NOAO >   Observing Info >   Approved Programs >   2018A-0276

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Program Information for 2018A-0276


PI: Ian Dell'Antonio, Brown U., ian@het.brown.edu
Address: Physics Department, Box 1843, Providence, Rhode Island 02912 USA

CoI: Jacqueline McCleary, NASA/JPL
CoI: Mingbin Leng, Brown U.
CoI: Shenming Fu, Brown U.
CoI: Binyang Liu, Brown U.

Title: Mapping dark matter in Nearby Galaxy Clusters

Abstract: We propose a direct measure of the mass distribution in six nearby ($0.03<z<0.11$) 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 use photometric redshifts to reliably select background galaxy clusters, enabling the isolation of their lensing signal. 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. The mass measurements will be used to test the effect of mass substructure on overall cluster mass measurements. These six clusters, along with eight that we will propose for in 2018 and the archival images available in the NOAO, CFHT, and Subaru archive, will allow us to form a complete sample of all 76 galaxy clusters with $L_x>2times 10^{44}$ erg/s in the local Universe. This sample will form the low-redshift anchor to measurement of the evolution of mass distribution in clusters. To provide a common analysis framework, we will use LSST Data Management Software stack to measure galaxy shapes, photometry and cluster shears in images from all telescopes.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2018A):  CT-4m/DECam -- 3n on Jun 12 - Jun 14 2018
Run 2 (2018A):  WIYN/ODI -- 2n on Jun 13 - Jun 14 2018


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NOAO >   Observing Info >   Approved Programs >   2018A-0276

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