Identification of Cosmic Voids as Massive Cluster Counterparts

Abstract

We develop a method to identify cosmic voids from the matter density field by adopting a physically-motivated concept that voids are the counterpart of massive clusters. To prove the concept we use a pair of $\Lambda$CDM simulations, a reference and its initial density-inverted mirror simulation, and study the relation between the effective size of voids and the mass of corresponding clusters. Galaxy cluster-scale dark matter halos are identified in the Mirror simulation at $z=0$ by linking dark matter particles. The void corresponding to each cluster is defined in the Reference simulation as the region occupied by the member particles of the cluster. We study the voids corresponding to the halos more massive than $10^{13}{h}^{-1}{M}_{\odot }$. We find a power-law scaling relation between the void size and the corresponding cluster mass. Voids with corresponding cluster mass above $10^{15}{h}^{-1}{M}_{\odot }$ occupy $\sim 1\%$ of the total simulated volume, whereas this fraction increases to $\sim 54\%$ for voids with corresponding cluster mass above $10^{13}{h}^{-1}{M}_{\odot }$. It is also found that the density profile of the identified voids follows a universal functional form. Based on these findings, we propose a method to identify cluster-counterpart voids directly from the matter density field without their mirror information by utilizing three parameters such as the smoothing scale, density threshold, and minimum core fraction. We recover voids corresponding to clusters more massive than $3\times 10^{14}{h}^{-1}{M}_{\odot }$ at 70--74 \% level of completeness and reliability. Our results suggest that we are able to identify voids in a way to associate them with clusters of a particular mass-scale.

Published in ApJ

References in corpus (10)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
• Properties of Dark Matter Haloes in Clusters, Filaments, Sheets and Voids
• ZOBOV: a parameter-free void-finding algorithm
• The Aspen--Amsterdam Void Finder Comparison Project
• The darkness that shaped the void: dark energy and cosmic voids
• Large-Scale Clustering of Cosmic Voids
• The orientation of galaxy dark matter haloes around cosmic voids
• Void Ellipticity Distribution as a Probe of Cosmology
• Alignments of Voids in the Cosmic Web
• Cosmological Information from the Small-scale Redshift Space Distortions

Cited by in corpus (8)

• Why Cosmic Voids Matter: Nonlinear Structure & Linear Dynamics
• Observational Constraints on the Dark Energy with a Quadratic Equation of State
• Unveiling the Universe with Emerging Cosmological Probes
• A possible role for the merger of clusters/voids in the cosmological expansion
• Cluster-counterpart Voids: Void Identification from Galaxy Density Field
• The Molecular and Atomic Hydrogen Gas Content of the Boötes Void galaxy CG 910
• An Anti-halo Void Catalogue of the Local Super-Volume
• Cosmological constraints from the density gradient weighted correlation function