http://arxiv.org/abs/2004.00170
We present weak lensing cluster search using Hyper Suprime-Cam Subaru Strategic Program (HSC survey) first-year data. We pay a special attention to the dilution effect of cluster member and foreground galaxies on weak lensing peak signal-to-noise ratios ($SN$s); we adopt the globally normalized weak lensing estimator which is least affected by cluster member galaxies, and we select source galaxies by using photometric redshift information to mitigate the effect of foreground galaxies. We produce six samples of source galaxies with different low-$z$ galaxy cuts, construct weak lensing mass maps for each of source sample, and search for high peaks in the mass maps that cover the effective survey area of $\sim$120 deg$^2$. We compile six catalogs of high peaks into the sample of cluster candidates which contains 124 high peaks with $SN\ge 5$. We cross-match the peak sample with the public optical cluster catalog constructed from the same HSC survey data to identify cluster counterparts of the peaks. We find that 107 out of 124 peaks have matched clusters within 5 arcmin from peak positions. Among them, we define a sub-sample of 64 secure clusters that we use to examine dilution effects on our weak lensing peak finding. We find that source samples with the low-$z$ galaxy cuts mitigate the dilution effect on peak $SN$s of high-$z$ clusters ($z > 0.3$), and thus combining multiple peak catalogs from different source samples improves the efficiency of weak lensing cluster searches.
T. Hamana, M. Shirasaki and Y. Lin
Thu, 2 Apr 20
50/56
Comments: 30 pages, 12 figures, submitted to PASJ, comments welcome. A version with full resolution figures and additional information about weak lensing peaks are available from this http URL