Spectroscopic confirmation of a galaxy at redshift z = 8.6

M. D. Lehnert (), N. P. H. Nesvadba (), J.-G. Cuby, A. M. Swinbank, Sebastian Morris (), B. Clément, C. J. Evans, M. N. Bremer and S. Basa
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M. D. Lehnert: GEPI, Observatoire de Paris, CNRS, Université Paris Diderot, 5 Place Jules Janssen, 92190 Meudon, France
N. P. H. Nesvadba: Institut d’Astrophysique Spatiale, UMR 8617, CNRS, Université Paris-Sud, Bâtiment 121, F-91405 Orsay Cedex, France
J.-G. Cuby: Laboratoire d’Astrophysique de Marseille, OAMP, Universit Aix-Marseille & CNRS 38 Rue Frédéric Joliot Curie
A. M. Swinbank: Institute for Computational Cosmology, Durham University
B. Clément: Laboratoire d’Astrophysique de Marseille, OAMP, Universit Aix-Marseille & CNRS 38 Rue Frédéric Joliot Curie
C. J. Evans: UK Astronomy Technology Centre, Royal Observatory
M. N. Bremer: H. H. Wills Physics Laboratory
S. Basa: Laboratoire d’Astrophysique de Marseille, OAMP, Universit Aix-Marseille & CNRS 38 Rue Frédéric Joliot Curie

Nature, 2010, vol. 467, issue 7318, 940-942

Abstract: A galaxy at redshift z ≈ 8.6 Until now, the most distant spectroscopically confirmed galaxies known in the Universe were at redshifts z ≈ 8.2 and z ≈ 6.96. Lehnert et al. now report that UDFy-38135539 is at a redshift of z = 8.6. The galaxy was first identified as a candidate z ≈ 8.6 object in deep Wide Field Camera 3 observations of the Hubble Ultra Deep Field, and the discovery in ground-based observations that it is emitting Lyman-α photons provides confirmation. This single source is unlikely to provide enough photons to ionize the volume necessary for the emission line to escape, requiring a significant contribution from other, probably fainter galaxies nearby.

Date: 2010
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DOI: 10.1038/nature09462

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