The Influence of Concentration and Dynamical State on Scatter in the Galaxy Cluster Mass-Temperature Relation

Yang, Hsiang-Yi Karen; Ricker, Paul M.; Sutter, P. M.

doi:10.1088/0004-637x/699/1/315

The Influence of Concentration and Dynamical State on Scatter in the Galaxy Cluster Mass-Temperature Relation

Journal Article · Thu Jun 11 00:00:00 EDT 2009 · The Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637x/699/1/315· OSTI ID:1564657

Yang, Hsiang-Yi Karen ^[1]; Ricker, Paul M. ^[2]; Sutter, P. M. ^[1]

Univ. of Illinois, Urbana, IL (United States)
Univ. of Illinois, Urbana, IL (United States); National Center for Supercomputing Applications, Urbana, IL (United States)

Using a hydrodynamics plus N-body simulation of galaxy cluster formation within a large volume and mock Chandra X-ray observations, we study the form and evolution of the intrinsic scatter about the best-fit X-ray temperature-mass relation for clusters. We investigate the physical origin of the scatter by correlating it with quantities that are closely related to clusters' formation and merging histories. We also examine the distribution of the scatter for merging and non-merging populations, identified using halo merger trees derived from the simulation as well as X-ray substructure measures. We find a strong correlation between the scatter in the M-T_X relation and the halo concentration, in the sense that more concentrated clusters tend to be cooler than clusters with similar masses. No bias is found between the merging and relaxed clusters, but merging clusters generally have greater scatter, which is related to the properties of the distribution of halo concentrations. We also detect a signature of non-lognormality in the distribution of scatter for our simulated clusters both at z = 0 and at z = 1. A detailed comparison of merging clusters identified by substructure measures and by halo merger trees is given in the discussion. Finally we conclude that, when cooling-related effects are neglected, the variation in halo concentrations is a more important factor for driving the intrinsic scatter in the M-T_X relation, while departures from hydrostatic equilibrium due to cluster mergers have a minor effect.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Krell Institute, Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-97ER25308

OSTI ID:: 1564657

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 1 Vol. 699; ISSN 0004-637X

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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