The impact of galaxy selection on the splashback boundaries of galaxy clusters
The impact of galaxy selection on the splashback boundaries of galaxy clusters
复制标题
星系选择对星系团溅射边界的影响
DOI：
10.1093/mnras/stac850
复制
发表时间：
2022
影响因子：
4.8
通讯作者：
Diemer, Benedikt
中科院分区：
文献类型：
--
作者：
O’Neil, Stephanie;Borrow, Josh;Vogelsberger, Mark;Diemer, Benedikt
We explore how the splashback radius (Rsp) of galaxy clusters, measured using the number density of the subhalo population, changes based on various selection criteria using the IllustrisTNG cosmological galaxy formation simulation. We identifyRspby extracting the steepest radial gradient in a stacked set of clusters in 0.5 dex wide mass bins, with our clusters having halo masses 1013≤M200,mean/M⊙≤ 1015. We apply cuts in subhalo mass, galaxy stellar mass,i-band absolute magnitude, and specific star formation rate. We find that, generally, galaxies of increasing mass and luminosity trace smaller measured splashback radii relative to the intrinsic dark matter radius. We also show that quenched galaxies may be used to reliably reconstruct the dark matter splashback radius. This trend is likely due to changes in the galaxy population. Additionally, we are able to reconcile different observational predictions thatRspbased upon galaxy number counts and dark matter may either align or show significant offset (e.g. those using optically or SZ-selected clusters) through the selection functions that these studies employ. Finally, we demonstrate that changes inRspmeasured through number counts are not due to a simple change in galaxy abundance inside and outside of the cluster.
