CT-CL J0215.4+0030: a test case for faint galaxy clusters within the NIKA2 SZ Large Program

4 Jun 2019, 11:30


Mr Florian Kéruzoré (LPSC Grenoble)


The NIKA2 SZ large program (LPSZ) was designed to take advantage of the NIKA2 high angular resolution and large eld of view to help us improve our knowledge of galaxy clusters. It consists in observing ∼50 clusters from intermediate to high red- shift (z ∈ [0.5, 0.9]) to re-compute the relations needed for cluster-based cosmological analysis, i.e. the mean pressure pro le of the intra-cluster medium, and the SZ observ- able – mass scaling relation. The rst analysis of a galaxy cluster within the NIKA2 LPSZ was published in Ruppin et al. 2018, as a science veri cation of the abilities of the NIKA2 camera on a high quality galaxy cluster (with low-z, high mass, and a large observing time). The most natural next step for the LPSZ is then to move on to the analysis of a trickier source, to evaluate how much can be expected from the individual analysis of standard LPSZ clusters. In this presentation, I will show the analysis of the ACT-CL J0215.4+0030 galaxy cluster, which is the one with the highest redshift and the lowest mass in the sample for which the observations have been completed. I will show how challenging data reduction can be for low SNR clusters, in which case the contamination by point sources becomes crucial and may worsen the quality of our analysis.

Primary author

Mr Florian Kéruzoré (LPSC Grenoble)

Presentation Materials