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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The effect of weak lensing on distance estimates from supernovae
Astrophysical Journal, Volume 780, No. 1, Article 24, Year 2014
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Description
Using a sample of 608 Type Ia supernovae from the SDSS-II and BOSS surveys, combined with a sample of foreground galaxies from SDSS-II, we estimate the weak lensing convergence for each supernova line of sight. We find that the correlation between this measurement and the Hubble residuals is consistent with the prediction from lensing (at a significance of 1.7σ). Strong correlations are also found between the residuals and supernova nuisance parameters after a linear correction is applied. When these other correlations are taken into account, the lensing signal is detected at 1.4σ. We show, for the first time, that distance estimates from supernovae can be improved when lensing is incorporated, by including a new parameter in the SALT2 methodology for determining distance moduli. The recovered value of the new parameter is consistent with the lensing prediction. Using cosmic microwave background data from WMAP7, H 0 data from Hubble Space Telescope and Sloan Digital Sky Survey (SDSS) Baryon acoustic oscillations measurements, we find the best-fit value of the new lensing parameter and show that the central values and uncertainties on Ωm and w are unaffected. The lensing of supernovae, while only seen at marginal significance in this low-redshift sample, will be of vital importance for the next generation of surveys, such as DES and LSST, which will be systematics-dominated. © 2014. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Smith, Matthew W.L.
South Africa, Bellville
University of the Western Cape
South Africa, Cape Town
South African Astronomical Observatory
Bacon, David J.
United Kingdom, Portsmouth
University of Portsmouth
Nichol, Robert C.
United Kingdom, Portsmouth
University of Portsmouth
Campbell, Heather C.
United Kingdom, Portsmouth
University of Portsmouth
Clarkson, Chris A.
South Africa, Cape Town
University of Cape Town
Maartens, Roy
South Africa, Bellville
University of the Western Cape
United Kingdom, Portsmouth
University of Portsmouth
D'Andrea, Chris B.
United Kingdom, Portsmouth
University of Portsmouth
Bassett, Bruce A.C.C.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Muizenberg
African Institute for Mathematical Sciences
Cinabro, David A.
United States, Detroit
Wayne State University
Finley, David A.
United States, Batavia
Fermi National Accelerator Laboratory
Frieman, Joshua A.
United States, Batavia
Fermi National Accelerator Laboratory
United States, Chicago
The Kavli Institute for Cosmological Physics
United States, Chicago
The University of Chicago
Galbany, Lluís
Portugal, Lisbon
Instituto Superior Técnico
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Garnavich, Peter M.
United States, Notre Dame
University of Notre Dame
Olmstead, Matthew D.
United States, Salt Lake City
The University of Utah
P. Schneider, Donald P.
United States, University Park
Pennsylvania State University
Shapiro, Charles
United States, Pasadena
Jet Propulsion Laboratory
Sollerman, Jesper
Sweden, Stockholm
Oskar Klein Centre
Statistics
Citations: 41
Authors: 17
Affiliations: 16
Identifiers
Doi:
10.1088/0004-637X/780/1/24
ISSN:
0004637X
e-ISSN:
15384357
Study Design
Cross Sectional Study
Study Approach
Quantitative