Optimizing the LSST Observing Strategy for Dark Energy Science: DESC Recommendations for the Wide-Fast-Deep Survey
Abstract
Cosmology is one of the four science pillars of LSST, which promises to be transformative for our understanding of dark energy and dark matter. The LSST Dark Energy Science Collaboration (DESC) has been tasked with deriving constraints on cosmological parameters from LSST data. Each of the cosmological probes for LSST is heavily impacted by the choice of observing strategy. This white paper is written by the LSST DESC Observing Strategy Task Force (OSTF), which represents the entire collaboration, and aims to make recommendations on observing strategy that will benefit all cosmological analyses with LSST. It is accompanied by the DESC DDF (Deep Drilling Fields) white paper (Scolnic et al.). We use a variety of metrics to understand the effects of the observing strategy on measurements of weak lensing, large-scale structure, clusters, photometric redshifts, supernovae, strong lensing and kilonovae. In order to reduce systematic uncertainties, we conclude that the current baseline observing strategy needs to be significantly modified to result in the best possible cosmological constraints. We provide some key recommendations: moving the WFD (Wide-Fast-Deep) footprint to avoid regions of high extinction, taking visit pairs in different filters, changing the 2x15s snaps to a single exposure to improve efficiency, focusing on strategies that reduce long gaps (>15 days) between observations, and prioritizing spatial uniformity at several intervals during the 10-year survey.
Cite
@article{arxiv.1812.00515,
title = {Optimizing the LSST Observing Strategy for Dark Energy Science: DESC Recommendations for the Wide-Fast-Deep Survey},
author = {Michelle Lochner and Daniel M. Scolnic and Humna Awan and Nicolas Regnault and Philippe Gris and Rachel Mandelbaum and Eric Gawiser and Husni Almoubayyed and Christian N. Setzer and Simon Huber and Melissa L. Graham and Renée Hložek and Rahul Biswas and Tim Eifler and Daniel Rothchild and Tarek Allam and Jonathan Blazek and Chihway Chang and Thomas Collett and Ariel Goobar and Isobel M. Hook and Mike Jarvis and Saurabh W. Jha and Alex G. Kim and Phil Marshall and Jason D. McEwen and Marc Moniez and Jeffrey A. Newman and Hiranya V. Peiris and Tanja Petrushevska and Jason Rhodes and Ignacio Sevilla-Noarbe and Anže Slosar and Sherry H. Suyu and J. Anthony Tyson and Peter Yoachim},
journal= {arXiv preprint arXiv:1812.00515},
year = {2018}
}
Comments
The LSST DESC response (WFD) to the Call for White Papers on LSST Cadence Optimization. Comments welcome