26–30 juin 2023
LPSC Grenoble
Fuseau horaire Europe/Paris

Detection of Thermal SZ -- CMB Lensing Cross-Correlation in Planck Legacy Data

26 juin 2023, 14:30
30m
Amphitheatre (LPSC Grenoble)

Amphitheatre

LPSC Grenoble

Orateur

Colin Hill (Columbia University)

Description

We report a high-precision detection of the cross-correlation of the thermal Sunyaev-Zel'dovich (tSZ) effect and gravitational lensing of the cosmic microwave background (CMB) using data from the Planck 2018 legacy release. This is only the second reported detection of this cross-correlation to date, following early work using the Planck nominal mission data (Hill & Spergel 2014). In our analysis, we first construct component-separated tSZ maps from Planck data using a custom needlet internal linear combination (NILC) pipeline. We then cross-correlate our tSZ maps with publicly available Planck CMB lensing maps. We implement a novel moment-based approach to mitigate cosmic infrared background (CIB) contamination in our NILC tSZ maps. We validate our full analysis pipeline using detailed mm-wave sky simulations from the WebSky suite. We interpret our measurement of the tSZ -- CMB lensing cross-correlation using halo model calculations. We derive constraints on cosmological parameters (S8, Ωm) and on parameters describing gas physics in the intracluster medium (ICM), for which our measurement probes the poorly explored regime of low-mass, high-redshift groups and clusters.

Auteurs principaux

Colin Hill (Columbia University) Fiona McCarthy (Flatiron Institute)

Documents de présentation