Cluster Of Galaxies: Lensing And X-ray Mass Estimates, C-m Relation

Details Cluster Of Galaxies: Lensing And X-ray Mass Estimates, C-m Relation Cluster Of Galaxies: Lensing And X-ray Mass Estimates, C-m Relation

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21933825r&link_type=abstract

American Astronomical Society, AAS Meeting #219, #338.25

Physics

Scientific paper

We present a comparison between weak-lensing and X-ray mass estimates of a sample of numerically simulated clusters. The sample consists of 20 massive systems at redhisft z=0.25 and virial mass above 5 × 1014 Msun h-1. Each cluster has been resimulated at higher resolution and with more complex gas physics. We processed it through through Skylens and X-MAS to create optical and X-ray mock observations along three orthogonal projections. Standard observational tools and methods are used to recover the mass profiles of each cluster projection from the mock catalogues. The resulting mass profiles from lensing and X-ray are individually compared to the input mass distributions to test the reliability of the mass measurements. Given the size of our sample, we could also investigate the dependence of the results on cluster morphology, environment, temperature inhomogeneity, and mass. We confirm previous results showing that lensing masses obtained from the fit of the cluster tangential shear profiles are biased low by 10% and that X-ray masses are affected by both lack of hydrostatic equilibrium and temperature inhomogeneity. The same sample is used to derive the concentration mass relation, that we subsequently compare with the intrinsic one.

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