The XMM cluster survey: exploring scaling relations and completeness of the dark energy survey year 3 redMaPPer cluster catalogue
Bacon, D.; Smith, M.; Allam, S.; Bertin, E.; Brooks, D.; Burke, D. L.; Carrasco Kind, M.; Carretero, J.; da Costa, L. N.; Desai, S.; Diehl, H. T.; Frieman, J.; García-Bellido, J.; Gerdes, D. W.; Gutierrez, G.; Honscheid, K.; James, D. J.; Kuehn, K.; Kuropatkin, N.; Lima, M.; Marshall, J. L.; Menanteau, F.; Miller, C. J.; Miquel, R.; Ogando, R. L. C.; Romer, A. K.; Sanchez, E.; Scarpine, V.; Sevilla-Noarbe, I.; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; Mann, R. G.; Mohr, J. J.; Klein, M.; Bhargava, S.; Jeltema, T.; Costanzi, M.; De Vicente, J.; Hinton, S. R.; Weller, J.; Dietrich, J. P.; Rykoff, E.; Raveri, M.; Weaverdyck, N.; Bocquet, S.; Everett, S.; Ferrero, I.; Pereira, M. E. S.; Pieres, A.; Rodriguez-Monroy, M.; To, C.; Hilton, M.; Farahi, A.; Hollowood, D.; Collins, C. A.; Stott, J. P.; Giles, P. A.; Alves, O.; Mena-Fernández, J.; Turner, D. J.; Wiseman, P.; Viana, P. T. P.; Rooney, P. J.; Sahlén, Martin; Wilkinson, R.; Upsdell, E. W.; Bermeo, A.; Manolopoulou, M.; Ebrahimpour, L.
United Kingdom, South Africa, United States, France, Germany, Portugal, Sweden, Spain, Italy, Brazil, India, Norway, Australia
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.