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Mock weak lensing analysis of simulated galaxy clusters: bias and scatter in mass and concentration

Bahe, YM and McCarthy, IG and King, LJ (2012) Mock weak lensing analysis of simulated galaxy clusters: bias and scatter in mass and concentration. Monthly Notices of the Royal Astronomical Society, 421 (2). pp. 1073-1088. ISSN 0035-8711

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Abstract

We quantify the bias and scatter in galaxy cluster masses M200 and concentrations c derived from an idealised mock weak gravitational lensing (WL) survey, and their effect on the cluster mass-concentration relation. For this, we simulate WL distortions on a population of background galaxies due to a large (≈ 3000) sample of galaxy cluster haloes extracted from the Millennium Simulation at z ≃ 0.2. This study takes into account the influence of shape noise, cluster substructure and asphericity as well as correlated large-scale structure, but not uncorrelated large-scale structure along the line of sight and observational effects (e.g., the source redshift distribution and measurement, and measurement of galaxy ellipticities). We find a small, but non-negligble, negative median bias in both mass and concentration at a level of ∼ 5%, the exact value depending both on cluster mass and radial survey range. Both the mass and concentration derived from WL show considerable scatter about their true values. This scatter has, even for the highest mass clusters of M200 > 1014.8M⊙, a level of ∼ 30% and ∼ 20% for concentration and mass respectively and increases strongly with decreasing cluster mass. For a typical survey analysing 30 galaxies per arcmin2 over a radial range from 30′′ to 15′ from the cluster centre, the derived M200-c relation has a slope and normalisation too low compared to the underlying true (3D) relation by ∼ 40% and ∼ 15% respectively. The scatter and bias in mass are shown to reflect a departure at large radii of the true WL shear/matter distribution of the simulated clusters from the NFW profile adopted in modelling the mock observations. Orientation of the triaxial cluster haloes dominates the concentration scatter (except at low masses, where galaxy shape noise becomes dominant), while the bias in c is mostly due to substructure within the virial radius.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Mon. Not. R. Astron. Soc. 421, 1073–1088 (2012), "Mock weak lensing analysis of simulated galaxy clusters: bias and scatter in mass and concentration" is available online at: http://dx.doi.org/10.1111/j.1365-2966.2011.20364.x
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 28 May 2015 14:03
Last Modified: 09 Sep 2017 02:40
DOI or Identification number: 10.1111/j.1365-2966.2011.20364.x
URI: http://researchonline.ljmu.ac.uk/id/eprint/1317

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