A measurement of CMB cluster lensing with SPT and DES year 1 data

Baxter, E J and Desai, Shantanu and al, et (2018) A measurement of CMB cluster lensing with SPT and DES year 1 data. Monthly Notices of the Royal Astronomical Society, 476 (2). pp. 2674-2688. ISSN 0035-8711

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Clusters of galaxies gravitationally lens the cosmic microwave background (CMB) radiation, resulting in a distinct imprint in the CMB on arcminute scales. Measurement of this effect offers a promising way to constrain the masses of galaxy clusters, particularly those at high redshift. We use CMB maps from the South Pole Telescope Sunyaev–Zel'dovich (SZ) survey to measure the CMB lensing signal around galaxy clusters identified in optical imaging from first year observations of the Dark Energy Survey. The cluster catalogue used in this analysis contains 3697 members with mean redshift of z¯=0.45⁠. We detect lensing of the CMB by the galaxy clusters at 8.1σ significance. Using the measured lensing signal, we constrain the amplitude of the relation between cluster mass and optical richness to roughly 17percent precision, finding good agreement with recent constraints obtained with galaxy lensing. The error budget is dominated by statistical noise but includes significant contributions from systematic biases due to the thermal SZ effect and cluster miscentring.

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IITH Creators:
IITH CreatorsORCiD
Desai, Shantanuhttp://orcid.org/0000-0002-0466-3288
Item Type: Article
Uncontrolled Keywords: gravitational lensing: weak, galaxies: clusters: general, cosmic background radiation
Subjects: Physics
Divisions: Department of Physics
Depositing User: Library Staff
Date Deposited: 16 Jan 2019 05:19
Last Modified: 16 Jan 2019 05:19
URI: http://raiith.iith.ac.in/id/eprint/4714
Publisher URL: http://dx.doi.org/10.1093/mnras/sty305
OA policy: http://www.sherpa.ac.uk/romeo/issn/0035-8711/
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