Measuring weak lensing correlations of Type Ia supernovae

Scovacricchi, D., Nichol, R. C., Macaulay, E. and Bacon, D. (2017) Measuring weak lensing correlations of Type Ia supernovae. Monthly Notices of the Royal Astronomical Society, 465 3: 2862-2872. doi:10.1093/mnras/stw2878

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Author Scovacricchi, D.
Nichol, R. C.
Macaulay, E.
Bacon, D.
Title Measuring weak lensing correlations of Type Ia supernovae
Journal name Monthly Notices of the Royal Astronomical Society   Check publisher's open access policy
ISSN 1365-2966
Publication date 2017-03-01
Year available 2016
Sub-type Article (original research)
DOI 10.1093/mnras/stw2878
Open Access Status File (Publisher version)
Volume 465
Issue 3
Start page 2862
End page 2872
Total pages 11
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Language eng
Formatted abstract
We study the feasibility of detecting weak lensing spatial correlations between supernova (SN) Type Ia magnitudes with present (Dark Energy Survey, DES) and future (Large Synoptic Survey Telescope, LSST) surveys. We investigate the angular auto-correlation function of SN magnitudes (once the background cosmology has been subtracted) and cross-correlation with galaxy catalogues. We examine both analytical and numerical predictions, the latter using simulated galaxy catalogues from the MICE Grand Challenge Simulation. We predict that we will be unable to detect the SN auto-correlation in DES, while it should be detectable with the LSST SN deep fields (15 000 SNe on 70 deg2) at ≃6σ level of confidence (assuming 0.15 mag of intrinsic dispersion). The SN-galaxy cross-correlation function will deliver much higher signal to noise, being detectable in both surveys with an integrated signal to noise of ~100 (up to 30 arcmin separations). We predict joint constraints on the matter density parameter (Ωm) and the clustering amplitude (σ8) by fitting the auto-correlation function of our mock LSST deep fields. When assuming a Gaussian prior for Ωm, we can achieve a 25 per cent measurement of σ8 from just these LSST supernovae (assuming 0.15 mag of intrinsic dispersion). These constraints will improve significantly if the intrinsic dispersion of SNe Ia can be reduced.
Keyword Cosmological parameters
Cosmology: observations
Gravitational lensing: weak
Supernovae: general
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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