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Weak-lensing mass c...
Weak-lensing mass calibration of the Sunyaev-Zel'dovich effect using APEX-SZ galaxy clusters
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- Nagarajan, A. (author)
- Universität zu Köln,University of Cologne,Universität Bonn,University of Bonn
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- Pacaud, F. (author)
- Universität Bonn,University of Bonn
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- Sommer, M. (author)
- Universität Bonn,University of Bonn
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- Klein, M. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),Ludwig-Maximilians-Universität München,Ludwig Maximilian University of Munich
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- Basu, K. (author)
- Universität Bonn,University of Bonn
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- Bertoldi, F. (author)
- Universität Bonn,University of Bonn
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- Lee, A. T. (author)
- University of California at Berkeley,Lawrence Berkeley National Laboratory
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- Ade, P. A. R. (author)
- Cardiff University
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- Bender, A. N. (author)
- University of Colorado at Boulder,McGill University
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- Ferrusca, D. (author)
- Instituto Nacional de Astrofísica, Óptica y Electrońica (INAOE),National Institute of Astrophysics, Optics and Electronics (INAOE)
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- Halverson, N. W. (author)
- University of Colorado at Boulder
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- Horellou, Cathy, 1967 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Johnson, B. R. (author)
- Columbia University in the City of New York
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- Kennedy, J. (author)
- McGill University
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- Kneissl, R. (author)
- Atacama Large Millimeter-submillimeter Array (ALMA),European Southern Observatory Santiago
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- Menten, K. M. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Reichardt, C. L. (author)
- University of Melbourne
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- Tucker, C. (author)
- Cardiff University
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- Westbrook, B. (author)
- University of California at Berkeley
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(creator_code:org_t)
- 2018-07-19
- 2019
- English.
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In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 488:2, s. 1728-1759
- Related links:
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Abstract
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- The use of galaxy clusters as precision cosmological probes relies on an accurate determination of their masses. However, inferring the relationship between cluster mass and observables from direct observations is difficult and prone to sample selection biases. In this work, we use weak lensing as the best possible proxy for cluster mass to calibrate the Sunyaev-Zel'dovich (SZ) effect measurements from the APEX-SZ experiment. For a well-defined (ROSAT) X-ray complete cluster sample, we calibrate the integrated Comptonization parameter, Y-SZ, to the weak-lensing derived total cluster mass, M-500. We employ a novel Bayesian approach to account for the selection effects by jointly fitting both the SZ Comptonization, Y-SZ-M-500, and the X-ray luminosity, Lx-M-500, scaling relations. We also account for a possible correlation between the intrinsic (lognormal) scatter of L-x and Y-SZ at fixed mass. We find the corresponding correlation coefficient to be r = 0.47(-0.35)(+0.24), and at the current precision level our constraints on the scaling relations are consistent with previous works. For our APEX-SZ sample, we find that ignoring the covariance between the SZ and X-ray observables biases the normalization of the Y-SZ-M-500 scaling high by 1-2 sigma and the slope low by similar to 1 sigma, even when the SZ effect plays no role in the sample selection. We conclude that for higher precision data and larger cluster samples, as anticipated from on-going and near-future cluster cosmology experiments, similar biases (due to intrinsic covariances of cluster observables) in the scaling relations will dominate the cosmological error budget if not accounted for correctly.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Matematik -- Sannolikhetsteori och statistik (hsv//swe)
- NATURAL SCIENCES -- Mathematics -- Probability Theory and Statistics (hsv//eng)
Keyword
- galaxies: clusters: general galaxies: clusters: intracluster medium
- cosmology: observations
- methods: statistical
- gravitational lensing: weak
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Nagarajan, A.
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Pacaud, F.
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Sommer, M.
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Klein, M.
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Basu, K.
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Bertoldi, F.
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Lee, A. T.
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Ade, P. A. R.
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Bender, A. N.
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Ferrusca, D.
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Halverson, N. W.
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Horellou, Cathy, ...
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Johnson, B. R.
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Kennedy, J.
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Kneissl, R.
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Menten, K. M.
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Reichardt, C. L.
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Tucker, C.
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Westbrook, B.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Subatomic Physic ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Mathematics
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and Probability Theo ...
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Monthly Notices ...
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Chalmers University of Technology