The effects of varying depth in cosmic shear surveys

Abstract

We present a semi-analytic model for the shear two-point correlation function of a cosmic shear survey with non-uniform depth. Ground-based surveys are subject to depth variations that primarily arise through varying atmospheric conditions. For a survey like the Kilo-Degree Survey (KiDS), we find that the measured depth variation increases the amplitude of the observed shear correlation function at the level of a few percent out to degree-scales, relative to the assumed uniform-depth case. The impact on the inferred cosmological parameters is shown to be insignificant for a KiDS-like survey. For next-generation cosmic shear experiments, however, we conclude that variable depth should be accounted for.

References in corpus (7)

• The fourth data release of the Kilo-Degree Survey: ugri imaging and nine-band optical-IR photometry over 1000 square degrees
• The Intrinsic Alignment of Galaxies and its Impact on Weak Gravitational Lensing in an Era of Precision Cosmology
• KiDS-450: The tomographic weak lensing power spectrum and constraints on cosmological parameters
• Dark sector interaction: a remedy of the tensions between CMB and LSS data
• KiDS+VIKING-450 and DES-Y1 combined: Mitigating baryon feedback uncertainty with COSEBIs
• Mock galaxy shape catalogs in the Subaru Hyper Suprime-Cam Survey
• Redshift and Shear Calibration: Impact on Cosmic Shear Studies and Survey Design