Turbulence in the SuperModel: Mass Reconstruction with Nonthermal Pressure for Abell 1835

Abstract

The total mass derived from X-ray emission is biased low in a large number of clusters when compared with the mass estimated via strong and weak lensing. Suzaku and Chandra observations out to the virial radius report in several relaxed clusters steep temperature gradients that on assuming pure thermal hydrostatic equilibrium imply an unphysically decreasing mass profile. Moreover, the gas mass fraction appears to be inconsistent with the cosmic value measured from the CMB. Such findings can be interpreted as an evidence for an additional nonthermal pressure in the outskirts of these clusters. This nonthermal component may be due to turbulence stirred by residual bulk motions of extragalactic gas infalling into the cluster. Here we present a SuperModel analysis of Abell 1835 observed by Chandra out to the virial radius. The SuperModel formalism can include in the equilibrium a nonthermal component whose level and distribution are derived imposing that the gas mass fraction f_{gas} equals the cosmic value at the virial radius. Including such a nonthermal component, we reconstruct from X rays an increasing mass profile consistent with the hydrostatic equilibrium also in the cluster outskirts and in agreement at the virial boundary with the weak lensing value. The increasing f_{gas} profile confirms that the baryons are not missing but located at the cluster outskirts.

8 pages, 5 figures. Accepted by ApJ

References in corpus (15)

• Planck 2013 results. XVI. Cosmological parameters
• Testing X-ray Measurements of Galaxy Clusters with Cosmological Simulations
• Stellar and total baryon mass fractions in groups and clusters since redshift 1
• Baryons at the Edge of the X-ray Brightest Galaxy Cluster
• Calibration of the galaxy cluster M_500-Y_X relation with XMM-Newton
• Evidence for Non-Hydrostatic Gas from the Cluster X-ray to Lensing Mass Ratio
• LoCuSS: A Comparison of Cluster Mass Measurements from XMM-Newton and Subaru - Testing Deviation from Hydrostatic Equilibrium and Non-Thermal Pressure Support
• The Cluster Mass Function from Weak Gravitational Lensing
• Hydrodynamical adaptive mesh refinement simulations of turbulent flows - II. Cosmological simulations of galaxy clusters
• The X-ray/SZ view of the virial region. I. Thermodynamic properties
• X-ray exploration of the outskirts of the nearby Centaurus cluster using Suzaku and Chandra
• Scaling relations and mass calibration of the X-ray luminous galaxy clusters at z~0.2: XMM-Newton observations
• Missing Thermal Energy of the Intracluster Medium
• The X-ray/SZ view of the virial region. II. Gas mass fraction
• Suzaku observations of Abell 1835 outskirts: Deviation from hydrostatic equilibrium

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