Locations of Accretion Shocks around Galaxy Clusters and the ICM properties: insights from Self-Similar Spherical Collapse with arbitrary mass accretion rates

Abstract

Accretion shocks around galaxy clusters mark the position where the infalling diffuse gas is significantly slowed down, heated up, and becomes a part of the intracluster medium (ICM). They play an important role in setting the ICM properties. Hydrodynamical simulations have found an intriguing result that the radial position of this accretion shock tracks closely the position of the `splashback radius' of the dark matter, despite the very different physical processes that gas and dark matter experience. Using the self-similar spherical collapse model for dark matter and gas, we find that an alignment between the two radii happens only for a gas with an adiabatic index of $\gamma \approx 5/3$ and for clusters with moderate mass accretion rates. In addition, we find that some observed ICM properties, such as the entropy slope and the effective polytropic index lying around $\sim 1.1-1.2$, are captured by the self-similar spherical collapse model, and are insensitive to the mass accretion history.

12 pages, 10 figures, 3 tables, published in MNRAS

References in corpus (6)

• Rotation-Dependent Catastrophic Disruption of Gravitational Aggregates
• The splashback radius as a physical halo boundary and the growth of halo mass
• Splashback in accreting dark matter halos
• Cosmological Shock Waves in the Large Scale Structure of the Universe: Non-gravitational Effects
• Mass Accretion and its Effects on the Self-Similarity of Gas Profiles in the Outskirts of Galaxy Clusters
• The outer profile of dark matter halos: an analytical approach

Cited by in corpus (28)

• The Physics of Galaxy Cluster Outskirts
• Measurement of the Splashback Feature around SZ-selected Galaxy Clusters with DES, SPT and ACT
• The Cosmic Thermal History Probed by Sunyaev-Zeldovich Effect Tomography
• Encounters of Merger and Accretion Shocks in Galaxy Clusters and their Effects on Intracluster Medium
• The splashback boundary of haloes in hydrodynamic simulations
• On the evolution of the entropy and pressure profiles in X-ray luminous galaxy clusters at z > 0.4
• Imprints of Mass Accretion History on the Shape of the Intracluster Medium and the $T_X-M$ Relation
• Shocks in the Stacked Sunyaev-Zel'dovich Profiles of Clusters I: Analysis with the Three Hundred Simulations
• Shock and Splash: Gas and Dark Matter Halo Boundaries around LambdaCDM Galaxy Clusters
• Shocks in the Stacked Sunyaev-Zel'dovich Profiles of Clusters II: Measurements from SPT-SZ + Planck Compton-y Map
• First detection of a virial shock with SZ data: implication for the mass accretion rate of Abell 2319
• On the accretion history of galaxy clusters: temporal and spatial distribution
• Stirred, not Clumped: Evolution of Temperature Profiles in the Outskirts of Galaxy Clusters
• Evolution of Splashback Boundaries and Gaseous Outskirts: Insights from Mergers of Self-similar Galaxy Clusters
• The polytropic state of the intracluster medium in the X-COP cluster sample
• Collision of Merger and Accretion Shocks: Formation of Mpc-scale Contact Discontinuity in the Perseus Cluster
• Entrainment of Hot Gas into Cold Streams: The Origin of Excessive Star-formation Rates at Cosmic Noon
• A New Interpretation of the Mass-Temperature Relation and Mass Calibration of Galaxy Clusters Based on the Fundamental Plane
• The thermal and gravitational energy densities in the large-scale structure of the Universe
• Can the splashback radius be an observable boundary of galaxy clusters?
• Characterizing galaxy clusters by their gravitational potential: systematics of cluster potential reconstruction
• Cosmic accretion shocks as a tool to measure the dark matter mass of galaxy clusters
• Halo Concentrations and the Fundamental Plane of Galaxy Clusters
• The impact of halo concentration on the Sunyaev Zel'dovich effect signal from massive galaxy clusters
• Iterative mean-field approach to the spherical collapse of dark matter halos
• The SRG/eROSITA All-Sky Survey. Detection of shock-heated gas beyond the halo boundary into the accretion region
• Go with the Flow: The Self-Similar and Non-Linear Behaviour of Large-Scale In- and Outflows and the Impact of Accretion Shocks from Galaxies to Galaxy Clusters
• The eventful life journey of galaxy clusters. II. Impact of mass accretion on the thermodynamical structure of the ICM