The XMM Cluster Survey: Cross-Calibration of eROSITA and XMM using Dark Energy Survey Y3 Galaxy Clusters

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ID: 332610
2026
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Abstract
Abstract We present the cross-calibration of the eROSITA and XMM telescopes, using galaxy clusters detected by redMaPPer from the first three years of Dark Energy Survey observations (DESY3RM). We use the X-ray: Generate and Analyse (Xga) Python module to measure eROSITA properties, and validate our methodology using a deep pointed eROSITA CAL-PV observation of A3158, and a sample of 119 clusters from the expanded HIgh FLux Galaxy Cluster Sample (eeHiFLUGCS). Next, we construct a sample of DESY3RM clusters matched to XMM observations analysed by the XMM Cluster Survey (XCS), and to clusters in the first release of the eROSITA All-Sky Survey (eRASS1). This produced a sample of 114 DESY3RM clusters with both XMM and eROSITA detections. Our resulting X-ray temperatures determined from eROSITA were compared to eRASS1 catalogue values, showing consistency between the two analyses. Comparisons between XMM and eROSITA temperatures reveal a systematic offset, with XMM temperatures 28 ± 7% higher on average. Finally, we fit LX, soft-λRM and TX-λRM scaling relations for both eROSITA and XMM using the same cluster sample, finding minimal differences in the LX, soft-λRM relation but a clear normalisation offset in the TX-λRM relation, particularly for the highest richness systems. This study will enable future work combining eROSITA and XMM observatories for DESY3RM clusters.
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Authors J E Pilling, D J Turner, Paul A Giles, A. Kathy Romer, R. D. Wilkinson, P. Rooney, Matt Hilton, S Bhargava, J Hall, Ray Wang, A Abdulghafour, Ben J. Maughan
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1968
URL
https://doi.org/10.1093/mnras/stag1968
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