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CMB lensing tomography with the DES Science Verification galaxies

Giannantonio, T; Fosalba, P; Cawthon, R; Omori, Y; Crocce, M; Elsner, F; Leistedt, B; ... Zuntz, J; + view all (2016) CMB lensing tomography with the DES Science Verification galaxies. Monthly Notices Of The Royal Astronomical Society , 456 (3) pp. 3213-3244. 10.1093/mnras/stv2678. Green open access

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Abstract

We measure the cross-correlation between the galaxy density in the Dark Energy Survey (DES) Science Verification data and the lensing of the cosmic microwave background (CMB) as reconstructed with the Planck satellite and the South Pole Telescope (SPT). When using the DES main galaxy sample over the full redshift range 0.2 < zphot < 1.2, a cross-correlation signal is detected at 6σ and 4σ with SPT and Planck , respectively. We then divide the DES galaxies into five photometric redshift bins, finding significant (>2σ) detections in all bins. Comparing to the fiducial Planck cosmology, we find the redshift evolution of the signal matches expectations, although the amplitude is consistently lower than predicted across redshift bins. We test for possible systematics that could affect our result and find no evidence for significant contamination. Finally, we demonstrate how these measurements can be used to constrain the growth of structure across cosmic time. We find the data are fit by a model in which the amplitude of structure in the z < 1.2 universe is 0.73 ± 0.16 times as large as predicted in the Λ cold dark matter Planck cosmology, a 1.7σ deviation.

Type: Article
Title: CMB lensing tomography with the DES Science Verification galaxies
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stv2678
Publisher version: http://dx.doi.org/10.1093/mnras/stv2678
Language: English
Additional information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. Copyright © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society
Keywords: cosmic background radiation, gravitational lensing: weak, 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/1478431
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