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The discovery of a massive supercluster at z=0.9 in the UKIDSS Deep eXtragalactic Survey

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Published
  • A. M. Swinbank
  • A. C. Edge
  • Ian Smail
  • M. Bremer
  • Y. Sato
  • C. van Breukelen
  • M. Jarvis
  • I. Waddington
  • L. Clewley
  • J. Bergeron
  • G. Cotter
  • S. Dye
  • J. E. Geach
  • E. Gonzalez-Solares
  • P. Hirst
  • R. J. Ivison
  • S. Rawlings
  • C. Simpson
  • G. P. Smith
  • A. Verma
  • T. Yamada
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<mark>Journal publication date</mark>21/08/2007
<mark>Journal</mark>Monthly Notices of the Royal Astronomical Society
Issue number4
Volume379
Number of pages9
Pages (from-to)1343-1351
Publication StatusPublished
Early online date26/07/07
<mark>Original language</mark>English

Abstract

We analyse the first publicly released deep field of the UK Infrared Deep Sky Survey (UKIDSS) Deep eXtragalactic Survey to identify candidate galaxy overdensities at z similar to 1 across similar to 1 deg(2) in the ELAIS-N1 field. Using I - K, J - K and K - 3.6 mu m colours, we identify and spectroscopically follow up five candidate structures with Gemini/Gemini Multi-Object Spectrograph and confirm that they are all true overdensities with between five and 19 members each. Surprisingly, all five structures lie in a narrow redshift range at z = 0.89 +/- 0.01, although they are spread across 30 Mpc on the sky. We also find a more distant overdensity at z = 1.09 in one of the spectroscopic survey regions. These five overdense regions lying in a narrow redshift range indicate the presence of a supercluster in this field and by comparing with mock cluster catalogues from N-body simulations we discuss the likely properties of this structure. Overall, we show that the properties of this supercluster are similar to the well-studied Shapley and Hercules superclusters at lower redshift.