Void Galaxy Distribution: A Challenge for $\Lambda$CDM

Autor:	Tavasoli, Saeed
Rok vydání:	2021
Předmět:	Astrophysics - Cosmology and Nongalactic Astrophysics Astrophysics - Astrophysics of Galaxies
Druh dokumentu:	Working Paper
DOI:	10.3847/2041-8213/ac1357
Popis:	We extract void catalogs from the Sloan Digital Sky Survey Data Release 16 (SDSS DR16) survey and also from the Millennium simulation. We focus our comparison on distribution of galaxies brighter than $M_r < -18$ inside voids and study the mean separation of void galaxies, distance from the void center, and the radial density profile. We find that mean separation of void galaxies depends on void size, as bigger voids have lower mean separation in both samples. However, void galaxies in the observation sample seem to have generally larger mean-distance than simulated ones at any given void size. In addition, observed void galaxies tend to reside closer to the void center than those in the simulation. This discrepancy is also shown in the density profile of voids. Regardless of the void size, the central densities of real void profiles are higher than the ones in the predicted simulated catalog. Comment: Accepted in ApJ Letter
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2109.10369 Zobrazit plný text záznamu View this record from Arxiv