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

Abstract : The thermal Sunyaev-Zel'Dovich (tSZ) effect is expected to provide a low scatter mass proxy for galaxy clusters since it is directly proportional to the cluster thermal energy. tSZ observations have proven to be a powerful tool to detect and study them but high angular resolution observations are now necessary to push their investigation at higher redshift. In this paper, we report high angular (< 20 arcsec) resolution tSZ observations of the high-redshift cluster CLJ1226.9+3332 (z=0.89). It was imaged at 150 and 260 GHz using the NIKA camera at the IRAM 30-meter telescope. The 150 GHz map shows that CLJ1226.9+3332 is morphologically relaxed on large scales with evidence of a disturbed core, while the 260 GHz channel is used mostly to identify point source contamination. NIKA data are combined with those of Planck and X-ray from Chandra to infer the cluster radial pressure, density, temperature and entropy distributions. The total mass profile of the cluster is derived, and we find $M_{500} = 5.96^{+1.02}_{-0.79} $ x $10^{14} M_{\odot}$ within the radius $R_{500} = 930^{+50}_{-43}$ kpc, at 68% confidence level ($R_{500}$ is the radius within which the average density is 500 times the critical density at the cluster's redshift). NIKA is the prototype camera of NIKA2, a KIDs (Kinetic Inductance Detectors) based instrument to be installed at the end of 2015. This work is, therefore, part of a pilot study aiming at optimizing tSZ NIKA2 large programs.
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Soumis le : lundi 13 octobre 2014 - 08:20:59
Dernière modification le : mardi 15 mai 2018 - 20:10:11

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R. Adam, B. Comis, J.F. Macías-Pérez, A. Adane, P. Ade, et al.. Pressure distribution of the high-redshift cluster of galaxies CL J1226.9+3332 with NIKA. Astronomy and Astrophysics - A&A, EDP Sciences, 2015, 576, pp.A12. 〈10.1051/0004-6361/201425140〉. 〈in2p3-01074110〉



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