KiDS+VIKING-450 and DES-Y1 combined: Cosmology with cosmic shear

S. Joudaki; H. Hildebrandt; D. Traykova; N. E. Chisari; C. Heymans; A. Kannawadi; K. Kuijken; A. H. Wright; M. Asgari; T. Erben; H. Hoekstra; B. Joachimi; L. Miller; T. Troster; J. L. van den Busch

doi:10.1051/0004-6361/201936154

KiDS+VIKING-450 and DES-Y1 combined: Cosmology with cosmic shear

S. Joudaki^*, H. Hildebrandt, D. Traykova, N. E. Chisari, C. Heymans, A. Kannawadi, K. Kuijken, A. H. Wright, M. Asgari, T. Erben, H. Hoekstra, B. Joachimi, L. Miller, T. Troster, J. L. van den Busch

^*Corresponding author for this work

Theoretical Physics

Research output: Contribution to journal › Comment/Letter to the editor › Academic › peer-review

Abstract

We present a combined tomographic weak gravitational lensing analysis of the Kilo Degree Survey (KV450) and the Dark Energy Survey (DES-Y1). We homogenize the analysis of these two public cosmic shear datasets by adopting consistent priors and modeling of nonlinear scales, and determine new redshift distributions for DES-Y1 based on deep public spectroscopic surveys. Adopting these revised redshifts results in a 0.8σ reduction in the DES-inferred value for S8, which decreases to a 0.5σ reduction when including a systematic redshift calibration error model from mock DES data based on the MICE2 simulation. The combined KV450+DES-Y1 constraint on S8 = 0.762−0.024+0.025 is in tension with the Planck 2018 constraint from the cosmic microwave background at the level of 2.5σ. This result highlights the importance of developing methods to provide accurate redshift calibration for current and future weak-lensing surveys.

Original language	English
Article number	L1
Number of pages	8
Journal	Astronomy and Astrophysics
Volume	638
DOIs	https://doi.org/10.1051/0004-6361/201936154
Publication status	Published - 1 Jun 2020

Keywords

cosmology: observations
galaxies: photometry
gravitational lensing: weak
surveys

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aa36154-19Final published version, 705 KBLicence: Taverne

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Joudaki, S., Hildebrandt, H., Traykova, D., Chisari, N. E., Heymans, C., Kannawadi, A., Kuijken, K., Wright, A. H., Asgari, M., Erben, T., Hoekstra, H., Joachimi, B., Miller, L., Troster, T., & van den Busch, J. L. (2020). KiDS+VIKING-450 and DES-Y1 combined: Cosmology with cosmic shear. Astronomy and Astrophysics, 638, Article L1. https://doi.org/10.1051/0004-6361/201936154

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title = "KiDS+VIKING-450 and DES-Y1 combined: Cosmology with cosmic shear",

abstract = "We present a combined tomographic weak gravitational lensing analysis of the Kilo Degree Survey (KV450) and the Dark Energy Survey (DES-Y1). We homogenize the analysis of these two public cosmic shear datasets by adopting consistent priors and modeling of nonlinear scales, and determine new redshift distributions for DES-Y1 based on deep public spectroscopic surveys. Adopting these revised redshifts results in a 0.8σ reduction in the DES-inferred value for S8, which decreases to a 0.5σ reduction when including a systematic redshift calibration error model from mock DES data based on the MICE2 simulation. The combined KV450+DES-Y1 constraint on S8 = 0.762−0.024+0.025 is in tension with the Planck 2018 constraint from the cosmic microwave background at the level of 2.5σ. This result highlights the importance of developing methods to provide accurate redshift calibration for current and future weak-lensing surveys.",

keywords = "cosmology: observations, galaxies: photometry, gravitational lensing: weak, surveys",

author = "S. Joudaki and H. Hildebrandt and D. Traykova and Chisari, {N. E.} and C. Heymans and A. Kannawadi and K. Kuijken and Wright, {A. H.} and M. Asgari and T. Erben and H. Hoekstra and B. Joachimi and L. Miller and T. Troster and {van den Busch}, {J. L.}",

year = "2020",

month = jun,

day = "1",

doi = "10.1051/0004-6361/201936154",

language = "English",

volume = "638",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

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TY - JOUR

T1 - KiDS+VIKING-450 and DES-Y1 combined: Cosmology with cosmic shear

AU - Joudaki, S.

AU - Hildebrandt, H.

AU - Traykova, D.

AU - Chisari, N. E.

AU - Heymans, C.

AU - Kannawadi, A.

AU - Kuijken, K.

AU - Wright, A. H.

AU - Asgari, M.

AU - Erben, T.

AU - Hoekstra, H.

AU - Joachimi, B.

AU - Miller, L.

AU - Troster, T.

AU - van den Busch, J. L.

PY - 2020/6/1

Y1 - 2020/6/1

N2 - We present a combined tomographic weak gravitational lensing analysis of the Kilo Degree Survey (KV450) and the Dark Energy Survey (DES-Y1). We homogenize the analysis of these two public cosmic shear datasets by adopting consistent priors and modeling of nonlinear scales, and determine new redshift distributions for DES-Y1 based on deep public spectroscopic surveys. Adopting these revised redshifts results in a 0.8σ reduction in the DES-inferred value for S8, which decreases to a 0.5σ reduction when including a systematic redshift calibration error model from mock DES data based on the MICE2 simulation. The combined KV450+DES-Y1 constraint on S8 = 0.762−0.024+0.025 is in tension with the Planck 2018 constraint from the cosmic microwave background at the level of 2.5σ. This result highlights the importance of developing methods to provide accurate redshift calibration for current and future weak-lensing surveys.

AB - We present a combined tomographic weak gravitational lensing analysis of the Kilo Degree Survey (KV450) and the Dark Energy Survey (DES-Y1). We homogenize the analysis of these two public cosmic shear datasets by adopting consistent priors and modeling of nonlinear scales, and determine new redshift distributions for DES-Y1 based on deep public spectroscopic surveys. Adopting these revised redshifts results in a 0.8σ reduction in the DES-inferred value for S8, which decreases to a 0.5σ reduction when including a systematic redshift calibration error model from mock DES data based on the MICE2 simulation. The combined KV450+DES-Y1 constraint on S8 = 0.762−0.024+0.025 is in tension with the Planck 2018 constraint from the cosmic microwave background at the level of 2.5σ. This result highlights the importance of developing methods to provide accurate redshift calibration for current and future weak-lensing surveys.

KW - cosmology: observations

KW - galaxies: photometry

KW - gravitational lensing: weak

KW - surveys

U2 - 10.1051/0004-6361/201936154

DO - 10.1051/0004-6361/201936154

M3 - Comment/Letter to the editor

SN - 0004-6361

VL - 638

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - L1

ER -

KiDS+VIKING-450 and DES-Y1 combined: Cosmology with cosmic shear

Abstract

Keywords

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