CLASH: Are Galaxy Cluster Cores Denser In Nature Than In Simulations? New Results For Abell 2261 Based On 16-band Hubble Imaging And Lensing, X-ray, And Dynamical Analyses.

Details CLASH: Are Galaxy Cluster Cores Denser In Nature Than In Simulations? New Results For Abell 2261 Based On 16-band Hubble Imaging And Lensing, X-ray, And Dynamical Analyses. CLASH: Are Galaxy Cluster Cores Denser In Nature Than In Simulations? New Results For Abell 2261 Based On 16-band Hubble Imaging And Lensing, X-ray, And Dynamical Analyses.

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21922302c&link_type=abstract

American Astronomical Society, AAS Meeting #219, #223.02

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The best studied galaxy clusters appear to harbor denser cores than their counterparts realized in simulations. This suggests earlier formation times with possible cosmological implications, perhaps leading to clues regarding the nature of dark energy. However, the observational constraints must be strengthened by studying a larger and less biased cluster sample. This is one of the primary science goals of CLASH, The Cluster Lensing and Supernova survey with Hubble. Based on our 16-band Hubble imaging, we are performing detailed strong lensing analyses to map mass within the cores of 25 clusters. Our observations of Abell 2261 have enabled us to identify for the first time galaxies strongly lensed and multiply-imaged by this cluster. We combine this with revised modeling of the weak gravitational lensing observed at larger radii in Subaru imaging. Based on our lensing, X-ray, and dynamical analyses, we derive the mass profile of Abell 2261 and compare its core density concentration to clusters of similar mass formed in simulations. We include novel estimates of important systematic uncertainties such as cluster elongation (triaxiality) and additional massive structures along our line of sight.

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