The mass-size relation of galaxy clusters

Abstract

The outskirts of accreting dark matter haloes exhibit a sudden drop in density delimiting their multi-stream region. Due to the dynamics of accretion, the location of this physically motivated edge strongly correlates with the halo growth rate. Using hydrodynamical zoom-in simulations of high-mass clusters, we explore this definition in realistic simulations and find an explicit connection between this feature in the dark matter and galaxy profiles. We also show that the depth of the splashback feature correlates well with the direction of filaments and, surprisingly, the orientation of the brightest cluster galaxy. Our findings suggest that galaxy profiles and weak-lensing masses can define an observationally viable mass-size scaling relation for galaxy clusters, which can be used to extract cosmological information.

9 pages, 9 figures. Fig. 6 and 9 updated with correct labels

References in corpus (19)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• The hierarchical formation of the brightest cluster galaxies
• Rotation-Dependent Catastrophic Disruption of Gravitational Aggregates
• The Hierarchical Build-Up of Massive Galaxies and the Intracluster Light since z=1
• Splashback in accreting dark matter halos
• The pseudo-evolution of halo mass
• Lensing Constraints on the Mass Profile Shape and the Splashback Radius of Galaxy Clusters
• Universal at last? The splashback mass function of dark matter halos
• A homogeneous measurement of the delay between the onsets of gas stripping and star formation quenching in satellite galaxies of groups and clusters
• The splashback boundary of haloes in hydrodynamic simulations
• A natural boundary of dark matter haloes revealed around the minimum bias and maximum infall locations
• Probing galaxy evolution in massive clusters using ACT and DES: splashback as a cosmic clock
• Stellar splashback: the edge of the intracluster light
• The splashback radius in symmetron gravity
• The splashback radius of halos from particle dynamics: III. Halo catalogs, merger trees, and host-subhalo relations
• Evolution and Role of Mergers in the BCG-Cluster Alignment. A View from Cosmological Hydro-Simulations
• Clusters Have Edges: The Projected Phase SpaceStructure of SDSS redMaPPer Clusters
• Ellipticity of Brightest Cluster Galaxies as tracer of halo orientation and weak-lensing mass bias
• Measuring Cosmological Distances Using Cluster Edges as a Standard Ruler

Cited by in corpus (7)

• SIBELIUS-DARK: a galaxy catalogue of the Local Volume from a constrained realisation simulation
• The impact of galaxy selection on the splashback boundaries of galaxy clusters
• A physical and concise halo model based on the depletion radius
• Dynamical cluster masses from photometric surveys
• Anisotropy and characteristic scales in halo density gradient profiles
• Shape and connectivity of groups and clusters: Impact of dynamical state and accretion history
• Splashback radius and the mass accretion rate of RASS MCMF galaxy clusters