Volume 576, April 2015
|Number of page(s)||12|
|Section||Cosmology (including clusters of galaxies)|
|Published online||13 March 2015|
Pressure distribution of the high-redshift cluster of galaxies CL J1226.9+3332 with NIKA ⋆
1 Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Grenoble-Alpes, CNRS/IN2P3, 53 avenue des Martyrs, 38026 Grenoble, France
2 Institut de RadioAstronomie Millimétrique (IRAM), 38406 Grenoble, France
3 Astronomy Instrumentation Group, University of Cardiff, UK
4 Laboratoire AIM, CEA/IRFU, CNRS/INSU, Université Paris Diderot, CEA-Saclay, 91191 Gif-Sur-Yvette, France
5 Institut d’Astrophysique Spatiale (IAS), CNRS and Université Paris Sud, 91405 Orsay, France
6 Institut d’Electronique Fondamentale (IEF), Université Paris Sud, 91405 Orsay, France
7 Institut Néel, CNRS and Université de Grenoble, 38000 Grenoble, France
8 Institut de RadioAstronomie Millimétrique (IRAM), Granada, Spain
9 Univ. Grenoble Alpes, IPAG, 38000 Grenoble, France
10 CNRS, IPAG, 38000 Grenoble, France
11 Université de Toulouse, UPS-OMP, Institut de Recherche en Astrophysique et Planétologie (IRAP), Toulouse, France
12 CNRS, IRAP, 9 Av. colonel Roche, BP 44346, 31028 Toulouse Cedex 4, France
13 University College London, Department of Physics and Astronomy, Gower Street, London WC1E 6BT, UK
14 School of Earth and Space Exploration and Department of Physics, Arizona State University, Tempe, AZ 85287, USA
15 Dipartimento di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Roma, Italy
Received: 10 October 2014
Accepted: 28 November 2014
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+1.02-0.79 × 1014M⊙ within the radius R500 = 930+50-43 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.
Key words: techniques: high angular resolution / galaxies: clusters: individual: CL J1226.9+3332
The FITS file of the published maps is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (18.104.22.168) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/576/A12
© ESO, 2015
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