NOAO >   Observing Info >   Approved Programs >   2019B-0209

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Program Information for 2019B-0209


PI: Justin Myles, Stanford U., jmyles@stanford.edu
Address: Department of Physics, 382 Via Pueblo Mall, Stanford, CA 94305 USA

CoI: Daniel Gruen, Stanford U.
CoI: Steven Allen, Stanford U.
CoI: Rebecca Canning, Stanford U.
CoI: Matteo Costanzi, Osservatorio Astronomico di Trieste
CoI: Adam Mantz, Stanford U.
CoI: Glenn Morris, Stanford U.
CoI: Eli Rykoff, SLAC
CoI: Chun-Hao To, Stanford U.
CoI: Risa Wechsler, Stanford U.
CoI: Alfredo Zenteno, CTIO

Title: Enabling precision optical cluster cosmology with WIYN

Abstract: The assembly of galaxy clusters over cosmic time is an extremely sensitive probe of dark energy. Optical surveys such as SDSS, DES and the upcoming LSST detect clusters in large volumes, out to substantial redshift, and down to moderate masses. The main optical observable, called richness, is the (probability weighted) count of optical cluster members. Crucially, the observed richness is contaminated by galaxies projected within $approx100$Mpc along the line of sight. To enable robust cosmological constraints from optical cluster counts, current models for projections must be refined, validated, and constrained with the help of statistically representative spectroscopy of putative cluster members. We propose a spectroscopic survey of all cluster members for a richness-redshift selected set of 19 clusters at low redshift, for which high-quality Chandra X-ray data precisely constrains individual cluster masses. WIYN Hydra is the optimal instrument based on its light collecting power, number of fibers, and FoV to complete the existing spectroscopic observations of these clusters. Our complete richness-redshift selected sample in conjunction with existing X-ray data will enable greatly refined tests of our cosmological model with optically detected clusters.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2019B):  WIYN/HYDR -- 3n on Sep 13 - Sep 15 2019


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2019B-0209

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