Measurement of Galaxy Cluster Integrated Comptonization and Mass Scaling Relations With the South Pole Telescope

• Published in: The Astrophysical Journal
• Main Authors: Saliwanchik, B. R., Montroy, T. E., Aird, K. A., Bayliss, Matthew, Benson, B. A., Bleem, L. E., Bocquet, S., Brodwin, M., Carlstrom, J. E., Chang, C. L., Cho, H. M., Clocchiatti, A., Crawford, T. M., Crites, A. T., de Haan, T., Desai, S., Dobbs, M. A., Dudley, J. P., Foley, R. J., Forman, William R., George, E. M., Gladders, M. D., Gonzalez, A. H., Halverson, N. W., Hlavacek-Larrondo, J., Holder, G. P., Holzapfel, W. L., Hrubes, J. D., Jones, C., Keisler, R., Knox, L., Lee, A. T., Leitch, E. M., Liu, J., Lueker, M., Luong-Van, D., Mantz, A., Marrone, D. P., McDonald, M., McMahon, J. J., Mehl, J., Meyer, S. S., Mocanu, L., Mohr, J. J., Murray, S, Nurgaliev, D, Padin, S., Patej, Anna, Pryke, Clement L., Reichardt, C. L., Rest, A., Ruel, J, Ruhl, J. E., Saro, A., Sayre, J. T., Schaffer, K. K., Shirokoff, E., Spieler, H. G., Stalder, Brian A, Stanford, S. A., Staniszewski, Z., Stark, Antony A., Story, K., Stubbs, Christopher William, Vanderlinde, K., Vieira, J. D., Vikhlinin, Alexey A., Williamson, R., Zahn, O., Zenteno, A.
• Format: Article in Journal/Newspaper
• Language: English
• Published: IOP Publishing 2015
• Subjects: methods: data analysis; galaxies: clusters; X-rays: galaxies: clusters; South Pole; South pole
• Online Access: http://nrs.harvard.edu/urn-3:HUL.InstRepos:32785048; https://doi.org/10.1088/0004-637X/799/2/137

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. Astronomy Physics Accepted Manuscript