The intense starburst HDF 850.1 in a galaxy overdensity at z ≈ 5.2 in the Hubble Deep Field - Archive ouverte HAL Access content directly
Journal Articles Nature Year : 2012

## The intense starburst HDF 850.1 in a galaxy overdensity at z ≈ 5.2 in the Hubble Deep Field

Fabian Walter
Roberto Decarli
Chris Carilli
Frank Bertoldi
Pierre Cox
Elisabete da Cunha
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Mark Dickinson
Dennis Downes
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David Elbaz
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Richard Ellis
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Jacqueline Hodge
Roberto Neri
Dominik A. Riechers
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Axel Weiss
Eric Bell
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Helmut Dannerbauer
Melanie Krips
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Lindley Lentati
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Karl Menten
Hans-Walter Rix
Brant Robertson
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Dan P. Stark
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Daniel Stern
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#### Abstract

The Hubble Deep Field provides one of the deepest multiwavelength 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. 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 mass. 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 $z \approx$ 5.2, corresponding to a cosmic age of only 1.1 billion years after the Big Bang. This redshift is significantly higher than earlier estimates 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 M$_{sun}$ year$^{-1}$ and is spatially resolved on scales of 5 kiloparsecs, with an implied dynamical mass of about 1.3 × 10$^{11}$ M$_{sun,}$ 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

### Dates and versions

cea-00881166 , version 1 (13-11-2020)

### Identifiers

• HAL Id : cea-00881166 , version 1
• DOI :

### Cite

Fabian Walter, Roberto Decarli, Chris Carilli, Frank Bertoldi, Pierre Cox, et al.. The intense starburst HDF 850.1 in a galaxy overdensity at z ≈ 5.2 in the Hubble Deep Field. Nature, 2012, 486 (7402), pp.233-236. ⟨10.1038/nature11073⟩. ⟨cea-00881166⟩

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