Weak lensing of Type Ia Supernovae from the Dark Energy Survey

E. Macaulay*, D. Bacon, R. C. Nichol, T. M. Davis, J. Elvin-Poole, D. Brout, D. Carollo, K. Glazebrook, S. R. Hinton, G. F. Lewis, C. Lidman, A. Möller, M. Sako, D. Scolnic, M. Smith, N. E. Sommer, B. E. Tucker, T. M.C. Abbott, M. Aguena, J. AnnisS. Avila, E. Bertin, S. Bhargava, D. Brooks, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, F. J. Castander, M. Costanzi, L. N.D. Da Costa, S. Desai, H. T. Diehl, P. Doel, B. Flaugher, R. J. Foley, J. García-Bellido, E. Gaztanaga, D. W. Gerdes, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutierrez, D. L. Hollowood, K. Honscheid, D. Huterer, D. J. James, K. Kuehn, N. Kuropatkin, O. Lahav

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

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 languageEnglish
Pages (from-to)4051-4059
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume496
Issue number3
Early online date29 Jun 2020
DOIs
Publication statusPublished - Aug 2020

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