Hydrostatic equilibrium of a porous intracluster medium: implications for mass fraction and X-ray luminosity

Abstract

The presence of dilute hot cavities in the intracluster medium (ICM) at the cores of clusters of galaxies changes the relation between gas temperature and its X-ray emission properties. Using the hydrostatic equations of a porous medium we solve for the ICM density for a given temperature as a function of the filling factor of dilute bubbles. We find that at a given temperature, the core X-ray luminosity increases with the filling factor. If the frequency of AGNs in clusters were higher in the past, then the filling factor could correspondingly be significant, with implications for the cluster scaling relations at high redshifts. This is especially important for the core properties, including the temperature-luminosity ($L_X-T$) relation and estimates of the core gas mass. The results imply an epoch-dependent sensitivity of the $L_X-T$ relation in the core to the porosity of the ICM. Detection of such an effect would give new insights into AGN feedback.

matches accepted version

References in corpus (31)

• The many lives of active galactic nuclei: cooling flows, black holes and the luminosities and colours of galaxies
• The broken hierarchy of galaxy formation
• Heating Hot Atmospheres with Active Galactic Nuclei
• A Systematic Study of Radio-Induced X-ray Cavities in Clusters, Groups, and Galaxies
• The statistics of LCDM Halo Concentrations
• Effects of Galaxy Formation on Thermodynamics of the Intracluster Medium
• Chandra X-ray Observations of the Hydra A Cluster: An Interaction Between the Radio Source and the X-Ray-Emitting Gas
• Chandra imaging of the complex X-ray core of the Perseus cluster
• The Lx-T Relation and Temperature Function for Nearby Clusters Revisited
• X-ray Spectroscopy of Cooling Clusters
• On the prevalence of radio-loud AGN in brightest cluster galaxies: implications for AGN heating of cooling flows
• The impact of cooling flows on the Tx-Lbol relation for the most luminous clusters
• Hydrodynamical simulations of cluster formation with central AGN heating
• Radio Bubbles in Clusters
• Cluster Heating by Viscous Dissipation of Sound Waves
• Bubbles, feedback and the intra-cluster medium: three-dimensional hydrodynamic simulations
• Physical Implications of the X-ray Properties of Galaxy Groups and Clusters
• The effect of radiative cooling on the X-ray properties of galaxy clusters
• An Observationally Motivated Framework for AGN Heating of Cluster Cores
• The Effects of Gas Dynamics, Cooling, Star Formation, and Numerical Resolution in Simulations of Cluster Formation
• Particle Energies and Filling Fractions of Radio Bubbles in Cluster Cores
• AGN self-regulation in cooling flow clusters
• Quenching Cluster Cooling Flows with Recurrent Hot Plasma Bubbles
• The Distribution of AGN in Clusters of Galaxies
• X-Ray Scaling Relations of Galaxy Groups in a Hydrodynamic Cosmological Simulation
• AGN heating and dissipative processes in galaxy clusters
• Evolution at z>0.5 of the X-ray properties of simulated galaxy clusters: comparison with the observational constraints
• XMM-Newton Observations of Evolution of Cluster X-Ray Scaling Relations at z=0.4-0.7
• The Effect of Cooling on the Density Profile of Hot Gas in Clusters of Galaxies: Is Additional Physics Needed?
• Suppressing cluster cooling flows by self-regulated heating from spatially distributed population of AGNs
• AGN heating, thermal conduction and Sunyaev-Zeldovich effect in galaxy groups and clusters

Cited by in corpus (2)

• Measuring the non-thermal pressure in early type galaxy atmospheres: A comparison of X-ray and optical potential profiles in M87 and NGC1399
• Gravo-thermodynamics of the Intracluster Medium: negative heat capacity and dilation of cooling time scales