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Detection of CMB-Cluster Lensing using Polarization Data from SPTpol

Raghunathan, S; Patil, S; Baxter, E; Benson, BA; Bleem, LE; Crawford, TM; Holder, GP; ... Zhang, Y; + view all (2019) Detection of CMB-Cluster Lensing using Polarization Data from SPTpol. Physical Review Letters , 123 (18) , Article 181301. 10.1103/PhysRevLett.123.181301. Green open access

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Abstract

We report the first detection of gravitational lensing due to galaxy clusters using only the polarization of the cosmic microwave background (CMB). The lensing signal is obtained using a new estimator that extracts the lensing dipole signature from stacked images formed by rotating the cluster-centered Stokes QU map cutouts along the direction of the locally measured background CMB polarization gradient. Using data from the SPTpol 500 deg^{2} survey at the locations of roughly 18 000 clusters with richness lambda ≥ 10 from the Dark Energy Survey (DES) Year-3 full galaxy cluster catalog, we detect lensing at 4.8 sigma. The mean stacked mass of the selected sample is found to be (1.43 ± 0.40) x 10^{14} M_{⊙} which is in good agreement with optical weak lensing based estimates using DES data and CMB-lensing based estimates using SPTpol temperature data. This measurement is a key first step for cluster cosmology with future low-noise CMB surveys, like CMB-S4, for which CMB polarization will be the primary channel for cluster lensing measurements.

Type: Article
Title: Detection of CMB-Cluster Lensing using Polarization Data from SPTpol
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.123.181301
Publisher version: https://doi.org/10.1103/PhysRevLett.123.181301
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Gravitation, Cosmology & Astrophysics, Galaxy clusters, Gravitational lenses
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/10086188
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