Splashback radius and the mass accretion rate of RASS MCMF galaxy clusters

Abstract

We present measurements of the radial profile of mass and galaxy number density around X-ray selected ROSAT All Sky Survey-Multi-Component Matched Filter galaxy clusters using Year 3 data from the Dark Energy Survey. We measure the projected cross-correlation signal of the RedMaGiC "high density" galaxies around an approximately volume-limited sample of 255 galaxy clusters at a median redshift of $z=0.4$ and an X-ray luminosity $L_X>10^{44}\text{ergs}{\text{s}}^{-1}{\text{h}}^{-2}$. This cross-correlation signal measured with a signal-to-noise ratio of 16.41 allows us to infer a 3D number density profile which shows a significant steepening at the edges of these galaxy clusters, namely the splashback radius of $r_{sp}$ /$h^{-1}{\mathrm{M}}_{\odot }=2.19_{-0.43}^{+0.50}$. We present the dependence of the splashback radius value over a range of absolute galaxy magnitude cuts to look for any evidence of dynamical friction affecting these results. The weak lensing signal around our galaxy clusters measured with a signal-to-noise ratio of 32.19 allows us to infer a halo mass $\text{log}(M_{200m}/h^{-1}\text{Mpc})=14.68_{-0.04}^{+0.04}$. Comparison of the location of the splashback radius with the spherical overdensity boundary $r_{200m}$ shows consistency with the $\mathrm{\Lambda CDM}$ predictions. We present the first inference of the average mass accretion rate of galaxy clusters using our measurements of the splashback radius.

21 pages, 13 figures

References in corpus (19)

• Why your model parameter confidences might be too optimistic -- unbiased estimation of the inverse covariance matrix
• The redshift dependence of the structure of massive LCDM halos
• Second ROSAT all-sky survey (2RXS) source catalogue
• Rotation-Dependent Catastrophic Disruption of Gravitational Aggregates
• Splashback in accreting dark matter halos
• The pseudo-evolution of halo mass
• Dark Energy Survey Year 3 Results: Weak Lensing Shape Catalogue
• DES Y3 results: Blending shear and redshift biases in image simulations
• Lensing Constraints on the Mass Profile Shape and the Splashback Radius of Galaxy Clusters
• The splashback boundary of haloes in hydrodynamic simulations
• Stellar splashback: the edge of the intracluster light
• The splashback radius in symmetron gravity
• LoCuSS: The splashback radius of massive galaxy clusters and its dependence on cluster merger history
• Phase-space structure of cold dark matter halos inside splashback: multi-stream flows and self-similar solution
• AMICO galaxy clusters in KiDS-DR3: measuring the splashback radius from weak gravitational lensing
• The mass-size relation of galaxy clusters
• The eROSITA Final Equatorial-Depth Survey (eFEDS) -- Splashback radius of X-ray galaxy clusters using galaxies from HSC survey
• Can we use Weak Lensing to Measure Total Mass Profiles of Galaxies on 20 kiloparsec Scales?
• Assessing Mass Loss and Stellar-to-Halo Mass Ratio of Satellite Galaxies: A Galaxy-Galaxy Lensing Approach Utilizing DECaLS DR8 Data

Cited by in corpus (3)

• The Three Hundred Project: deducing the stellar splashback structure of galaxy clusters from their orbiting profiles
• The Splashback Mass Function of Galaxy Clusters from Photometric Data
• AMICO galaxy clusters in KiDS-1000: Splashback radius from weak lensing and cluster-galaxy correlation function