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Title:
A Statistical Study of Multiply Imaged Systems in the Lensing Cluster Abell 68
Authors:
Richard, Johan; Kneib, Jean-Paul; Jullo, Eric; Covone, Giovanni; Limousin, Marceau; Ellis, Richard; Stark, Daniel; Bundy, Kevin; Czoske, Oliver; Ebeling, Harald; Soucail, Geneviève
Affiliation:
AA(Department of Astronomy, California Institute of Technology, Pasadena, CA 91125; , , , .), AB(Department of Astronomy, California Institute of Technology, Pasadena, CA 91125; , , , .; OAMP, Laboratoire d'Astrophysique de Marseille, Marseille, France; .), AC(European Southern Observatory, Vitacura, Chile; .; OAMP, Laboratoire d'Astrophysique de Marseille, Marseille, France; .), AD(INAF-Osservatorio Astronomico di Capodimonte, 80131 Naples, Italy; .), AE(Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen; .), AF(Department of Astronomy, California Institute of Technology, Pasadena, CA 91125; , , , .), AG(Department of Astronomy, California Institute of Technology, Pasadena, CA 91125; , , , .), AH(Department of Astronomy, California Institute of Technology, Pasadena, CA 91125; , , , .), AI(Argelander-Institut für Astronomie (Founded by merging of the Institut für Astrophysik und Extraterrestrische Forschung, the Sternwarte, and the Radioastronomisches Institut der Universität Bonn), Universität Bonn, 53121 Bonn, Germany; .), AJ(Institute of Astronomy, University of Hawaii, Honolulu, HI 96822; .), AK(Observatoire Midi-Pyrénées, 31000 Toulouse, France; .)
Publication:
The Astrophysical Journal, Volume 662, Issue 2, pp. 781-796. (ApJ Homepage)
Publication Date:
06/2007
Origin:
UCP
ApJ Keywords:
Cosmology: Observations, galaxies: clusters: individual (A68), Galaxies: High-Redshift, Cosmology: Gravitational Lensing
DOI:
10.1086/517875
Bibliographic Code:
2007ApJ...662..781R

Abstract

We have carried out an extensive spectroscopic survey with the Keck and VLT telescopes, targeting lensed galaxies in the background of the massive cluster Abell 68. Spectroscopic measurements are obtained for 26 lensed images, including a distant galaxy at z=5.4. Redshifts have been determined for 5 out of 7 multiple-image systems. Through a careful modeling of the mass distribution in the strongly lensed regime, we derive a mass estimate of 5.3×1014 Msolar within 500 kpc. Our mass model is then used to constrain the redshift distribution of the remaining multiply imaged and singly imaged sources. This enables us to examine the physical properties for a subsample of 7 Lyα emitters at 1.7<~z<~5.5, whose unlensed luminosities of ~=1041 ergs s-1 are fainter than similar objects found in blank fields. Of particular interest is an extended Lyα emission region surrounding a highly magnified source at z=2.6, detected in VIMOS integral field spectroscopy data. The physical scale of the most distant lensed source at z=5.4 is very small (<300 pc), similar to the lensed z~5.6 emitter reported by Ellis et al. in Abell 2218. New photometric data available for Abell 2218 allow for a direct comparison between these two unique objects. Our survey illustrates the practicality of using lensing clusters to probe the faint end of the z~2-5 Lyα luminosity function in a manner that is complementary to blank-field narrowband surveys.

Data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.

Also based on observations collected at the Very Large Telescope (Antu/UT1 and Melipal/UT3), European Southern Observatory, Paranal, Chile (ESO programs 070.A-0643 and 073.A-0774), the NASA/ESA Hubble Space Telescope (program 8249) obtained at the Space Telescope Science Institute, which is operated by AURA under NASA contract NAS5-26555, and the Canada-France-Hawaii Telescope (CFHT), which is operated by the National Research Council of Canada, the Institut National des Sciences de l'Univers of the Centre National de la Recherche Scientifique of France, and the University of Hawaii.

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