Evolution of Cluster Scaling Relations with Near-infrared and Spitzer Imaging

Details Evolution of Cluster Scaling Relations with Near-infrared and Spitzer Imaging Evolution of Cluster Scaling Relations with Near-infrared and Spitzer Imaging

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543609s&link_type=abstract

American Astronomical Society, AAS Meeting #215, #436.09; Bulletin of the American Astronomical Society, Vol. 42, p.385

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We present scaling relations for a unique sample of 41 X-ray-selected clusters at moderate redshift (z = 0.35 -- 0.90). Chandra data of the clusters have been used to constrain dark energy (the Chandra Cluster Cosmology Project). We have deep Flamingos/ISPI Ks-band imaging from the NOAO 4m telescopes and mid-infrared IRAC imaging from Spitzer for all 41 clusters. We use these data to estimate the cluster richnesses and stellar masses. We compare these infrared properities to X-ray properties (TX, YX, M500) from Chandra data to measure the evolution of cluster scaling relations and the halo occupation function. Both semi-analytic models and simulations incorporating radiative cooling and galaxy formation overpredict the stellar masses of clusters by a factor of 2-3. Our data will help constrain models of galaxy formation and evolution in clusters. The evolution of cluster scaling relations is an important input for understanding cosmological constraints from future cluster surveys. Companion posters study the evolution of luminosity functions and star formation in these clusters.

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