Oral Presentation
Identifying Cosmic Voids as Cluster Counterpart
Presenter: Junsup Shim (ASIAA)
We develop a method to identify cosmic voids from matter/galaxy density fields by adopting a physically-motivated void-cluster correspondence theory that voids are the counterpart of massive clusters. To prove the concept we use a pair of LCDM 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. We study the voids corresponding to the halos more massive than 10^{13}Msol/h and find a power-law scaling relation between the void size and the corresponding cluster mass. We also find 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/galaxy density field without their mirror information. The completeness and reliability we achieve in recovering voids corresponding to clusters more massive than 3x10^{14}Msol/h are about 70-74 % for matter density fields and 60-67% for galaxy density fields. Our results demonstrate that we can apply this method to the galaxy redshift survey data to identify cosmic voids corresponding statistically to the galaxy clusters in a given mass range.
asiaa.sinica.edu.tw