publication . Article . Preprint . 2017

Imprint of DES superstructures on the cosmic microwave background

Attila Kovács; C. Sánchez; Juan Garcia-Bellido; Seshadri Nadathur; Robert Crittenden; Daniel Gruen; Dragan Huterer; David Bacon; Joseph Clampitt; Joseph DeRose; ...
Open Access English
  • Published: 01 Mar 2017
  • Publisher: HAL CCSD
Abstract
Small temperature anisotropies in the Cosmic Microwave Background can be sourced by density perturbations via the late-time integrated Sachs-Wolfe 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 in a different footprint, and using a different super-structure 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 $\Delta T_{f} \approx -5.0\pm3.7~\mu K$ and a hot imprint of superclusters $\Delta T_{f} \approx 5.1\pm3.2~\mu K$ ; this is $\sim1.2\sigma$ higher than the expected $|\Delta T_{f}| \approx 0.6~\mu K$ imprint of such super-structures in $\Lambda$CDM. If we instead use an a posteriori selected filter size ($R/R_{v}=0.6$), we can find a temperature decrement as large as $\Delta T_{f} \approx -9.8\pm4.7~\mu K$ for voids, which is $\sim2\sigma$ above $\Lambda$CDM expectations and is comparable to previous measurements made using SDSS super-structure data.
Comment: 16 pages, 12 figures. Accepted for publication by MNRAS without further review. Author list updated
Persistent Identifiers
Subjects
free text keywords: surveys, cosmic background radiation, large-scale structure of Universe, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], Space and Planetary Science, Astronomy and Astrophysics, astro-ph.CO, RCUK, STFC, /dk/atira/pure/core/subjects/cosmology, Cosmology and Gravitation, QB, Astrophysics - Cosmology and Nongalactic Astrophysics, surveys, cosmic background radiation, large-scale structure of Universe, Cosmic background radiation, Sky, media_common.quotation_subject, media_common, Superstructure, Cold dark matter, Cosmic microwave background, Dark energy, Astrophysics, Redshift, Anisotropy, Physics
Funded by
EC| COSMOVOID
Project
COSMOVOID
Cosmology with voids and superclusters: combining theory, simulation and observation
  • Funder: European Commission (EC)
  • Project Code: 660053
  • Funding stream: H2020 | MSCA-IF-EF-ST
Validated by funder
,
NSF| Collaborative Research: The Dark Energy Survey Data Management Operations
Project
  • Funder: National Science Foundation (NSF)
  • Project Code: 1138766
  • Funding stream: Directorate for Mathematical & Physical Sciences | Division of Astronomical Sciences
,
EC| COGS
Project
COGS
Capitalizing on Gravitational Shear
  • Funder: European Commission (EC)
  • Project Code: 240672
  • Funding stream: FP7 | SP2 | ERC
,
EC| TESTDE
Project
TESTDE
Testing the Dark Energy Paradigm and Measuring Neutrino Mass with the Dark Energy Survey
  • Funder: European Commission (EC)
  • Project Code: 291329
  • Funding stream: FP7 | SP2 | ERC
,
EC| COSMICDAWN
Project
COSMICDAWN
Understanding the Origin of Cosmic Structure
  • Funder: European Commission (EC)
  • Project Code: 306478
  • Funding stream: FP7 | SP2 | ERC
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