Vielzeuf, P;
Kovács, A;
Demirbozan, U;
Fosalba, P;
Baxter, E;
Hamaus, N;
Huterer, D;
... Zuntz, J; + view all
(2021)
Dark energy survey year 1 results: The lensing imprint of cosmic voids on the cosmic microwave background.
Monthly Notices of the Royal Astronomical Society
, 500
(1)
pp. 464-480.
10.1093/mnras/staa3231.
(In press).
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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 Marenostrum Institut de Ciencias de l’Espai (MICE) N-body simulation to calibrate our detection strategy for a given void definition and galaxy tracer density. We then identify cosmic voids in Dark Energy Survey (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-fitting 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.
| Type: | Article |
|---|---|
| Title: | Dark energy survey year 1 results: The lensing imprint of cosmic voids on the cosmic microwave background |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/staa3231 |
| Publisher version: | http://dx.doi.org/10.1093/mnras/staa3231 |
| Language: | English |
| Additional information: | © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model) |
| Keywords: | cosmic background radiation, large-scale structure of Universe |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10118105 |
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