SZ clusters surveys like 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 } – Y _ { X } scaling relation .
We constrain the amplitude , slope , and scatter of the Y _ { SZ } – Y _ { X } scaling relation using SZ data from Planck and X-ray data from Chandra .
We find a best fit amplitude of \ln ( D _ { A } ^ { 2 } Y _ { SZ } / CY _ { X } ) = -0.202 \pm 0.024 at the pivot point CY _ { X } = 8 \times 10 ^ { -5 } \mbox { Mpc } ^ { 2 } .
This corresponds to a Y _ { SZ } / Y _ { X } -ratio of 0.82 \pm 0.024 , in good agreement with X-ray expectations after including the effects of gas clumping .
The slope of the relation is \alpha = 0.916 \pm 0.032 , consistent with unity at \approx 2.3 \sigma .
We are unable to detect intrinsic scatter , and find no evidence that the scaling relation depends on cluster dynamical state .