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

R. Adam, B. Comis, J. F. MacÍas-Pérez, A. Adane, P. Ade, P. André, A. Beelen, B. Belier, A. Benoît, A. Bideaud, N. Billot, G. Blanquer, O. Bourrion, M. Calvo, A. Catalano, G. Coiffard, A. Cruciani, A. D'Addabbo, F. X. Désert, S. DoyleJ. Goupy, C. Kramer, S. Leclercq, J. Martino, Philip Mauskopf, F. Mayet, A. Monfardini, F. Pajot, E. Pascale, L. Perotto, E. Pointecouteau, N. Ponthieu, V. Revéret, A. Ritacco, L. Rodriguez, G. Savini, K. Schuster, A. Sievers, C. Tucker, R. Zylka

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43 Scopus citations


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.

Original languageEnglish (US)
Article numberA12
JournalAstronomy and Astrophysics
StatePublished - Apr 1 2015


  • CL J1226.9+3332
  • High angular resolution - galaxies
  • Techniques
  • clusters
  • individual

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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  • NIKA maps of ClG J1226.9+3332 at 150 and 250GHz

    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


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