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.
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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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