N2CLS COSMOS field NIKA2 galaxy cluster cand.

We then use a matched-filter algorithm to extract cluster candidates assuming a universal pressure profile to model the expected cluster tSZ signal. We compute the purity and completeness of the sample by applying the previous algorithm to simulated maps of the sky signal in the COSMOS field, including tSZ contribution, point sources and instrumental noise. We find a total of 16 cluster candidates at S/N>4, from which 8 have either an optical or X-ray cluster (or group of galaxies) counterpart.

This is the first blind detection of clusters of galaxies at mm wavelengths at 18arcsec angular resolution. For candidates with available redshift estimates, we derive their mass by modeling the cluster tSZ signal with a universal pressure profile via a MCMC analysis. From this analysis, we confirm that NIKA2 and the IRAM 30-m telescope should be sensitive to low mass clusters at intermediate and high redshift, complementing current and planned large tSZ-based cluster surveys.