NOAO >   Observing Info >   Approved Programs >   2010B-0223

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Proposal Information for 2010B-0223


PI: Kathy Romer, University of Sussex, romer@sussex.ac.uk
Address: Astronomy Centre, CPES, Brighton, BN1 9QH, United Kingdom

CoI: Chris Miller, University of Michigan
CoI: Ricardo Ogando, Observatorio Nacional (ON/MCT)
CoI: Matt Hilton, University of KwaZulu-Natal, Durban, South Africa
CoI: Christophe Benoist, Observatoire de la Côte d?Azur
CoI: Chris Collins, Liverpool John Moores University
CoI: Luiz da Costa, Observatorio Nacional (ON/MCT)
CoI: Ed Lloyd-Davies, University of Sussex
CoI: Marcio Maia, Observatorio Nacional (ON/MCT)
CoI: Martin Sahlen, Oskar Klein Centre, University of Stockholm
CoI: Adam Stanford, Lawrence Livermore National Laboratory, UC Davis
CoI: John Stott, Liverpool John Moores University

Title: The Evolution of X-ray Scaling Relations Over Half A Hubble Time

Abstract: The observed evolution of X-ray cluster scaling relations provides a powerful method of discriminating between different models of heating by AGN and/or supernovae ('feedback') within clusters. Understanding the evolution of the cluster physics is not only essential for enabling clusters to provide precision measurements of cosmological parameters, but also places constraints on models of galaxy formation and evolution, in which feedback is now an essential ingredient. The details of feedback by AGN at high redshift may offer an explanation of the low value of sigma8 measured recently by the South Pole Telescope. We propose to obtain spectroscopic redshifts of 12 clusters selected from the XMM Cluster Survey, detected with enough X-ray counts to facillitate temperature measurements, and estimated to lie at redshift 0.7. This will provide the largest such sample to date at this redshift; an epoch where different model predictions diverge significantly. In combination with the complete lower redshift XCS cluster sample with its well defined selection function, the GMOS observations will help to produce the most comprehensive view of X-ray scaling relation evolution yet. This is a resubmission of a 2009B proposal that has been expanded to include additional targets in the Dark Energy Survey region.


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