Cool Cores in Clusters of Galaxies in the Dark Energy Survey

Graham, K.; O'Donnell, J.; Silverstein, M. M.; Eiger, O.; Jeltema, T. E.; Hollowood, D. L.; Cross, D.; Everett, S.; Giles, P.; Jobel, J.; Laubner, D.; Mcdaniel, A.; Romer, A. K.; Swart, A.; Aguena, M.; Allam, S.; Alves, O.; Brooks, D.; Carrasco Kind, M.; Carretero, J.; Costanzi, M.; da Costa, L. N.; Pereira, M. E. S.; De Vicente, J.; Desai, S.; Dietrich, J. P.; Doel, P.; Ferrero, I.; Frieman, J.; García-Bellido, J.; Gruen, D.; Gruendl, R. A.; Hinton, S. R.; Honscheid, K.; James, D. J.; Kuehn, K.; Kuropatkin, N.; Lahav, O.; Marshall, J. L.; Melchior, P.; Mena-Fernández, J.; Menanteau, F.; Miquel, R.; Ogando, R. L. C.; Palmese, A.; Pieres, A.; Malagón, A. A. Plazas; Reil, K.; Rodriguez-Monroy, M.; Sanchez, E.; Scarpine, V.; Schubnell, M.; Smith, M.; Suchyta, E.; Tarle, G.; To, C.; Weaverdyck, N.; Collaboration, Des

doi:10.3847/2515-5172/acd1e9

We search for the presence of cool cores in optically selected galaxy clusters from the Dark Energy Survey (DES) and investigate their prevalence as a function of redshift and cluster richness. Clusters were selected from the redMaPPer analysis of three years of DES observations that have archival Chandra X-ray observations, giving a sample of 99 clusters with a redshift range of 0.11 < z < 0.87 and a richness range of 25 < λ < 207. Using the X-ray data, the core temperature was compared to the outer temperature to identify clusters where the core temperature is a factor of 0.7 or less than the outer temperature. We found a cool core fraction of approximately 20% with no significant trend in the cool core fraction with either redshift or richness....