NIKA2: a mm camera for cluster cosmology
Macias-Perez, J. F. · Adam, R. · Ade, P. · Andre, P. · Arnaud, M. · Aussel, H. · Bartalucci, I. · Beelen, A. · Benoit, A. · Bideaud, A. · Bourrion, O. · Calvo, M. · Catalano, A. · Comis, B. · De Petris, M. · Désert, F. -X. · Doyle, S. · Driessen, E. F. C. · Goupy, J. · Kramer, C. · Lagache, G. · Leclercq, S. · Lestrade, J. F. · Mauskopf, P. · Mayet, F. · Monfardini, A. · Perotto, L. · Pointecouteau, E. · Pisano, G. · Ponthieu, N. · Pratt, G. W. · Revéret, V. · Ritacco, A. · Romero, C. · Roussel, H. · Ruppin, F. · Schuster, K. · Sievers, A. · Tucker, C. · Zylka, R.
الأصل · EN
Galaxy clusters constitute a major cosmological probe. However, Planck 2015 results have shown a weak tension between CMB-derived and cluster-derived cosmological parameters. This tension might be due to poor knowledge of the cluster mass and observable relationship. As for now, arcmin resolution Sunyaev-Zeldovich (SZ) observations (e.g. SPT, ACT and Planck) only allowed detailed studies of the intra cluster medium for low redshift clusters (z<0.2). For high redshift clusters (z>0.5) high resolution and high sensitivity SZ observations are needed. With both a wide field of view (6.5 arcmin) and a high angular resolution (17.7 and 11.2 arcsec at 150 and 260 GHz), the NIKA2 camera installed at the IRAM 30-m telescope (Pico Veleta, Spain) is particularly well adapted for these observations. The NIKA2 SZ observation program will map a large sample of clusters (50) at redshifts between 0.5 and 0.9. As a pilot study for NIKA2, several clusters of galaxies have been observed with the pathfinder, NIKA, at the IRAM 30-m telescope to cover the various configurations and observation conditions expected for NIKA2.
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