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 over-all amplitude for the SZ signal at the \sim 8 \sigma level , yielding a combined constraint of f _ { gas } h = 0.08 \pm 0.01 ( ran ) \pm 0.01 ( sys ) on the gas mass fraction of the Intra-Cluster 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 \sigma level , while both show an increasing trend with X-ray temperature .
Nevertheless , our SZ estimated gas fraction is 30 - 40 \% smaller than the concordance \Lambda CDM cosmic average .
We also express our observations in terms of the SZ flux-temperature relation , and compare it with other observations , as well as numerical studies .

Based on its spectral and spatial signature , we can also extract the microwave point source signal of the clusters at the 3 \sigma level , which puts the average microwave luminosity ( at \sim 41 GHz ) of bright cluster members ( M _ { K } \leq - 21 ) at ( 2.4 \pm 0.8 ) \times 10 ^ { 27 } h ^ { -2 } { erg / s / Hz } .
Furthermore , we can constrain the average dark matter halo concentration parameter to c _ { vir } = 3.4 ^ { +0.6 } _ { -0.9 } , for clusters with T _ { x } > 5 ~ { } { keV } .

Our work serves as an example for how correlation of SZ surveys with cluster surveys in other frequencies can significantly increase our physical understanding of the intra-cluster medium .