The XMM Cluster Survey: an independent demonstration of the fidelity of the eFEDS galaxy cluster data products and implications for future studies

Turner, D. J.; Giles, P. A.; Romer, A. K.; Wilkinson, R.; Upsdell, E. W.; Klein, M.; Viana, P. T. P.; Hilton, M.; Bhargava, S.; Collins, C. A.; Mann, R. G.; Sahlen, M. und Stott, J. P. (2022): The XMM Cluster Survey: an independent demonstration of the fidelity of the eFEDS galaxy cluster data products and implications for future studies. In: Monthly Notices of the Royal Astronomical Society, Bd. 517, Nr. 1: S. 657-674

Abstract

We present the first comparison between properties of clusters of galaxies detected by the eROSITA Final Equatorial-Depth Survey (eFEDS) and the XMM Cluster Survey (XCS). We have compared, in an ensemble fashion, properties from the eFEDS X-ray cluster catalogue with those from the Ultimate XMM eXtragaLactic (XXL) survey project (XXL-100-GC). We find the redshift and temperature (T-X) distributions to be similar, with a larger proportion of clusters above 4 keV in the XXL-100-GC sample;fractional temperature uncertainties are significantly larger in eFEDS compared to XXL. We find 62 eFEDS cluster candidates with XMM data (eFEDS-XMM sample);10 do not have good enough XMM data to confirm or deny, 11 are classed as sample contaminants, and 4 have their X-ray flux contaminated by another source. The majority of eFEDS-XMM sources have longer XMM exposures than eFEDS, and most eFEDS positions are within 100 kpc of XCS positions. Our eFEDS-XCS sample of 37 clusters is used to calculate minimum sample contamination fractions of similar to 18 and similar to 9 per cent in the eFEDS X-ray and optically confirmed samples, respectively, in general agreement with eFEDS findings. We directly compare 29 X-ray luminosities (L-X) measured by eFEDS and XCS, finding excellent agreement. Eight clusters have a T-X measured by XCS and eFEDS, and we find that XMM temperatures are 25 +/- 9 per cent larger than their eROSITA counterparts. Finally, we construct L-X-T-X scaling relations based on eFEDS and XCS measurements, which are in tension;the tension is decreased when we measure a third scaling relation with calibrated XCS temperatures.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0035-8711
• Sprache: Englisch