The effect of weak lensing on distance estimates from supernovae

Mathew Smith, David J. Bacon, Robert C. Nichol, Heather Campbell, Chris Clarkson, Roy Maartens, Chris B. D'Andrea, Bruce A. Bassett, David Cinabro, David A. Finley, Joshua A. Frieman, Lluis Galbany, Peter M. Garnavich, Matthew D. Olmstead, Donald P. Schneider, Charles Shapiro, Jesper Sollerman

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Article number24
JournalAstrophysical Journal
Volume780
Issue number1
DOIs
StatePublished - Jan 1 2014

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supernovae
estimates
acoustic survey
prediction
predictions
Hubble Space Telescope
oscillation
line of sight
baryons
methodology
parameter
effect
galaxies
microwaves
oscillations
acoustics

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Smith, M., Bacon, D. J., Nichol, R. C., Campbell, H., Clarkson, C., Maartens, R., ... Sollerman, J. (2014). The effect of weak lensing on distance estimates from supernovae. Astrophysical Journal, 780(1), [24]. https://doi.org/10.1088/0004-637X/780/1/24
Smith, Mathew ; Bacon, David J. ; Nichol, Robert C. ; Campbell, Heather ; Clarkson, Chris ; Maartens, Roy ; D'Andrea, Chris B. ; Bassett, Bruce A. ; Cinabro, David ; Finley, David A. ; Frieman, Joshua A. ; Galbany, Lluis ; Garnavich, Peter M. ; Olmstead, Matthew D. ; Schneider, Donald P. ; Shapiro, Charles ; Sollerman, Jesper. / The effect of weak lensing on distance estimates from supernovae. In: Astrophysical Journal. 2014 ; Vol. 780, No. 1.
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Smith, M, Bacon, DJ, Nichol, RC, Campbell, H, Clarkson, C, Maartens, R, D'Andrea, CB, Bassett, BA, Cinabro, D, Finley, DA, Frieman, JA, Galbany, L, Garnavich, PM, Olmstead, MD, Schneider, DP, Shapiro, C & Sollerman, J 2014, 'The effect of weak lensing on distance estimates from supernovae', Astrophysical Journal, vol. 780, no. 1, 24. https://doi.org/10.1088/0004-637X/780/1/24

The effect of weak lensing on distance estimates from supernovae. / Smith, Mathew; Bacon, David J.; Nichol, Robert C.; Campbell, Heather; Clarkson, Chris; Maartens, Roy; D'Andrea, Chris B.; Bassett, Bruce A.; Cinabro, David; Finley, David A.; Frieman, Joshua A.; Galbany, Lluis; Garnavich, Peter M.; Olmstead, Matthew D.; Schneider, Donald P.; Shapiro, Charles; Sollerman, Jesper.

In: Astrophysical Journal, Vol. 780, No. 1, 24, 01.01.2014.

Research output: Contribution to journalArticle

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AU - Smith, Mathew

AU - Bacon, David J.

AU - Nichol, Robert C.

AU - Campbell, Heather

AU - Clarkson, Chris

AU - Maartens, Roy

AU - D'Andrea, Chris B.

AU - Bassett, Bruce A.

AU - Cinabro, David

AU - Finley, David A.

AU - Frieman, Joshua A.

AU - Galbany, Lluis

AU - Garnavich, Peter M.

AU - Olmstead, Matthew D.

AU - Schneider, Donald P.

AU - Shapiro, Charles

AU - Sollerman, Jesper

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Smith M, Bacon DJ, Nichol RC, Campbell H, Clarkson C, Maartens R et al. The effect of weak lensing on distance estimates from supernovae. Astrophysical Journal. 2014 Jan 1;780(1). 24. https://doi.org/10.1088/0004-637X/780/1/24