Nagarajan, A., Pacaud, F., Sommer, M., Klein, M., Basu, K., Bertoldi, F., Lee, A. T., Ade, P. A. R., Bender, A. N., Ferrusca, D., Halverson, N. W., Horellou, C., Johnson, B. R., Kennedy, J., Kneissl, R., Menten, K. M., Reichardt, C. L., Tucker, C. and Westbrook, B. (2019). Weak-lensing mass calibration of the Sunyaev-Zel'dovich effect using APEX-SZ galaxy clusters. Mon. Not. Roy. Astron. Soc., 488 (2). S. 1728 - 1760. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Nagarajan, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pacaud, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sommer, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Klein, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Basu, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bertoldi, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lee, A. T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ade, P. A. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bender, A. N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ferrusca, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Halverson, N. W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Horellou, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Johnson, B. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kennedy, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kneissl, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Menten, K. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Reichardt, C. L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tucker, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Westbrook, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-143428
DOI: 10.1093/mnras/sty1904
Journal or Publication Title: Mon. Not. Roy. Astron. Soc.
Volume: 488
Number: 2
Page Range: S. 1728 - 1760
Date: 2019
Publisher: OXFORD UNIV PRESS
Place of Publication: OXFORD
ISSN: 1365-2966
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
X-RAY-PROPERTIES; SCALING RELATIONS; RELATIVISTIC CORRECTIONS; COMPLETE SAMPLE; COSMOLOGY; COMALIT; II.; SIMULATIONS; EVOLUTION; GIANTSMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/14342

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