PI: Jacqueline McCleary, Brown U., Jacqueline_McCleary@brown.edu
Address: Physics Department, Box 1843, Brown University, Providence, Rhode Island 02912 USA
CoI: Ian Dell'Antonio, Brown U.
CoI: Paul Huwe, Brown U.
Title: The low-redshift end of the cluster mass substructure function
Abstract: We propose a direct measure of the mass substructure in twelve nearby ($z<0.12$) clusters of galaxies using weak gravitational lensing. The wide fields of view of DECam and ODI allow us to trace the dark matter distribution out to the virial radius of the clusters and efficiently map halo mass substructure. The depth and filter coverage of these cameras also allow us to fit the observations with photometric redshifts, enabling the isolation of contaminating signal from high- redshift galaxy clusters. The two-dimensional maps of projected mass will enable study of galaxy properties as a function of local substructure environment, and also allow the characterization of dark matter halos in cluster environments. Eventually, this work will also become the low-redshift anchor to a systematic measurement of the evolution of mass substructure in clusters of galaxies. Combined with our existing data on twelve clusters, and a further 12 targets for which we will propose in 2016B, this study would greatly deepen our understanding of the properties of dark matter and how the first galaxies assembled themselves into clusters.
Program Type: Standard/Extragalactic
Run 1 (2016A): CT-4m/DECam -- 4n on Apr 03 - Apr 06 2016
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360