Kavli Affiliate: Lindsey Bleem
| Summary:
We report a new galaxy cluster catalog, selected using the thermal Sunyaev-Zel’dovich (SZ) effect, from 5 years of observations of the SPT-3G Main field. Drawn from arcminute-resolution data with white noise levels of 3.2, 2.5, and 8.9 $μ$K-arcmin at 95, 150, and 220 GHz, respectively, the sample consists of 8,892 cluster candidates detected above significance $ξ=4$, with an expected purity of $>82%$ (4,480 at $ξge5$ with purity $>99%$). Using optical and infrared data we have confirmed 7,190 candidates as clusters. The sample spans a mass range $7.9 times 10^13$ $M_odot/h_70$ $< M_textrm500c < $ $1.6 times 10^15$ $M_odot/h_70$ with a median mass of $1.65 times 10^14$ $M_odot/h_70$, and a redshift range of $0.037<zlesssim 2$ with a median redshift of $z_textrmmed$ = 0.73; 1,780 clusters are at $z>1$ and 271 at $z>1.5$. Compared to previous SZ cluster samples from South Pole Telescope and Atacama Cosmology Telescope data, the SPT-3G sample is highly consistent in mass and redshift but is significantly deeper, with per-cluster detection signal-to-noise 2-4 times higher and a cluster density of 4.5 confirmed clusters/deg$^2$. We cross match with eRASS1 cluster and point source catalogs, finding 1,279 and 1,319 matches, respectively. The SPT and eROSITA cluster mass estimates are in relatively good agreement. We perform a series of validation checks using both internal data splits and comparisons to external samples. These tests show increasing correlated (dusty) emission with redshift, with a $sim17times$ larger 220 GHz temperature increment for clusters at $zsim1.5$ than $zsim0.25$, but only weak evidence for correlated synchrotron emission. Finally, a number of clusters are flagged as candidate strong gravitational lenses.
| Search Query: arXiv Query: search_query=au:”Bleem Lindsey”&id_list=&start=0&max_results=10
Read More