Measuring weak lensing correlations of Type Ia Supernovae

Dario Scovacricchi, Bob Nichol, Edward Robert Mark Macaulay, David Bacon

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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 theMICE 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 magnitudes 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% measurement of σ8 from just these LSST supernovae (assuming 0.15 magnitudes of intrinsic dispersion). These constraints will improve significantly if the intrinsic dispersion of SNe Ia can be reduced.
Original languageEnglish
Pages (from-to)2862-2872
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume465
Issue number3
Early online date8 Nov 2016
DOIs
Publication statusPublished - 1 Mar 2017

Keywords

  • cosmology
  • cosmological parameters
  • dark energy
  • cosmology: observations
  • gravitational lensing: weak
  • supernovae: general
  • RCUK
  • STFC
  • ST/N000668/1

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