Void replenishment: how voids accrete matter over cosmic history
arXiv:2109.08165 · doi:10.3847/2041-8213/ac2816
Abstract
Cosmic voids are underdense regions filling up most of the volume in the Universe. They are expected to emerge in regions comprising negative initial density fluctuations, and subsequently expand as the matter around them collapses and forms walls, filaments and clusters. We report results from the analysis of a cosmological simulation specially designed to accurately describe low-density regions, such as cosmic voids. Contrary to the common expectation, we find that voids also experience significant mass inflows over cosmic history. On average, of the mass of voids in the sample at is accreted from overdense regions, reaching values beyond for a significant fraction of voids. More than half of the mass entering the voids lingers on periods of time well inside them, reaching inner radii. This would imply that part of the gas lying inside voids at a given time proceeds from overdense regions (e.g., clusters or filaments), where it could have been pre-processed, thus challenging the scenario of galaxy formation in voids, and dissenting from the idea of being pristine environments.
arXiv commentAccepted for publication in The Astrophysical Journal Letters (ApJL). 11 pages (main text: 6 pages), 3 figures and 3 supplementary figures included in the PDF; the movie on Supplementary Figure 3 can be accessed on https://www.uv.es/davape3/voids/figS3_animation.mp4
References in corpus (32)
- A hierarchy of voids: Much ado about nothing
- Evolution of the cosmic web
- ZOBOV: a parameter-free void-finding algorithm
- The Evolution of Dark Matter Halo Properties in Clusters, Filaments, Sheets and Voids
- A Cosmic Watershed: the WVF Void Detection Technique
- Precision cosmography with stacked voids
- The Aspen--Amsterdam Void Finder Comparison Project
- The darkness that shaped the void: dark energy and cosmic voids
- Precision cosmology with voids: definition, methods, dynamics
- Spatial and Dynamical Properties of Voids in a LCDM Universe
- The Hierarchical Structure and Dynamics of Voids
- On determining the shape of matter distributions
- Cosmic Voids: structure, dynamics and galaxies
- Clues on void evolution II: Measuring density and velocity profiles on SDSS galaxy redshift space distortions
- Only the Lonely: H I Imaging of Void Galaxies
- Voids in the 2dFGRS and LCDM simulations: spatial and dynamical properties
- Void Ellipticity Distribution as a Probe of Cosmology
- The star formation activity in cosmic voids
- On the universality of void density profiles
- Omega from Velocities in Voids
- Encounters of Merger and Accretion Shocks in Galaxy Clusters and their Effects on Intracluster Medium
- A new multidimensional AMR Hydro+Gravity Cosmological code
- The structure of cosmic voids in a LCDM Universe
- The life and death of cosmic voids
- The Size, Shape and Orientation of Cosmological Voids in the Sloan Digital Sky Survey
- Voids and the Cosmic Web: cosmic depressions & spatial complexity
- On the accretion history of galaxy clusters: temporal and spatial distribution
- Unbound Particles in Dark Matter Halos
- Is ram-pressure stripping an efficient mechanism to remove gas in galaxies?
- Quantifying the coherent outflows of galaxies around voids in the SDSS DR7
- The central region of a void: an analytical solution
- Dynamical Evolution of Voids with Surrounding Gravitational Tidal Field