Program: GN-2006A-Q-18

Title:The first high-redshift clusters from the UKIDSS-DXS
PI:Alastair Edge
Co-I(s): Matt Jarvis, Seb Oliver, Caroline van Breukelen, Steve Rawlings, Lee Clewley, John Stott, Ian Waddington, Eduardo Gonzales-Solares, Malcolm Bremer, Meghan Gray, Omar Almaini, Chris Simpson, Ian Smail, Mark Swinbank, Martin Ward, Garret Cotter, Paul Hirst, Rob Ivison, Steve Eales, Aprijita Verma, Toru Yamada, Jacqueline Bergeron, Alain Omont, Payam Davoodi, Jason Surace, Dave Shupe, UKIDSS DXS Working Group

Abstract

The UKIRT wide-field camera is now in full operation and UKIDSS is underway. Here we are proposing to obtain multi-object spectroscopy of the first high-redshift cluster candidates from the Deep Extragalactic Survey (DXS) as part of this public survey and make the results available immediately. Science Verification data along with deep Spitzer and wide-field optical imaging over the Elais N1 field, has enabled us to select a sample of clusters consistent with being at 0.8 < z < 1.2. GMOS will enable us to measure the velocity dispersion of clusters, and therefore their mass, selected via their infrared and optical colours, thus providing a unique sample which can be compared with clusters found in other ways, e.g. X-rays. With the deep, mid-infrared observations from the Spitzer-SWIRE survey over ELAIS-N1, we will also be able to test whether there are preferred sites within the clusters that have ongoing star-formation and/or AGN activity. Thus, these observation will provide the crucial data for investigating the first high-redshift (z>1) clusters NOT selected in the X-ray waveband.

Publications using this program's data