The University of Southampton
University of Southampton Institutional Repository

Survey geometry and the internal consistency of recent cosmic shear measurements

Survey geometry and the internal consistency of recent cosmic shear measurements
Survey geometry and the internal consistency of recent cosmic shear measurements

We explore the impact of an update to the typical approximation for the shape noise term in the analytic covariance matrix for cosmic shear experiments that assumes the absence of survey boundary and mask effects. We present an exact expression for the number of galaxy pairs in this term based on the survey mask, which leads to more than a factor of three increase in the shape noise on the largest measured scales for the Kilo-Degree Survey (KiDS-450) real-space cosmic shear data. We compare the result of this analytic expression to several alternative methods for measuring the shape noise from the data and find excellent agreement. This update to the covariance resolves any internal model tension evidenced by the previously large cosmological best-fitting Χ2 for the KiDS-450 cosmic shear data. The best-fitting Χ2 is reduced from 161 to 121 for 118 degrees of freedom. We also apply a correction to how the multiplicative shear calibration uncertainty is included in the covariance. This change shifts the inferred amplitude of the correlation function to higher values. We find that this improves agreement of the KiDS-450 cosmic shear results with Dark Energy Survey Year 1 and Planck results.

Gravitational lensing: weak, Methods: data analysis, Methods: statistical
0035-8711
4998-5004
Troxel, M.A.
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Krause, E.
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Chang, C.
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Friedrich, O.
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MacCrann, N.
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Chen, A.
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Davis, C.
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DeRose, J.
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Hoyle, B.
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Troxel, M.A., Krause, E., Chang, C., Eifler, T.F., Friedrich, O., Gruen, D., MacCrann, N., Chen, A., Davis, C., DeRose, J., Dodelson, S., Gatti, M., Hoyle, B., Huterer, D., Jarvis, M., Lacasa, F., Lemos, P., Peiris, H.V., Prat, J., Samuroff, S., Sánchez, C., Sheldon, E., Vielzeuf, P., Wang, M., Zuntz, J., Lahav, O., Abdalla, F.B., Allam, S., Annis, J., Avila, S., Bertin, E., Brooks, D., Burke, D.L., Carnero Rosell, A., Carrasco Kind, M., Carretero, J., Crocce, M., Cunha, C.E., D'Andrea, C.B., Da Costa, L.N., De Vicente, J., Diehl, H.T., Doel, P., Evrard, A.E., Flaugher, B., Fosalba, P., Frieman, J., García-Bellido, J., Gaztanaga, E., Gerdes, D.W., Gruendl, R.A., Gschwend, J., Gutierrez, G., Hartley, W.G., Hollowood, D.L., Honscheid, K., James, D.J., Kirk, D., Kuehn, K., Kuropatkin, N., Li, T.S., Lima, M., March, M., Menanteau, F., Miquel, R., Mohr, J.J., Ogando, R.L.C., Plazas, A.A., Roodman, A., Sanchez, E., Scarpine, V., Schindler, R., Sevilla-Noarbe, I., Smith, M., Soares-Santos, M., Sobreira, F., Suchyta, E., Swanson, M.E.C., Thomas, D., Walker, A.R. and Wechsler, R.H. (2018) Survey geometry and the internal consistency of recent cosmic shear measurements. Monthly Notices of the Royal Astronomical Society, 479 (4), 4998-5004. (doi:10.1093/mnras/sty1889).

Record type: Article

Abstract

We explore the impact of an update to the typical approximation for the shape noise term in the analytic covariance matrix for cosmic shear experiments that assumes the absence of survey boundary and mask effects. We present an exact expression for the number of galaxy pairs in this term based on the survey mask, which leads to more than a factor of three increase in the shape noise on the largest measured scales for the Kilo-Degree Survey (KiDS-450) real-space cosmic shear data. We compare the result of this analytic expression to several alternative methods for measuring the shape noise from the data and find excellent agreement. This update to the covariance resolves any internal model tension evidenced by the previously large cosmological best-fitting Χ2 for the KiDS-450 cosmic shear data. The best-fitting Χ2 is reduced from 161 to 121 for 118 degrees of freedom. We also apply a correction to how the multiplicative shear calibration uncertainty is included in the covariance. This change shifts the inferred amplitude of the correlation function to higher values. We find that this improves agreement of the KiDS-450 cosmic shear results with Dark Energy Survey Year 1 and Planck results.

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Accepted/In Press date: 11 June 2018
e-pub ahead of print date: 15 June 2018
Published date: 1 October 2018
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Owner Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Keywords: Gravitational lensing: weak, Methods: data analysis, Methods: statistical

Identifiers

Local EPrints ID: 423348
URI: https://eprints.soton.ac.uk/id/eprint/423348
ISSN: 0035-8711
PURE UUID: fe3b54b3-1425-446a-a83a-be1be5c98559
ORCID for M. Smith: ORCID iD orcid.org/0000-0002-3321-1432

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Date deposited: 20 Sep 2018 16:30
Last modified: 17 May 2019 00:30

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Contributors

Author: M.A. Troxel
Author: E. Krause
Author: C. Chang
Author: T.F. Eifler
Author: O. Friedrich
Author: D. Gruen
Author: N. MacCrann
Author: A. Chen
Author: C. Davis
Author: J. DeRose
Author: S. Dodelson
Author: M. Gatti
Author: B. Hoyle
Author: D. Huterer
Author: M. Jarvis
Author: F. Lacasa
Author: P. Lemos
Author: H.V. Peiris
Author: J. Prat
Author: S. Samuroff
Author: C. Sánchez
Author: E. Sheldon
Author: P. Vielzeuf
Author: M. Wang
Author: J. Zuntz
Author: O. Lahav
Author: F.B. Abdalla
Author: S. Allam
Author: J. Annis
Author: S. Avila
Author: E. Bertin
Author: D. Brooks
Author: D.L. Burke
Author: A. Carnero Rosell
Author: M. Carrasco Kind
Author: J. Carretero
Author: M. Crocce
Author: C.E. Cunha
Author: C.B. D'Andrea
Author: L.N. Da Costa
Author: J. De Vicente
Author: H.T. Diehl
Author: P. Doel
Author: A.E. Evrard
Author: B. Flaugher
Author: P. Fosalba
Author: J. Frieman
Author: J. García-Bellido
Author: E. Gaztanaga
Author: D.W. Gerdes
Author: R.A. Gruendl
Author: J. Gschwend
Author: G. Gutierrez
Author: W.G. Hartley
Author: D.L. Hollowood
Author: K. Honscheid
Author: D.J. James
Author: D. Kirk
Author: K. Kuehn
Author: N. Kuropatkin
Author: T.S. Li
Author: M. Lima
Author: M. March
Author: F. Menanteau
Author: R. Miquel
Author: J.J. Mohr
Author: R.L.C. Ogando
Author: A.A. Plazas
Author: A. Roodman
Author: E. Sanchez
Author: V. Scarpine
Author: R. Schindler
Author: I. Sevilla-Noarbe
Author: M. Smith ORCID iD
Author: M. Soares-Santos
Author: F. Sobreira
Author: E. Suchyta
Author: M.E.C. Swanson
Author: D. Thomas
Author: A.R. Walker
Author: R.H. Wechsler

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