Dark Energy Survey Year 1 Results: the lensing imprint of cosmic voids on the cosmic microwave background

Dark Energy Survey Collaboration, S. Nadathur, S. Avila, D. Thomas

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Abstract

Cosmic voids gravitationally lens the cosmic microwave background (CMB) radiation, resulting in a distinct imprint on degree scales. We use the simulated CMB lensing convergence map from the MICE N-body simulation to calibrate our detection strategy for a given void definition and galaxy tracer density. We then identify cosmic voids in DES Year 1 data and stack the Planck 2015 lensing convergence map on their locations, probing the consistency of simulated and observed void lensing signals. When fixing the shape of the stacked convergence profile to that calibrated from simulations, we find imprints at the 3σ significance level for various analysis choices. The best measurement strategies based on the MICE calibration process yield S/N ≈ 4 for DES Y1, and the best-fit amplitude recovered from the data is consistent with expectations from MICE (A ≈ 1). Given these results as well as the agreement between them and N-body simulations, we conclude that the previously reported excess integrated Sachs-Wolfe (ISW) signal associated with cosmic voids in DES Y1 has no counterpart in the Planck CMB lensing map.
Original languageEnglish
Pages (from-to)464-480
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Volume500
Issue number1
Early online date22 Oct 2020
DOIs
Publication statusPublished - 1 Jan 2021

Keywords

  • large-scale structure of Universe
  • cosmic background radiation
  • RCUK
  • STFC

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