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The thermal Sunyaev-Zel'dovich (tSZ) effect is expected to provide a lowscatter mass proxy for galaxy clusters since it is directly proportional to thecluster thermal energy. The tSZ observations have proven to be a powerful toolfor detecting and studying them, but high angular resolution observations arenow needed to push their investigation to a higher redshift. In this paper, wereport high angular (< 20 arcsec) resolution tSZ observations of thehigh-redshift cluster CL J1226.9+3332 (z=0.89). It was imaged at 150 and 260GHz using the NIKA camera at the IRAM 30-meter telescope. The 150 GHz map showsthat CL J1226.9+3332 is morphologically relaxed on large scales with evidenceof a disturbed core, while the 260 GHz channel is used mostly to identify pointsource contamination. NIKA data are combined with those of Planck and X-rayfrom Chandra to infer the cluster's radial pressure, density, temperature, andentropy distributions. The total mass profile of the cluster is derived, and wefind $M_{500} = 5.96^{+1.02}_{-0.79} $ x $10^{14} M_{\odot}$ within the radius$R_{500} = 930^{+50}_{-43}$ kpc, at a 68% confidence level. ($R_{500}$ is theradius within which the average density is 500 times the critical density atthe cluster's redshift.) NIKA is the prototype camera of NIKA2, a KIDs (kineticinductance detectors) based instrument to be installed at the end of 2015. Thiswork is, therefore, part of a pilot study aiming at optimizing tSZ NIKA2 largeprograms.

Pressure distribution of the high-redshift cluster of galaxies CL J1226.9+3332 with NIKA