Mathematics – Logic
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1333w&link_type=abstract
American Astronomical Society, HEAD meeting #9, #13.33; Bulletin of the American Astronomical Society, Vol. 38, p.371
Mathematics
Logic
Scientific paper
As measurements of the Cosmic Microwave Background radiation become more precise, large numbers of massive galaxy clusters will be detected via the Sunyaev-Zel'dovich effect (SZE). These samples have the power to probe the growth of large scale structure and evolution of dark energy at larger redshifts than is currently possible due to the SZE's effective redshift independence. However, cluster mass, which is derived from the y-parameter, depends on the assumption of virial equilibrium. This assumption does not hold during merger events. We employ hydrodynamical/N-body simulations of cluster mergers (Ricker & Sarazin 2001) to quantify the effect of this assumption. We find that a merger induces a boost to the observed y-parameter of the SZE, which leads to an overestimate of the mass present in the system. The cumulative effect of these boosts will affect the inferred mass function. Following the treatment of X-ray merger boosts by Randall, Sarazin, & Ricker (2002), we assess the effect of merger boosts on the inferred mass function of clusters, the determination of the cosmological parameters σ8 and Ω0, and the evolution of dark energy.
Support for this work was provided by the National Aeronautics and Space Administration primarily through Chandra awards GO4-5137X, GO4-5133X, and GO5-6126X, issued by the Chandra X-ray Observatory, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of NASA under contract NAS8-39073, and through NASA XMM-Newton awards NNG04GO34G, NNG04GP46G, NNG05GA34G, and NNG06GD54G.
Randall Scott W.
Ricker Paul M.
Sarazin Craig L.
Wik Daniel R.
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