X-ray, lensing and Sunyaev Zel'dovich triaxial analysis of Abell 1835
  out to R_{200}
  Measuring the intrinsic shape and orientation of dark matter (DM) and
intracluster (IC) gas in galaxy clusters is crucial to constraining their
formation and evolution, and for enhancing the use of clusters as more precise
cosmological probes. Extending our previous works, we present for the first
time results from a triaxial joint analysis of the galaxy cluster Abell 1835,
by means of X-ray, strong lensing (SL) and Sunyaev Zel'dovich (SZ) data. We
parametrically reconstruct the full three-dimensional structure (triaxial shape
and principal axis orientation) of both the DM and the IC gas, and the level of
non-thermal pressure of the IC gas. We find that the intermediate-major and
minor-major axis ratios of the DM are 0.71+/-0.08 and 0.59+/-0.05,
respectively, and the major axis of the DM halo is inclined with respect to the
line of sight at 18.3+/-5.2 deg. We present the first observational measurement
of the non-thermal pressure out to R_{200}, which has been evaluated to be a
few percent of the total energy budget in the internal regions, while reaching
approximately 20% in the outer volumes. We discuss the implications of our
method for the viability of the CDM scenario, focusing on the concentration
parameter C and the inner slope of the DM gamma in order to test the cold dark
matter (CDM) paradigm for structure formation: we measure gamma=1.01+/-0.06 and
C=4.32+/-0.44, values which are close to the predictions of the CDM model. The
combination of X-ray/SL data at high spatial resolution, capable of resolving
the cluster core, with the SZ data, which are more sensitive to the cluster
outer volume, allows us to characterize the level and the gradient of the gas
entropy distribution and non-thermal pressure out to R_{200}, breaking the
degeneracy among the physical models describing the thermal history of the ICM.
