13 February 2003 Ultradeep near-infrared imaging of the HDF-South: rest-frame optical properties of high redshift galaxies
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We have obtained ultradeep Js, H and Ks near-infrared imaging of the Hubble Deep Field South WFPC2 field with the ISAAC camera on the VLT. The total integration time of 100 hours resulted in the deepest ground-based infrared observations to date and the deepest Ks-band data ever taken. This depth allows us to determine the spectral energy distributions of the high-redshift galaxies with unprecendented accuracy. Together with existing optical observations, we use the multicolor data to select high-redshift galaxies by their rest-frame optical light, and study their statistical properties and morphologies. We find a wide variety of morphologies: some are large in the rest-frame optical and resemble normal spiral galaxies, others are barely detected in the observers optical and have red NIR colors. The latter belong to a new population of galaxies at redshifts z>2, that is notably absent in the HDF-North. The spectral energy distributions of many of such red galaxies show distinct breaks, which we identify as the balmer break/4000 Angstrom break, and their contribution to the stellar mass density is estimated to be substantial. At redshift z~3, we find a clear excess of superluminious galaxies (> 5 L*B(z=0)), which is consistent with 1 magnitude of luminosity evolution. Overall, the results show the necessity of deep near-infrared imaging to obtain a full census of the high redshift universe.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ivo Labbe, Ivo Labbe, Marijn Franx, Marijn Franx, Gregory Rudnick, Gregory Rudnick, Alan F. M. Moorwood, Alan F. M. Moorwood, Natascha Foerster Schreiber, Natascha Foerster Schreiber, Hans-Walter Rix, Hans-Walter Rix, Lottie van Starkenburg, Lottie van Starkenburg, Peter van Dokkum, Peter van Dokkum, Paul P. van der Werf, Paul P. van der Werf, Huub J. A. Roettgering, Huub J. A. Roettgering, Konrad Kuijken, Konrad Kuijken, } "Ultradeep near-infrared imaging of the HDF-South: rest-frame optical properties of high redshift galaxies", Proc. SPIE 4834, Discoveries and Research Prospects from 6- to 10-Meter-Class Telescopes II, (13 February 2003); doi: 10.1117/12.457539; https://doi.org/10.1117/12.457539


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