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- W1997796571 abstract "We devise a Monte Carlo-based, optimized filter match method to extract the thermal Sunyaev-Zel'dovich (SZ) signature of a catalog of 116 low-redshift X-ray clusters from the first-year data release of the Wilkinson Microwave Anisotropy Probe (WMAP). We detect an overall amplitude for the SZ signal at the ~8 σ level, yielding a combined constraint of fgash = 0.08 ± 0.01(ran) ± 0.01(sys) on the gas mass fraction of the intracluster medium. We also compile X-ray-estimated gas fractions from the literature for our sample and find that they are consistent with the SZ estimates at the 2 σ level, while both show an increasing trend with X-ray temperature. Nevertheless, our SZ estimated gas fraction is 30%-40% smaller than the concordance ΛCDM cosmic average. We also express our observations in terms of the SZ flux-temperature relation and compare it with other observations, as well as with numerical studies. Based on its spectral and spatial signature, we can also extract the microwave point-source signal of the clusters at the 3 σ level, which puts the average microwave luminosity (at ~41 GHz) of bright cluster members (MK ≤ -21) at (2.4 ± 0.8) × 1027 h-2 ergs s-1 Hz-1. Furthermore, we can constrain the average dark matter halo concentration parameter to cvir = 3.4 for clusters with TX > 5 keV. Our work serves as an example for how correlation of SZ surveys with cluster surveys at other frequencies can significantly increase our physical understanding of the intracluster medium." @default.
- W1997796571 created "2016-06-24" @default.
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- W1997796571 date "2005-08-10" @default.
- W1997796571 modified "2023-09-23" @default.
- W1997796571 title "Wilkinson Microwave Anisotropy ProbeConstraints on the Intracluster Medium" @default.
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- W1997796571 doi "https://doi.org/10.1086/431274" @default.
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