We construct a sample of 70 clusters using data from XMM-Newton and Planck to investigate the Y _ { SZ, \emph { Planck } } \ - - Y _ { SZ, \emph { XMM } } scaling relation and the cool-core influences on the relation . Y _ { SZ, \emph { XMM } } is calculated by accurate de-projected temperature and electron number density profiles derived from XMM-Newton . Y _ { SZ, \emph { Planck } } is the latest Planck data restricted to our precise X-ray size \theta _ { 500 } .
To study the cool-core influences on Y _ { SZ, \emph { Planck } } \ - - Y _ { SZ, \emph { XMM } } scaling relation , we apply two criteria , limits of central cooling time and classic mass deposition rate , to distinguish cool-core clusters ( CCCs ) from non-cool-core clusters ( NCCCs ) .
We also use Y _ { SZ, \emph { Planck } } from other papers , which are derived from different methods , to confirm our results .
The intercept and slope of the Y _ { SZ, \emph { Planck } } \ - - Y _ { SZ, \emph { XMM } } scaling relation are A = -0.86 \pm 0.30 , B = 0.83 \pm 0.06 .
The intrinsic scatter is \sigma _ { ins } = 0.14 \pm 0.03 .
The ratio of Y _ { SZ, \emph { Planck } } / Y _ { SZ, \emph { XMM } } is 1.03 \pm 0.05 , which is perfectly agreed with unity .
Discrepancies of Y _ { SZ, \emph { Planck } } \ - - Y _ { SZ, \emph { XMM } } scaling relation between CCCs and NCCCs are found in observation .
They are independent of cool-core classification criteria and Y _ { SZ, \emph { Planck } } calculation methods , although discrepancies are more significant under the classification criteria of classic mass deposition rate .
The intrinsic scatter of CCCs ( 0.04 ) is quite small compared to that of NCCCs ( 0.27 ) .
The ratio of Y _ { SZ, \emph { Planck } } / Y _ { SZ, \emph { XMM } } for CCCs is 0.89 \pm 0.05 , suggesting that CCCs ’ Y _ { SZ, \emph { XMM } } may overestimate SZ signal .
By contrast , the ratio of Y _ { SZ, \emph { Planck } } / Y _ { SZ, \emph { XMM } } for NCCCs is 1.14 \pm 0.12 , which indicates that NCCCs ’ Y _ { SZ, \emph { XMM } } may underestimate SZ signal .