Universität zu Köln

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:	Creators Email ORCID ORCID Put Code Nagarajan, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pacaud, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sommer, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Klein, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Basu, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bertoldi, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lee, A. T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ade, P. A. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bender, A. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ferrusca, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Halverson, N. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Horellou, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Johnson, B. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kennedy, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kneissl, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Menten, K. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Reichardt, C. L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tucker, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Westbrook, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED
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:	Keywords Language X-RAY-PROPERTIES; SCALING RELATIONS; RELATIVISTIC CORRECTIONS; COMPLETE SAMPLE; COSMOLOGY; COMALIT; II.; SIMULATIONS; EVOLUTION; GIANTS Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14342