2007

Spectroscopic follow-up of a cluster candidate at z = 1.45

van Breukelen, Caroline, Cotter, Garret, Rawlings, Steve et al.

Understand

We have obtained deep optical spectroscopic data of the highest-redshift cluster candidate (z ~ 1.4, CVB13) selected by Van Breukelen et al.

  • (2006) in a photometric optical/infrared catalogue of the Subaru XMM-Newton Deep Field.
  • The data, which comprise 104 targeted galaxies, were taken with the DEep Imaging Multi-Object Spectrograph (DEIMOS) on the Keck 2 telescope and yielded 31 secure redshifts in the range 1.25 < z < 1.54 within a 7' x 4' field centred on CVB13.
  • Instead of one massive cluster at z = 1.4, we find evidence for three projected structures at z = 1.40, z = 1.45, and z = 1.48.

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