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. The tSZ observations have proven to be a powerful tool for detecting and studying them, but high angular resolution observations are now needed to push their investigation to a higher redshift. In this paper, we report high angular (<20 arcsec) resolution tSZ observations of the high-redshift cluster CL J1226.9+3332 (z = 0.89). It was imaged at 150 and 260 GHz using the NIKA camera at the IRAM 30-m telescope. The 150 GHz map shows that CL J1226.9+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's radial pressure, density, temperature, and entropy distributions. The total mass profile of the cluster is derived, and we find M500 = 5.96-0.79+1.02 × 1014M⊙ within the radius R500 = 930-43+50 kpc, at a 68% confidence level. (R500 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.
- CL J1226.9+3332
- High angular resolution - galaxies
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
FingerprintDive into the research topics of 'Pressure distribution of the high-redshift cluster of galaxies CL J1226.9+3332 with NIKA'. Together they form a unique fingerprint.
Adam, R. (Creator), Comis, B. (Creator), MacÍas-Pérez, J. (Contributor), Adane, A. (Creator), Ade, P. (Creator), André, P. (Contributor), Beelen, A. (Creator), Belier, B. (Creator), Benoît, A. (Contributor), Bideaud, A. (Creator), Billot, N. (Creator), Blanquer, G. (Creator), Bourrion, O. (Creator), Calvo, M. (Creator), Catalano, A. (Creator), Coiffard, G. (Creator), Cruciani, A. (Creator), D'Addabbo, A. (Creator), Désert, F. (Contributor), Doyle, S. (Creator), Goupy, J. (Creator), Kramer, C. (Creator), Leclercq, S. (Creator), Martino, J. (Creator), Mauskopf, P. (Creator), Mayet, F. (Creator), Monfardini, A. (Creator), Pajot, F. (Creator), Pascale, E. (Creator), Perotto, L. (Creator), Pointecouteau, E. (Creator), Ponthieu, N. (Creator), Revéret, V. (Contributor), Ritacco, A. (Creator), Rodriguez, L. (Creator), Savini, G. (Creator), Schuster, K. (Creator), Sievers, A. (Creator), Tucker, C. (Creator) & Zylka, R. (Creator), Strasbourg Astronomical Data Center, 2015