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The XMM Cluster Survey: Optical analysis methodology and the first data release

Research output: Contribution to journalJournal articlepeer-review

  • Nicola Mehrtens
  • A. Kathy Romer
  • Matt Hilton
  • E. J. Lloyd-Davies
  • Christopher J. Miller
  • S. A. Stanford
  • Mark Hosmer
  • Ben Hoyle
  • Chris A. Collins
  • Andrew R. Liddle
  • Pedro T P Viana
  • Robert C. Nichol
  • E. Naomi Dubois
  • Scott T. Kay
  • Martin Sahlén
  • Owain Young
  • C. J. Short
  • L. Christodoulou
  • William A. Watson
  • Michael Davidson
  • Craig D. Harrison
  • Leon Baruah
  • Mathew Smith
  • Claire Burke
  • Julian A. Mayers
  • Paul James Deadman
  • Philip J. Rooney
  • Edward M. Edmondson
  • Michael West
  • Heather C. Campbell
  • Alastair C. Edge
  • Robert G. Mann
  • Kivanc Sabirli
  • David Wake
  • Christophe Benoist
  • Luiz da Costa
  • Marcio A G Maia
  • Ricardo Ogando
<mark>Journal publication date</mark>21/06/2012
<mark>Journal</mark>Monthly Notices of the Royal Astronomical Society
Issue number2
Number of pages29
Pages (from-to)1024-1052
Publication StatusPublished
Early online date8/06/12
<mark>Original language</mark>English


The XMM Cluster Survey (XCS) is a serendipitous search for galaxy clusters using all publicly available data in the XMM-Newton Science Archive. Its main aims are to measure cosmological parameters and trace the evolution of X-ray scaling relations. In this paper we present the first data release from the XMM Cluster Survey (XCS-DR1). This consists of 503 optically confirmed, serendipitously detected, X-ray clusters. Of these clusters, 256 are new to the literature and 357 are new X-ray discoveries. We present 463 clusters with a redshift estimate (0.06 <z <1.46), including 261 clusters with spectroscopic redshifts. The remainder have photometric redshifts. In addition, we have measured X-ray temperatures (TX) for 401 clusters (0.4 <TX <14.7keV). We highlight seven interesting subsamples of XCS-DR1 clusters: (i) 10 clusters at high redshift (z > 1.0, including a new spectroscopically confirmed cluster at z= 1.01); (ii) 66 clusters with high TX (>5keV); (iii) 130 clusters/groups with low TX (X values in the Sloan Digital Sky Survey (SDSS) 'Stripe 82' co-add region; (v) 77 clusters with measured TX values in the Dark Energy Survey region; (vi) 40 clusters detected with sufficient counts to permit mass measurements (under the assumption of hydrostatic equilibrium); (vii) 104 clusters that can be used for applications such as the derivation of cosmological parameters and the measurement of cluster scaling relations. The X-ray analysis methodology used to construct and analyse the XCS-DR1 cluster sample has been presented in a companion paper, Lloyd-Davies et al.