We present scaling relations between the integrated Sunyaev-Zel ’ dovich Effect ( SZE ) signal , Y _ { SZ } , its X-ray analogue , Y _ { X } \equiv M _ { gas } T _ { X } , and total mass , M _ { tot } , for the 45 galaxy clusters in the Bolocam X-ray-SZ ( BOXSZ ) sample .
All parameters are integrated within r _ { 2500 } . Y _ { 2500 } values are measured using SZE data collected with Bolocam , operating at 140 GHz at the Caltech Submillimeter Observatory ( CSO ) .
The temperature , T _ { X } , and mass , M _ { gas, 2500 } , of the intracluster medium are determined using X-ray data collected with Chandra , and M _ { tot } is derived from M _ { gas } assuming a constant gas mass fraction .
Our analysis accounts for several potential sources of bias , including : selection effects , contamination from radio point sources , and the loss of SZE signal due to noise filtering and beam-smoothing effects .
We measure the Y _ { 2500 } – Y _ { X } scaling to have a power-law index of 0.84 \pm 0.07 , and a fractional intrinsic scatter in Y _ { 2500 } of ( 21 \pm 7 ) \% at fixed Y _ { X } , both of which are consistent with previous analyses .
We also measure the scaling between Y _ { 2500 } and M _ { 2500 } , finding a power-law index of 1.06 \pm 0.12 and a fractional intrinsic scatter in Y _ { 2500 } at fixed mass of ( 25 \pm 9 ) \% .
While recent SZE scaling relations using X-ray mass proxies have found power-law indices consistent with the self-similar prediction of 5/3 , our measurement stands apart by differing from the self-similar prediction by approximately 5 \sigma .
Given the good agreement between the measured Y _ { 2500 } – Y _ { X } scalings , much of this discrepancy appears to be caused by differences in the calibration of the X-ray mass proxies adopted for each particular analysis .