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

R. Adam (1) , B. Comis (1) , J.F. Macías-Pérez (1) , A. Adane , P. Ade , P. André , A. Beelen (2) , B. Belier (3) , A. Benoît (4) , A. Bideaud , N. Billot , G. Blanquer (1) , O. Bourrion (1) , M. Calvo (5) , A. Catalano (1) , G. Coiffard , A. d'Addabbo (4) , F. -X. Désert , S. Doyle , J. Goupy (4) , C. Kramer , S. Leclercq , J. Martino (2) , P. Mauskopf , F. Mayet (1) , A. Monfardini (4) , F. Pajot (2) , E. Pascale , L. Perotto (1) , E. Pointecouteau , N. Ponthieu , V. Revéret , A. Ritacco (1) , L. Rodriguez , G. Savini , K. Schuster , A. Sievers , C. Tucker , R. Zylka

1 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
2 IAS - Institut d'astrophysique spatiale
3 IEF - Institut d'électronique fondamentale
4 NEEL - HELFA - Hélium : du fondamental aux applications
5 NEEL - Cryo - Cryogénie

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. tSZ observations have proven to be a powerful tool to detect and study them but high angular resolution observations are now necessary to push their investigation at higher redshift. In this paper, we report high angular (< 20 arcsec) resolution tSZ observations of the high-redshift cluster CLJ1226.9+3332 (z=0.89). It was imaged at 150 and 260 GHz using the NIKA camera at the IRAM 30-meter telescope. The 150 GHz map shows that CLJ1226.9+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 radial pressure, density, temperature and entropy distributions. The total mass profile of the cluster is derived, and we find $M_{500} = 5.96^{+1.02}_{-0.79} $ x $10^{14} M_{\odot}$ within the radius $R_{500} = 930^{+50}_{-43}$ kpc, at 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.

Domaines: Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]; Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]

R. Adam, B. Comis, J.F. Macías-Pérez, A. Adane, P. Ade, et al.. Pressure distribution of the high-redshift cluster of galaxies CL J1226.9+3332 with NIKA. Astronomy and Astrophysics - A&A, 2015, 576, pp.A12. ⟨10.1051/0004-6361/201425140⟩. ⟨in2p3-01074110⟩