Risa H. Wechsler

TL;DR: In this article, the authors measured the excess mass density profile above the universal mean for clusters in bins of richness and optical luminosity, and de-projected the profiles to produce three-dimensional mass and light profiles over scales from 25 h −1 kpc to 22 h -1 Mpc.

TL;DR: In this paper, a large cosmological N-body simulation coupled with a well-tested semi-analytic substructure model is used to demonstrate that the majority of galaxies in close pairs reside within cluster or group-size halos and therefore represent a biased population, poorly suited for direct comparison to 'field' galaxies.

TL;DR: In this article, the authors proposed to use a large set of objects with known redshifts to map out the relationship between object color and z, which is the key application of galaxy spectroscopy for imaging-based dark energy experiments.

TL;DR: In this article, a new void finder for photometric surveys was proposed by projecting galaxies into 2D slices and finding voids in the smoothed 2D galaxy density field of the slice Fixing the line-of-sight size of the slices to be at least twice the photo-z scatter, the number of voids found in these projected slices of simulated spectroscopic and photometric galaxy catalogs is within 20% for all transverse void sizes.

TL;DR: The status of the DESI and its plans and opportunities for the coming decade are discussed in this paper, with a focus on wide field spectroscopy and the future of the instrument.