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This content will become publicly available on June 17, 2017

Title: Detection of the kinematic Sunyaev–Zel'dovich effect with DES Year 1 and SPT

We detect the kinematic Sunyaev-Zel'dovich (kSZ) effect with a statistical significance of 4.2σ by combining a cluster catalogue derived from the first year data of the Dark Energy Survey with cosmic microwave background temperature maps from the South Pole Telescope Sunyaev-Zel'dovich Survey. This measurement is performed with a differential statistic that isolates the pairwise kSZ signal, providing the first detection of the large-scale, pairwise motion of clusters using redshifts derived from photometric data. By fitting the pairwise kSZ signal to a theoretical template, we measure the average central optical depth of the cluster sample, τ¯e=(3.75±0.89)×10–3. We compare the extracted signal to realistic simulations and find good agreement with respect to the signal to noise, the constraint on τ¯e, and the corresponding gas fraction. As a result, high-precision measurements of the pairwise kSZ signal with future data will be able to place constraints on the baryonic physics of galaxy clusters, and could be used to probe gravity on scales ≳100 Mpc.
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Publication Date:
OSTI Identifier:
1333878
Report Number(s):
DES--2015-0154, Fermilab PUB-16-036-AE
Journal ID: ISSN 0035-8711
Grant/Contract Number:
AC02-SF00515
Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 461; Journal Issue: 3; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Research Org:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
The DES and SPT Collaborations
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS galaxies: clusters: general; cosmic background radiation; large-scale structure of Universe