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We present a combined tomographic weak gravitational lensing analysis of the Kilo Degree Survey (KV450) and the Dark Energy Survey (DES-Y1). We homogenize the analysis of these two public cosmic shear datasets by adopting consistent priors and modeling of nonlinear scales, and determine new redshift distributions for DES-Y1 based on deep public spectroscopic surveys. Adopting these revised redshifts results in a 0:8δ reduction in the DES-inferred value for S8, which decreases to a 0:5δ reduction when including asystematic redshift calibration error model from mock DES data based on the MICE2 simulation. The combined KV450 + DES-Y1 constraint on S 8 = 0:762+0:025-0:024 is in tension with the Planck 2018 constraint from the cosmic microwave background at the level of 2:5δ. This result highlights the importance of developing methods to provide accurate redshift calibration for current and future weak lensing surveys.
|Number of pages||8|
|Journal||Astronomy and Astrophysics|
|Early online date||29 May 2020|
|Publication status||Published - 1 Jun 2020|
FingerprintDive into the research topics of 'KiDS+VIKING-450 and DES-Y1 combined: Cosmology with cosmic shear'. Together they form a unique fingerprint.
- 1 Finished
GLOBE: Global Lensing Observations to go Beyond Einstein (027451/1)
1/11/15 → 31/10/21