Journal
ASTROPHYSICAL JOURNAL
Volume 665, Issue 2, Pages 911-920Publisher
IOP PUBLISHING LTD
DOI: 10.1086/519447
Keywords
cosmic microwave background; cosmology : observations; galaxies : clusters : general hydrodynamics; methods : numerical
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We have analyzed a large sample of numerically simulated clusters to demonstrate the adverse effects resulting from the use of X-ray-fitted beta-model parameters with Sunyaev-Zeldovich effect (SZE) data. There is a fundamental incompatibility between beta-model fits to X-ray surface brightness profiles and those done with SZE profiles. Since observational SZE radial profiles are in short supply, the X-ray parameters are often used in SZE analysis. We show that this leads to biased estimates of the integrated Compton y-parameter inside r(500) calculated from clusters. We suggest a simple correction of the method, using a nonisothermal beta-model modified by a universal temperature profile, which brings these calculated quantities into closer agreement with the true values.
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