NOAO >   Observing Info >   Approved Programs >   2016B-0199

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Program Information for 2016B-0199


PI: Tim Schrabback, Universitat Bonn, schrabba@astro.uni-bonn.de
Address: Argelander Institute for Astronomy, Auf dem Huegel 71, Bonn 53121 Germany

CoI: Veronica Strazzullo, LMU Munich
CoI: Anja von der Linden, SUNY
CoI: Alfredo Zenteno, CTIO
CoI: Bradford Benson, U. of Chicago
CoI: Henk Hoekstra, Leiden University

Title: Pushing to new frontiers: A pilot study for cluster weak lensing at redshift z>1.4

Abstract: We propose a pilot study that complements currently obtained HST imaging with new SOAR observations for three high mass galaxy clusters discovered in the 2500 deg$^2$ SPT-SZ survey at very high redshifts $z>1.4$. We will combine high-resolution HST galaxy shape measurements with a joint SOAR+HST color selection of the significantly lensed background galaxies at $zgtrsim 2.4$ to extract the weak lensing signal of the clusters. SOAR is uniquely positioned to complement the HST $I$- band imaging thanks to the improved $R$-band resolution provided by SAMI and the high $B$-band throughput of SOI. These measurements will allow us to obtain the first weak lensing constraints on the cluster mass scale at such high redshifts for a homogeneously selected sample. This program serves as a pilot study for future investigations of large cluster samples at these redshifts, which will soon be available thanks to the latest generation of SZ experiments.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2016B):  SOAR/SAMI -- 1n on Nov 28 2016


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NOAO >   Observing Info >   Approved Programs >   2016B-0199

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