Skip to content
DraconiticResearch
Search Sources API
203,203 studies31 sourcesUpdated 42 min ago
PreprintCC BY 4.0arXiv

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

  • J. E. Pilling
  • D. J. Turner
  • P. A. Giles
  • A. K. Romer
  • R. Wilkinson
  • P. J. Rooney
  • M. Hilton
  • S. Bhargava
  • J. Hall
  • R. Wang
  • A. Abdulghafour
  • B. J. Maughan
Open at sourcePDFDOICite

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.

Related

  1. The SRG/eROSITA All-Sky Survey. Early dark energy and Hubble constant from the cluster mass function
    J. Strunk, E. Artis, E. Bulbul +23
    Astronomy & AstrophysicsPeer-reviewedPublisher termsCosmologyCrossref
  2. A census of Dark Energy Survey Year 3 redMaPPer galaxy clusters in a high exposure eROSITA All Sky Survey region
    P.A Giles, A.K Romer, J Pilling +64
    Mon.Not.Roy.Astron.Soc.Peer-reviewedCC BY 4.0Full textCosmologyGeneral physicsHALarXiv
  3. The SRG/eROSITA All-Sky Survey: Early dark energy and Hubble constant from the cluster mass function
    J Strunk, E Artis, E Bulbul +23
    HALPreprintarXiv licenceFull textCosmologyGeneral physicsHALarXiv
  4. The Next Generation Virgo Cluster Survey (NGVS). XXIX. Demography of Nuclear Star Clusters
    Max M. Kurzner, Patrick Côté, Laura Ferrarese +15
    arXivPreprintCC BY 4.0Full textGalaxiesarXiv
  5. Extracting intrinsic alignments in the Dark Energy Survey’s year 1 data, using the self-calibration method and LSST-DESC tools
    Eske M Pedersen, Leonel Medina-Varela, Emily Phillips Longley +4
    Monthly Notices of the Royal Astronomical SocietyPeer-reviewedCC BY 4.0Full textSolar & stellar physicsCrossref

Cite

BibTeXRIS
BibTeX
@misc{pilling2026cluster,
  title = {{The XMM Cluster Survey: Cross-Calibration of eROSITA and XMM using Dark Energy Survey Y3 Galaxy Clusters}},
  author = {J. E. Pilling and D. J. Turner and P. A. Giles and A. K. Romer and R. Wilkinson and P. J. Rooney and M. Hilton and S. Bhargava and J. Hall and R. Wang and A. Abdulghafour and B. J. Maughan},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.16741},
  eprint = {2610.16741},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.16741},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - The XMM Cluster Survey: Cross-Calibration of eROSITA and XMM using Dark Energy Survey Y3 Galaxy Clusters
AU  - J. E. Pilling
AU  - D. J. Turner
AU  - P. A. Giles
AU  - A. K. Romer
AU  - R. Wilkinson
AU  - P. J. Rooney
AU  - M. Hilton
AU  - S. Bhargava
AU  - J. Hall
AU  - R. Wang
AU  - A. Abdulghafour
AU  - B. J. Maughan
PY  - 2026
DA  - 2026/10/12
PB  - arXiv
DO  - 10.48550/arxiv.2610.16741
UR  - https://arxiv.org/abs/2610.16741
AB  - 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 L_X,soft-λ_RM and T_X-λ_RM scaling relations for both eROSITA and XMM using the same cluster sample, finding minimal differences in the L_X,soft-λ_RM relation but a clear normalisation offset in the T_X-λ_RM relation, particularly for the highest richness systems. This study will enable future work combining eROSITA and XMM observatories for DESY3RM clusters.
ER  -