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

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