High-resolution mapping of the hot gas in galaxy clusters is a key tool for cluster-based cosmological analyses. Taking advantage of the NIKA2 millimeter camera operated at the IRAM 30-m telescope, the NIKA2 SZ Large Program seeks to get a high-resolution follow-up of 45 galaxy clusters covering a wide mass range at high redshift in order to re-calibrate some of the tools needed for the cosmological exploitation of SZ surveys. We present the second cluster analysis of this program, targeting one of the faintest sources of the sample in order to tackle the difficulties in data reduction for such faint, low-SNR clusters. In this study, the main challenge is the precise estimation of the contamination by sub-millimetric point sources, which greatly affects the tSZ map of the cluster. We account for this contamination by performing a joint fit of the SZ signal and of the flux density of the compact sources. A prior knowledge of these fluxes is given by the adjustment of the SED of each source using data from both NIKA2 and the \textit{Herschel} satellite. The first results are very promising and demonstrate the possibility to estimate thermodynamic properties with NIKA2, even in a compact cluster heavily contaminated by point sources.
@article{arxiv.1911.03005,
title = {A low-mass galaxy cluster as a test-case study for the NIKA2 SZ Large Program},
author = {F. Kéruzoré and R. Adam and P. Ade and P. André and A. Andrianasolo and M. Arnaud and H. Aussel and I. Bartalucci and A. Beelen and A. Benoît and A. Bideaud and O. Bourrion and M. Calvo and A. Catalano and B. Comis and M. De Petris and F. -X. Désert and S. Doyle and E. F. C. Driessen and A. Gomez and J. Goupy and C. Kramer and B. Ladjelate and G. Lagache and S. Leclercq and J. -F. Lestrade and J. F. Macías-Pérez and P. Mauskopf and F. Mayet and A. Monfardini and L. Perotto and G. Pisano and E. Pointecouteau and N. Ponthieu and G. W. Pratt and V. Revéret and A. Ritacco and C. Romero and H. Roussel and F. Ruppin and K. Schuster and S. Shu and A. Sievers and C. Tucker and R. Zylka},
journal= {arXiv preprint arXiv:1911.03005},
year = {2020}
}
Comments
7 pages, to appear in the proceedings of the international conference entitled mm Universe @ NIKA2, Grenoble (France), June 2019, EPJ Web of conferences