Soergel, B;
Flender, S;
Story, KT;
Bleem, L;
Giannantonio, T;
Efstathiou, G;
Rykoff, E;
... Whitehorn, N; + view all
(2016)
Detection of the kinematic Sunyaev-Zel'dovich effect with DES Year 1 and SPT.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
, 461
(3)
pp. 3172-3193.
10.1093/mnras/stw1455.
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Abstract
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 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 τ¯e , and the corresponding gas fraction. 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.
| Type: | Article |
|---|---|
| Title: | Detection of the kinematic Sunyaev-Zel'dovich effect with DES Year 1 and SPT |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stw1455 |
| Publisher version: | http://dx.doi.org/10.1093/mnras/stw1455 |
| Additional information: | © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society |
| Keywords: | galaxies: clusters: general, 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/1540199 |
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