Mass variance from archival X-ray properties of Dark Energy Survey Year-1 
galaxy clusters

Farahi, A.; Chen, X.; Evrard, A. E.; Hollowood, D. L.; Wilkinson, R.; Bhargava, S.; Giles, P.; Romer, A. K.; Jeltema, T.; Hilton, M.; Bermeo, A.; Mayers, J.; Cervantes, C. Vergara; Rozo, E.; Rykoff, E. S.; Collins, C.; Costanzi, M.; Everett, S.; Liddle, A. R.; Mann, R. G.; Mantz, A.; Rooney, P.; Sahlen, M.; Stott, J.; Viana, P. T. P.; Zhang, Y.; Annis, J.; Avila, S.; Brooks, D.; Buckley-Geer, E.; Burke, D. L.; Rosell, A. Carnero; Kind, M. Carrasco; Carretero, J.; Castander, F. J.; da Costa, L. N.; Vicente, J. De; Desai, S.; Diehl, H. T.; Dietrich, J. P.; Doel, P.; Flaugher, B.; Fosalba, P.; Frieman, J.; García-Bellido, J.; Gaztanaga, E.; Gerdes, D. W.; Gruen, D.; Gruendl, R. A.; Gschwend, J.; Gutierrez, G.; Honscheid, K.; James, D. J.; Krause, E.; Kuehn, K.; Kuropatkin, N.; Lima, M.; Maia, M. A. G.; Marshall, J. L.; Melchior, P.; Menanteau, F.; Miquel, R.; Ogando, R. L. C.; Plazas, A. A.; Sanchez, E.; Scarpine, V.; Schubnell, M.; Serrano, S.; Sevilla-Noarbe, I.; Smith, M.; Sobreira, F.; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; Thomas, D.; Tucker, D. L.; Vikram, V.; Walker, A. R.; Weller, J.

doi:10.1093/mnras/stz2689

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Mass variance from archival X-ray properties of Dark Energy Survey Year-1 galaxy clusters

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Weller, J.
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Farahi, A., Chen, X., Evrard, A. E., Hollowood, D. L., Wilkinson, R., Bhargava, S., et al. (2019). Mass variance from archival X-ray properties of Dark Energy Survey Year-1 galaxy clusters. Monthly Notices of the Royal Astronomical Society, 490(3), 3341-3354. doi:10.1093/mnras/stz2689.

Cite as: https://hdl.handle.net/21.11116/0000-0005-955B-D

Abstract

Using archival X-ray observations and a lognormal population model, we estimate constraints on the intrinsic scatter in halo mass at fixed optical richness for a galaxy cluster sample identified in Dark Energy Survey Year-One (DES-Y1) data with the redMaPPer algorithm. We examine the scaling behaviour of X-ray temperatures, T_X, with optical richness, λ_RM, for clusters in the redshift range 0.2 < z < 0.7. X-ray temperatures are obtained from Chandra and XMM observations for 58 and 110 redMaPPer systems, respectively. Despite non-uniform sky coverage, the T_X measurements are >50 per cent complete for clusters with λ_RM on the two samples produces consistent posterior scaling parameters, from which we derive a combined constraint on the residual scatter, σ_lnT|λ=0.275±0.019⁠. Joined with constraints for T_X halo mass from the Weighing the Giants program and richness–temperature covariance estimates from the LoCuSS sample, we derive the richness-conditioned scatter in mass, σ_lnM|λ=0.30±0.04_(stat)±0.09_(sys) at an optical richness of approximately 100. Uncertainties in external parameters, particularly the slope and variance of the T_X–mass relation and ⁠, scaling with > 130. Regression analysis the covariance of T_X and λ_RM at fixed mass, dominate the systematic error. The 95 per cent confidence region from joint sample analysis is relatively broad, σ_lnM|λ∈[0.14,0.55]⁠, or a factor 10 in variance.