10-1093-mnras-stw2968.pdf (8.96 MB)
Imprint of DES superstructures on the cosmic microwave background
journal contribution
posted on 2023-06-09, 05:03 authored by Kathy RomerKathy Romer, The Dark Energy SurveySmall temperature anisotropies in the cosmic microwave background (CMB) can be sourced by density perturbations via the late-time integrated Sachs-Wolfe (ISW) effect. Large voids and superclusters are excellent environments to make a localized measurement of this tiny imprint. In some cases excess signals have been reported. We probed these claims with an independent data set, using the first year data of the Dark Energy Survey (DES) in a different footprint, and using a different superstructure finding strategy. We identified 52 large voids and 102 superclusters at redshifts 0.2 < z < 0.65. We used the Jubilee simulation to a priori evaluate the optimal ISW measurement configuration for our compensated top-hat filtering technique, and then performed a stacking measurement of the CMB temperature field based on the DES data. For optimal configurations, we detected a cumulative cold imprint of voids with DeltaTf ˜ -5.0 ± 3.7 muK and a hot imprint of superclusters DeltaTf ˜ 5.1 ± 3.2 muK; this is ˜1.2sigma higher than the expected |DeltaTf| ˜ 0.6 muK imprint of such superstructures in Lambda cold dark matter (LambdaCDM). If we instead use an a posteriori selected filter size (R/Rv = 0.6), we can find a temperature decrement as large as DeltaTf ˜ -9.8 ± 4.7 muK for voids, which is ˜2sigma above LambdaCDM expectations and is comparable to previous measurements made using Sloan Digital Sky Survey superstructure data.
Funding
STFC Consolidated Grant Supplement; G1316; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/M000753/1
History
Publication status
- Published
File Version
- Published version
Journal
Monthly Notices of the Royal Astronomical SocietyISSN
0035-8711Publisher
Oxford University PressExternal DOI
Issue
4Volume
465Page range
4166-4179Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Astronomy Centre Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2017-02-06First Open Access (FOA) Date
2017-02-06First Compliant Deposit (FCD) Date
2017-02-06Usage metrics
Categories
No categories selectedKeywords
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC