Sunyaev-Zeldovich (SZ) clusters surveys, such as Planck, the South Pole Telescope, and the Atacama Cosmology Telescope, will soon be publishing several hundred SZ-selected systems. The key ingredient required to transport the mass calibration from current X-ray-selected cluster samples to these SZ systems is the Y SZ-YX scaling relation. We constrain the amplitude, slope, and scatter of the Y SZ-YX scaling relation using SZ data from Planck and X-ray data from Chandra. We find a best-fit amplitude of ln (D 2 A Y SZ/CYX ) = -0.202 ± 0.024 at the pivot point CYX = 8 × 10-5 Mpc2. This corresponds to a Y SZ/YX ratio of 0.82 ± 0.024, in good agreement with X-ray expectations after including the effects of gas clumping. The slope of the relation is ? = 0.916 ± 0.032, consistent with unity at ?2.3?. We are unable to detect intrinsic scatter, and find no evidence that the scaling relation depends on cluster dynamical state.
