Journal
ASTRONOMY & ASTROPHYSICS
Volume 576, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201425140
Keywords
techniques: high angular resolution; galaxies: clusters: individual: CL J1226.9+3332
Categories
Funding
- Foundation Nanoscience Grenoble
- ANR
- LabEx FOCUS [ANR-11-LABX-0013]
- European Research Council Advanced Grant ORISTARS under the European Union's Seventh Framework Program [291294]
- ENIGMASS French LabEx
- CNES post-doctoral fellowship program
- FOCUS French LabEx
- CNES doctoral fellowship program
- [ANR-11-BS56-015]
- STFC [ST/M001334/1, ST/K000926/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K000926/1, ST/M001334/1] Funding Source: researchfish
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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 M-500 = 5.96(-0.79)(+1.02) x 10(14) M-circle dot within the radius R-500 = 930(-43)(+50) kpc, at a 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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