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NIKA2: a millimeter camera for cluster cosmology

Abstract : 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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Submitted on : Wednesday, May 9, 2018 - 3:58:59 PM
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  • HAL Id : in2p3-01559502, version 1
  • ARXIV : 1711.07088


J.F. Macias-Perez, R. Adam, P. Ade, P. André, M. Arnaud, et al.. NIKA2: a millimeter camera for cluster cosmology. European Physical Society Conference on High Energy Physics (EPS-HEP2017), Jul 2017, Venice, Italy. pp.042. ⟨in2p3-01559502⟩



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