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Title: Shape profiles and orientation bias for weak and strong lensing cluster halos

We study the intrinsic shape and alignment of isodensities of galaxy cluster halos extracted from the MultiDark MDR1 cosmological simulation. We find that the simulated halos are extremely prolate on small scales and increasingly spherical on larger ones. Due to this trend, analytical projection along the line of sight produces an overestimation of the concentration index as a decreasing function of radius, which we quantify by using both the intrinsic distribution of three-dimensional concentrations (c {sub 200}) and isodensity shape on weak and strong lensing scales. We find this difference to be ∼18% (∼9%) for low- (medium-)mass cluster halos with intrinsically low concentrations (c {sub 200} = 1-3), while we find virtually no difference for halos with intrinsically high concentrations. Isodensities are found to be fairly well aligned throughout the entirety of the radial scale of each halo population. However, major axes of individual halos have been found to deviate by as much as ∼30°. We also present a value-added catalog of our analysis results, which we have made publicly available to download.
Authors:
;  [1]
  1. Physics Department, Drexel University, Philadelphia, PA 19104 (United States)
Publication Date:
OSTI Identifier:
22370233
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 795; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CATALOGS; CONCENTRATION RATIO; COSMOLOGICAL MODELS; DISTRIBUTION; ELEMENT ABUNDANCE; GALAXY CLUSTERS; GRAVITATIONAL LENSES; MASS; NONLUMINOUS MATTER; SIMULATION; SPHERICAL CONFIGURATION; THREE-DIMENSIONAL CALCULATIONS