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We use Dark Energy Survey Year 3 (DES Y3) clusters with archival X-ray datafrom XMM-Newton and Chandra to assess the centering performance of theredMaPPer cluster finder and to measure key richness observable scalingrelations. In terms of centering, we find that 10-20% of redMaPPer clusters aremiscentered with no significant difference in bins of low versus high richness($20<\lambda<40$ and $\lambda>40$) or redshift ($0.2<z<0.4$ and $0.4 <z <0.65$). We also investigate the richness bias induced by miscentering. Thedominant reasons for miscentering include masked or missing data and thepresence of other bright galaxies in the cluster; for half of the miscenteredclusters the correct central was one of the other possible centrals identifiedby redMaPPer, while for $\sim 40$% of miscentered clusters the correct centralis not a redMaPPer member with most of these cases due to masking. In addition,we fit the scaling relations between X-ray temperature and richness and betweenX-ray luminosity and richness. We find a T$_X$-$\lambda$ scatter of $0.21 \pm0.01$. While the scatter in T$_X$-$\lambda$ is consistent in bins of redshift,we do find modestly different slopes with high-redshift clusters displaying asomewhat shallower relation. Splitting based on richness, we find a marginallylarger scatter for our lowest richness bin, $20 < \lambda < 40$. The X-rayproperties of detected, serendipitous clusters are generally consistent withthose for targeted clusters, but the depth of the X-ray data for undetectedclusters is insufficient to judge whether they are X-ray underluminous in allbut one case.

Dark Energy Survey Year 3 Results: Mis-centering calibration and X-ray-richness scaling relations in redMaPPer clusters