Result: The intense starburst HDF 850.1 in a galaxy overdensity at z ≈ 5.2 in the Hubble Deep Field
National Radio Astronomy Observatory, Pete V.Domenici Array Science Center, PO Box O, Socorro, New Mexico 87801, United States
Astronomy Department, California Institute of Technology, MC105-24, Pasadena, California 91125, United States
IRAM, 300 rue de la Piscine, 38406 Saint-Martin d'Hères, France
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, Michigan 48109, United States
Universität Wien, Institut für Astronomie, Türkenschanzstrasse 17, 1080 Wien, Austria
Department of Astronomy and Astrophysics, University of California, Santa Cruz, California 95064, United States
Cavendish Laboratory, University of Cambridge, 19 JJ Thomson Avenue, Cambridge CB3 0HF, United Kingdom
INAF-Osservatorio Astronomico di Roma, via di Frascati 33, 00040 Monte Porzio Catone, Italy
Department of Astronomy, University of California at Berkeley, Berkeley, California 94720, United States
Department of Astronomy, University of Arizona, 933 North Cherry Avenue, Tucson, Arizona 85721, United States
Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States
Argelan der Institute for Astronomy, University of Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, Irfu/Service d'Astrophysique, CEA Saclay, Orme des Merisiers, 91191 Gif-sur-Yvette, France
National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, Arizona 85719, United States
CC BY 4.0
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Further Information
The Hubble Deep Field provides one of the deepest multiwave-length views of the distant Universe and has led to the detection of thousands of galaxies seen throughout cosmic time'. An early map of the Hubble Deep Field at a wavelength of 850 micrometres, which is sensitive to dust emission powered by star formation, revealed the brightest source in the field, dubbed HDF 850.1 (ref. 2). For more than a decade, and despite significant efforts, no counterpart was found at shorter wavelengths, and it was not possible to determine its redshift, size or mass3―7. Here we report a redshift of z = 5.183 for HDF 850.1, from a millimetre-wave molecular line scan. This places HDF 850.1 in a galaxy overdensity at z ≈ 5.2, corresponding to a cosmic age of only 1.1 billion years after the Big Bang. This redshift is significantly higher than earlier estimates3,4,6,8 and higher than those of most of the hundreds of submillimetre-bright galaxies identified so far. The source has a star-formation rate of 850 solar masses per year and is spatially resolved on scales of 5 kiloparsecs, with an implied dynamical mass of about 1.3 x 1011 solar masses, a significant fraction of which is present in the form of molecular gas. Despite our accurate determination of redshift and position, a counterpart emitting starlight remains elusive.