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Proceedings Paper

Ultradeep near-infrared imaging of HDF-south: rest-frame optical properties of high redshift galaxies
Author(s): Ivo Labbe; Marijn Franx; Gregory Rudnick; Alan F. M. Moorwood; Natascha Foerster Schreiber; Hans-Walter Rix; Lottie van Starkenburg; Peter van Dokkum; Paul P. van der Werf; Huub J. A. Roettgering; Konrad Kuijken
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Paper Abstract

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.

Paper Details

Date Published: 13 February 2003
PDF: 8 pages
Proc. SPIE 4834, Discoveries and Research Prospects from 6- to 10-Meter-Class Telescopes II, (13 February 2003);
Show Author Affiliations
Ivo Labbe, Leiden Observatory (Netherlands)
Marijn Franx, Leiden Observatory (Netherlands)
Gregory Rudnick, Max-Planck-Institut fuer Astrofisica (Germany)
Alan F. M. Moorwood, European Southern Observatory (Germany)
Natascha Foerster Schreiber, Leiden Observatory (Netherlands)
Hans-Walter Rix, Max-Planck-Institut fuer Astronomie (Germany)
Lottie van Starkenburg, Leiden Observatory (Netherlands)
Peter van Dokkum, California Institute of Technology (United States)
Paul P. van der Werf, Leiden Observatory (Netherlands)
Huub J. A. Roettgering, Leiden Observatory (Netherlands)
Konrad Kuijken, Leiden Observatory (Netherlands)

Published in SPIE Proceedings Vol. 4834:
Discoveries and Research Prospects from 6- to 10-Meter-Class Telescopes II
Puragra Guhathakurta, Editor(s)

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