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Detection of the kinematic Sunyaev-Zel'dovich effect with DES Year 1 and SPT
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abstract
We detect the kinematic Sunyaev-Zel'dovich (kSZ) effect with a statistical significance of $4.2 \sigma$ by combining a cluster catalogue derived from the first year data of the Dark Energy Survey (DES) with CMB temperature maps from the South Pole Telescope Sunyaev-Zel'dovich (SPT-SZ) 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, $\bar{\tau}_e = (3.75 \pm 0.89)\cdot 10^{-3}$. 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 $ \gtrsim 100$ Mpc.
Forward citations
Cited by 7 Pith papers
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Mapping the gas density with the kinematic Sunyaev-Zel'dovich and patchy screening effects: a self-consistent comparison
A 7.2-sigma kSZ detection and a 4.1-sigma patchy screening signal around DESI LRGs, with the screening signal attributed mostly to CMB lensing, leaving a 95% upper limit tau < 2.5e-4 for the gas optical depth.
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Towards a multi-tracer neutrino mass measurement with line-intensity mapping
AtLAST [CII] line-intensity mapping, combined with CMB-S4 and DESI BAO forecasts, could reach sigma(sum m_nu) ~ 18 meV, and ~11.5 meV with a 21-cm tau prior.
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Constraints on local primordial non-Gaussianity with 3d Velocity Reconstruction from the Kinetic Sunyaev-Zeldovich Effect
The first 3D kSZ velocity reconstruction yields a 7.2-sigma galaxy-velocity cross-correlation and a constraint fNL = -90 +210 -350, still consistent with zero.
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The Cosmic Microwave Background -- Secondary Anisotropies
A comprehensive review of the physics, observational status, and future prospects of CMB secondary anisotropies, containing no new results.
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