Abstract
We consider the effects of weak gravitational lensing on observations of 196 spectroscopically confirmed Type Ia Supernovae (SNe Ia) from years 1 to 3 of the Dark Energy Survey (DES).We simultaneously measure both the angular correlation function and the non-Gaussian skewness caused by weak lensing. This approach has the advantage of being insensitive to the intrinsic dispersion of SNe Ia magnitudes. We model the amplitude of both effects as a function of σ8, and find σ8 =1.2+0.9-0.8. We also apply our method to a subsample of 488 SNe from the Joint Light-curve Analysis (JLA; chosen to match the redshift range we use for this work), and find σ8 =0.8+1.1-0.7. The comparable uncertainty in σ8 between DES-SN and the larger number of SNe from JLA highlights the benefits of homogeneity of the DES-SN sample, and improvements in the calibration and data analysis.
Original language | English (US) |
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Pages (from-to) | 4051-4059 |
Number of pages | 9 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 496 |
Issue number | 3 |
DOIs | |
State | Published - 2020 |
Keywords
- Cosmological parameters
- Cosmology: Observations
- Large-scale structure of the universe
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science