The XMM Cluster Survey : Exploring scaling relations and completeness of the Dark Energy Survey Year 3 redMaPPer cluster catalogue

Upsdell, E W and Giles, P A and Romer, A K and Wilkinson, R and Turner, D J and Hilton, M and Rykoff, E and Farahi, A and Bhargava, S and Jeltema, T and Klein, M and Bermeo, A and Collins, C A and Ebrahimpour, L and Hollowood, D and Mann, R G and Manolopoulou, M and Miller, C J and Rooney, P J and Sahlén, Martin and Stott, J P and Viana, P T P and Allam, S and Alves, O and Bacon, D and Bertin, E and Bocquet, S and Brooks, D and Burke, D L and Kind, M Carrasco and Carretero, J and Costanzi, M and da Costa, L N and Pereira, M E S and De Vicente, J and Desai, S and Diehl, H T and Dietrich, J P and Everett, S and Ferrero, I and Frieman, J and García-Bellido, J and Gerdes, D W and Gutierrez, G and Hinton, S R and Honscheid, K and James, D J and Kuehn, K and Kuropatkin, N and Lima, M and Marshall, J L and Mena-Fernández, J and Menanteau, F and Miquel, R and Mohr, J J and Ogando, R L C and Pieres, A and Raveri, M and Rodriguez-Monroy, M and Sanchez, E and Scarpine, V and Sevilla-Noarbe, I and Smith, M and Suchyta, E and Swanson, M E C and Tarle, G and To, C and Weaverdyck, N and Weller, J and Wiseman, P (2023) The XMM Cluster Survey : Exploring scaling relations and completeness of the Dark Energy Survey Year 3 redMaPPer cluster catalogue. Monthly Notices of the Royal Astronomical Society, 522 (4). pp. 5267-5290. ISSN 0035-8711

Abstract

We cross-match and compare characteristics of galaxy clusters identified in observations from two sky surveys using two completely different techniques. One sample is optically selected from the analysis of 3 years of Dark Energy Survey observations using the redMaPPer cluster detection algorithm. The second is X-ray selected from XMM observations analysed by the XMM Cluster Survey. The samples comprise a total area of 57.4 deg2, bounded by the area of four contiguous XMM survey regions that overlap the DES footprint. We find that the X-ray-selected sample is fully matched with entries in the redMaPPer catalogue, above λ > 20 and within 0.1 <$z$ <0.9. Conversely, only 38 per cent of the redMaPPer catalogue is matched to an X-ray extended source. Next, using 120 optically clusters and 184 X-ray-selected clusters, we investigate the form of the X-ray luminosity–temperature (LX –TX ), luminosity–richness (LX –λ), and temperature–richness (TX –λ) scaling relations. We find that the fitted forms of the LX –TX relations are consistent between the two selection methods and also with other studies in the literature. However, we find tentative evidence for a steepening of the slope of the relation for low richness systems in the X-ray-selected sample. When considering the scaling of richness with X-ray properties, we again find consistency in the relations (i.e. LX –λ and TX –λ) between the optical and X-ray-selected samples. This is contrary to previous similar works that find a significant increase in the scatter of the luminosity scaling relation for X-ray-selected samples compared to optically selected samples.