are applied to our NIC3 magnitudes, which are found to be too faint relative to the ACS fluxes. Based on BPZ spectral energy distribution (SED) fits to objects of known spectroscopic redshift, we derived corrections of -0.30+/-0.03mag in J and -0.18+/-0.04mag in H. Our offsets appear to be supported by a recent recalibration of the UDF NIC3 images combined with nonlinearity measured in NICMOS itself. The UDF reveals a large population of faint blue galaxies (presumably young starbursts), bluer than those observed in the original Hubble Deep Fields. Description: The UDF (03:32:39.0-27:47:29.1 [J2000.0]) was observed by the Wide Field Camera (WFC) of HST ACS for a total of 400 orbits: 56 orbits each in the B and V bands (F435W and F606W) and 144 orbits each in i' and z' (F775W and F850LP) We prune our catalog to the central 11.97arcmin^2^ of the ACS images, which has at least half the average depth of the whole image. The B, V, and i' UDF images are also  1.0, 0.9, and 1.4mag deeper than the respective HDF images. A filter similar to z' was not available to image the HDF, and its presence allows us to probe the UDF for i'-band dropout galaxies at 5.7< z< 7.