SIMBAD references

Using Chandra observations, we derive the Y_X proxy and associated total mass measurement, M₅₀₀^Y_X, for 147 clusters with z < 0.35 from the Planck early Sunyaev-Zeldovich catalog, and for 80 clusters with z < 0.22 from an X-ray flux-limited sample. We reextract the Planck Y_SZ measurements and obtain the corresponding mass proxy, M₅₀₀^SZ, from the full Planck mission maps, minimizing Malmquist bias due to observational scatter. The masses reextracted using the more precise X-ray position and characteristic size agree with the published PSZ2 values, but yield a significant reduction in the scatter (by a factor of two) in the M₅₀₀^SZ-M₅₀₀^Y_X relation. The slope is 0.93 ± 0.03, and the median ratio, M₅₀₀^SZ/M₅₀₀^Y_X=0.91±0.01, is within the expectations from known X-ray calibration systematics. Y_SZ/Y_X is 0.88 ± 0.02, in good agreement with predictions from cluster structure, and implying a low level of clumpiness. In agreement with the findings of the Planck Collaboration, the slope of the Y_SZ-D_A^–2Y_X flux relation is significantly less than unity (0.89 ± 0.01). Using extensive simulations, we show that this result is not due to selection effects, intrinsic scatter, or covariance between quantities. We demonstrate analytically that changing the Y_SZ-Y_X relation from apparent flux to intrinsic properties results in a best-fit slope that is closer to unity and increases the dispersion about the relation. The redistribution resulting from this transformation implies that the best-fit parameters of the M₅₀₀^SZ-M₅₀₀^Y_X relation will be sample-dependent.