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. Tröster; 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. Tröster, J. L. van den Busch

School of Physics and Astronomy

Research output: Contribution to journal › Letter › 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 0:8δ reduction in the DES-inferred value for S8, which decreases to a 0:5δ reduction when including asystematic redshift calibration error model from mock DES data based on the MICE2 simulation. The combined KV450 + DES-Y1 constraint on S 8 = 0:762+0:025-0:024 is in tension with the Planck 2018 constraint from the cosmic microwave background at the level of 2:5δ. 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
Early online date	29 May 2020
DOIs	https://doi.org/10.1051/0004-6361/201936154
Publication status	Published - 1 Jun 2020

Keywords

astro-ph.CO

Access to Document

10.1051/0004-6361/201936154

1906.09262Accepted author manuscript, 535 KB

https://arxiv.org/abs/1906.09262

GLOBE: Global Lensing Observations to go Beyond Einstein (027451/1)
Heymans, C.
EU government bodies
1/11/15 → 31/10/21
Project: Research

Cite this

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., Tröster, T., & Busch, J. L. V. D. (2020). KiDS+VIKING-450 and DES-Y1 combined: Cosmology with cosmic shear. Astronomy and Astrophysics, 638, [L1]. https://doi.org/10.1051/0004-6361/201936154

@article{fa9deed4883248d3931846b1f30585d7,

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 0:8δ reduction in the DES-inferred value for S8, which decreases to a 0:5δ reduction when including asystematic redshift calibration error model from mock DES data based on the MICE2 simulation. The combined KV450 + DES-Y1 constraint on S 8 = 0:762+0:025-0:024 is in tension with the Planck 2018 constraint from the cosmic microwave background at the level of 2:5δ. This result highlights the importance of developing methods to provide accurate redshift calibration for current and future weak lensing surveys.",

keywords = "astro-ph.CO",

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. Tr{\"o}ster and Busch, {J. L. van den}",

note = "8 pages, 4 figures, new appendix added including a simulated analysis, version accepted for publication by A&A Letters, chains can be found at https://github.com/sjoudaki/kidsdes",

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",

}

TY - JOUR

T1 - KiDS+VIKING-450 and DES-Y1 combined

T2 - 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 - Tröster, T.

AU - Busch, J. L. van den

N1 - 8 pages, 4 figures, new appendix added including a simulated analysis, version accepted for publication by A&A Letters, chains can be found at https://github.com/sjoudaki/kidsdes

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 0:8δ reduction in the DES-inferred value for S8, which decreases to a 0:5δ reduction when including asystematic redshift calibration error model from mock DES data based on the MICE2 simulation. The combined KV450 + DES-Y1 constraint on S 8 = 0:762+0:025-0:024 is in tension with the Planck 2018 constraint from the cosmic microwave background at the level of 2:5δ. 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 0:8δ reduction in the DES-inferred value for S8, which decreases to a 0:5δ reduction when including asystematic redshift calibration error model from mock DES data based on the MICE2 simulation. The combined KV450 + DES-Y1 constraint on S 8 = 0:762+0:025-0:024 is in tension with the Planck 2018 constraint from the cosmic microwave background at the level of 2:5δ. This result highlights the importance of developing methods to provide accurate redshift calibration for current and future weak lensing surveys.

KW - astro-ph.CO

U2 - 10.1051/0004-6361/201936154

DO - 10.1051/0004-6361/201936154

M3 - Letter

VL - 638

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

M1 - L1

ER -

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

Abstract

Keywords

Access to Document

Fingerprint

Projects

GLOBE: Global Lensing Observations to go Beyond Einstein (027451/1)

Cite this