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

Adam, R., Comis, B., Macías-Pérez, J.-F., Adane, A., Ade, Peter ORCID:, André, P., Beelen, A., Belier, B., Benoît, A., Bideaud, Aurelien, Billot, N., Blanquer, G., Bourrion, O., Calvo, M., Catalano, A., Coiffard, G., Cruciani, A., D'Addabbo, A., Désert, F.-X., Doyle, Simon ORCID:, Goupy, J., Kramer, C., Leclercq, S., Martino, J., Mauskopf, Philip ORCID:, Mayet, F., Monfardini, A., Pajot, F., Pascale, Enzo ORCID:, Perotto, L., Pointecouteau, E., Ponthieu, N., Revéret, V., Ritacco, A., Rodriguez, L., Savini, G., Schuster, K., Sievers, A., Tucker, Carole ORCID: and Zylka, R. 2015. Pressure distribution of the high-redshift cluster of galaxies CL J1226.9+3332 with NIKA. Astronomy and Astrophysics 576 , A12. 10.1051/0004-6361/201425140

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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 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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Publisher: EDP Sciences
ISSN: 0004-6361
Date of First Compliant Deposit: 1 December 2017
Date of Acceptance: 28 November 2014
Last Modified: 16 May 2023 18:36

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