PACT

II. Pressure profiles of galaxy clusters using Planck and ACT

¹ IRAP, Université de Toulouse, CNRS, CNES, UPS, Toulouse, France
e-mail: etienne.pointecouteau@irap.omp.eu
² Departamento de Astronomía, DCNE, Universidad de Guanajuato, 36023 Guanajuato, Gto., Mexico
³ Université Paris-Saclay, CNRS, Institut d’astrophysique spatiale, Bâtiment 121, 91405 Orsay, France
⁴ Institute for Particle Physics and Astrophysics, Eidgenössische Technische Hochschule Zürich, Wolfgang-Pauli-Str. 27 8093 Zürich, Switzerland
⁵ Instituto de Física de Cantabria (CSIC-UC), Avda. Los Castros s/n, 39005 Santander, Spain
⁶ Centro de Estudios de Física del Cosmos de Aragñn (CEFCA), Plaza de San Juan, 1, Planta 2, 44001 Teruel, Spain
⁷ LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, 53 Av. des Martyrs, 38026 Grenoble, France
⁸ Dept. of Physics and Astronomy, Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218, USA
⁹ Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK

Received: 22 December 2020
Accepted: 10 May 2021

Abstract

The pressure of hot gas in groups and clusters of galaxies is a key physical quantity, which is directly linked to the total mass of the halo and several other thermodynamical properties. In the wake of previous observational works on the hot gas pressure distribution in massive halos, we have investigated a sample of 31 clusters detected in both the Planck and Atacama Cosmology Telescope (ACT), MBAC surveys. We made use of an optimised Sunyaev-Zeldovich (SZ) map reconstructed from the two data sets and tailored for the detection of the SZ effect, taking advantage of both Planck coverage of large scales and the ACT higher spatial resolution. Our average pressure profile covers a radial range going from 0.04 × R₅₀₀ in the central parts to 2.5 × R₅₀₀ in the outskirts. In this way, it improves upon previous pressure-profile reconstruction based on SZ measurements. It is compatible, as well as competitive, with constraints derived from joint X-ray and SZ analysis. This work demonstrates the possibilities offered by large sky surveys of the SZ effect with multiple experiments with different spatial resolutions and spectral coverages, such as ACT and Planck.