Measurement of Galaxy Cluster Integrated Comptonization and Mass Scaling Relations with the South Pole Telescope
In this work we describe a method for measuring the integrated Comptonization ($Y_{SZ}$) of clusters of galaxies from measurements of the Sunyaev–Zel'dovich (SZ) effect in multiple frequency bands and use this method to characterize a sample of galaxy clusters detected in the South Pole Telesco...
Published in: | The Astrophysical Journal |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Language: | unknown |
Published: |
2023
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Subjects: | |
Online Access: | http://www.osti.gov/servlets/purl/1331797 https://www.osti.gov/biblio/1331797 https://doi.org/10.1088/0004-637x/799/2/137 |
Summary: | In this work we describe a method for measuring the integrated Comptonization ($Y_{SZ}$) of clusters of galaxies from measurements of the Sunyaev–Zel'dovich (SZ) effect in multiple frequency bands and use this method to characterize a sample of galaxy clusters detected in the South Pole Telescope (SPT) data. We use a Markov Chain Monte Carlo method to fit a β-model source profile and integrate $Y_{SZ}$ within an angular aperture on the sky. In simulated observations of an SPT-like survey that include cosmic microwave background anisotropy, point sources, and atmospheric and instrumental noise at typical SPT-SZ survey levels, we show that we can accurately recover β-model parameters for inputted clusters. We measure $Y_{SZ}$ for simulated semi-analytic clusters and find that $Y_{SZ}$ is most accurately determined in an angular aperture comparable to the SPT beam size. We demonstrate the utility of this method to measure $Y_{SZ}$ and to constrain mass scaling relations using X-ray mass estimates for a sample of 18 galaxy clusters from the SPT-SZ survey. Measuring $Y_{SZ}$ within a 0farcm75 radius aperture, we find an intrinsic log-normal scatter of 21% ± 11% in $Y_{SZ}$ at a fixed mass. Measuring $Y_{SZ}$ within a 0.3 Mpc projected radius (equivalent to 0farcm75 at the survey median redshift z = 0.6), we find a scatter of 26% ± 9%. Prior to this study, the SPT observable found to have the lowest scatter with mass was cluster detection significance. We demonstrate, from both simulations and SPT observed clusters that $Y_{SZ}$ measured within an aperture comparable to the SPT beam size is equivalent, in terms of scatter with cluster mass, to SPT cluster detection significance. |
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