Detection of the kinematic Sunyaev-Zel'dovich effect with DES Year 1 and SPT

Romer, A K and The DES and SPT Collaborations, et al. (2016) Detection of the kinematic Sunyaev-Zel'dovich effect with DES Year 1 and SPT. Monthly Notices Of The Royal Astronomical Society, 461. pp. 3172-3193. ISSN 0035-8711

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Abstract

We detect the kinematic Sunyaev-Zel'dovich (kSZ) effect with a statistical significance of 4.2sigma 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, bar{tau}_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 bar{tau}_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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Astronomy Centre
Subjects: Q Science > QB Astronomy
Depositing User: Richard Chambers
Date Deposited: 30 Sep 2016 11:57
Last Modified: 07 Mar 2017 12:17
URI: http://sro.sussex.ac.uk/id/eprint/63744

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