Mass variance from archival x-ray properties of dark energy survey year-1 galaxy clusters

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

Research output: Contribution to journalArticlepeer-review

Abstract

Using archival X-ray observations and a log-normal 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 behavior of X-ray temperatures, TX, with optical richness, λRM, 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 TXmeasurements are > 50% complete for clusters with λRM> 130. Regression analysis on the two samples produces consistent posterior scaling parameters, from which we derive a combined constraint on the residual scatter, σlnT | λ = 0.275 ± 0.019. Joined with constraints for TXscaling with halo mass from the Weighing the Giants program and richness-temperature covariance estimates from the LoCuSS sample, we derive the richnessconditioned scatter in mass, σlnM | λ = 0.30 ± 0.04(stat)± 0.09(sys), at an optical richness of approximately 70. Uncertainties in external parameters, particularly the slope and variance of the TX-mass relation and the covariance of TXand λRMat fixed mass, dominate the systematic error. The 95% confidence region from joint sample analysis is relatively broad, σlnM | λ ∈ [0.14, 0.55], or a factor ten in variance.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Mar 19 2019

Keywords

  • Clusters
  • Clusters
  • Clusters
  • Galaxies
  • Galaxies
  • Galaxies
  • General
  • Statistics
  • X-rays

ASJC Scopus subject areas

  • General

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