Optimizing LSST Observing Strategies for Large-Scale Structures Systematics (Humna Awan; Rutgers University)

Desde Agosto 17, 2017 13:15 hasta Agosto 17, 2017 13:45

En Instituto de Astrofísica, Pontificia Universidad Católica, Vicuña Mackenna 4860, Santiago, Chile

Categorías: Seminarios

The Large Synoptic Survey Telescope (LSST) will start a ten-year survey of the southern sky in 2022. Since the telescope observing strategy can lead to artifacts in the observed data, we study the impacts of the artifacts induced by the observing strategy on large-scale structure systematics. We show how these artifacts are tied to window function uncertainties and hence set a constraint on the level of information we can extract from an optimized survey to precisely measure Baryonic Acoustic Oscillations at high redshifts. As a means to minimize the induced uncertainties, we implement large telescope-pointing offsets (called dithers) and analyze their impacts after the full 10-year survey as well after only the first year. We also explore different cadences and demonstrate that the best dither strategies minimize the induced uncertainties for various cadences while a wider coverage footprint with effective dithers is strongly preferred, especially for the first year.