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Title:
Deep Keck u-Band Imaging of the Hubble Ultra Deep Field: A Catalog of z ~ 3 Lyman Break Galaxies
Authors:
Rafelski, Marc; Wolfe, Arthur M.; Cooke, Jeff; Chen, Hsiao-Wen; Armandroff, Taft E.; Wirth, Gregory D.
Affiliation:
AA(Department of Physics and Center for Astrophysics and Space Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0424, USA ), AB(Department of Physics and Center for Astrophysics and Space Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0424, USA ), AC(The Center for Cosmology and the Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA ), AD(Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637, USA ), AE(W. M. Keck Observatory, 65-1120 Mamalahoa Highway, Kamuela, HI 96743, USA ), AF(W. M. Keck Observatory, 65-1120 Mamalahoa Highway, Kamuela, HI 96743, USA )
Publication:
The Astrophysical Journal, Volume 703, Issue 2, pp. 2033-2050 (2009). (ApJ Homepage)
Publication Date:
10/2009
Origin:
IOP
ApJ Keywords:
cosmology: observations, galaxies: distances and redshifts, galaxies: evolution, galaxies: general, galaxies: high-redshift, galaxies: photometry
DOI:
10.1088/0004-637X/703/2/2033
Bibliographic Code:
2009ApJ...703.2033R

Abstract

We present a sample of 407 z ~ 3 Lyman break galaxies (LBGs) to a limiting isophotal u-band magnitude of 27.6 mag in the Hubble Ultra Deep Field. The LBGs are selected using a combination of photometric redshifts and the u-band drop-out technique enabled by the introduction of an extremely deep u-band image obtained with the Keck I telescope and the blue channel of the Low Resolution Imaging Spectrometer. The Keck u-band image, totaling 9 hr of integration time, has a 1σ depth of 30.7 mag arcsec-2, making it one of the most sensitive u-band images ever obtained. The u-band image also substantially improves the accuracy of photometric redshift measurements of ~50% of the z ~ 3 LBGs, significantly reducing the traditional degeneracy of colors between z ~ 3 and z ~ 0.2 galaxies. This sample provides the most sensitive, high-resolution multi-filter imaging of reliably identified z ~ 3 LBGs for morphological studies of galaxy formation and evolution and the star formation efficiency of gas at high redshift.
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