The DECADE cosmic shear project IV: cosmological constraints from 107 million galaxies across 5,400 deg <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"> <a:msup> <a:mi/> <a:mn>2</a:mn> </a:msup> </a:math> of the sky

We present cosmological constraints from the Dark Energy Camera All Data Everywhere (DECADE) cosmic shear analysis. This work uses shape measurements for 107 million galaxies measured through Dark Energy Camera (DECam) imaging of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mn>5</mml:mn> <mml:mo>,</mml:mo> <mml:mspace width="-0.167em"/> <mml:mn>412</mml:mn> </mml:mrow> </mml:math> deg <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mi/> <mml:mn>2</mml:mn> </mml:msup> </mml:math> of sky that is outside the Dark Energy Survey (DES) footprint. We derive constraints on the cosmological parameters <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:msub> <mml:mi>S</mml:mi> <mml:mn>8</mml:mn> </mml:msub> <mml:mo>=</mml:mo> <mml:msubsup> <mml:mn>0.791</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.032</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.027</mml:mn> </mml:mrow> </mml:msubsup> </mml:mrow> </mml:math> and for the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mi>Λ</mml:mi> </mml:math> CDM model, which are consistent with those from other weak lensing surveys and from the cosmic microwave background. We combine our results with cosmic shear results from DES Y3 at the likelihood level, since the two datasets span independent areas on the sky. The combined measurements, which cover <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mo>≈</mml:mo> <mml:mspace width="-0.167em"/> <mml:mn>10</mml:mn> <mml:mo>,</mml:mo> <mml:mspace width="-0.167em"/> <mml:mn>000</mml:mn> </mml:mrow> </mml:math> deg <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mi/> <mml:mn>2</mml:mn> </mml:msup> </mml:math> , prefer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:msub> <mml:mi>S</mml:mi> <mml:mn>8</mml:mn> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>0.791</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.023</mml:mn> </mml:mrow> </mml:math> and under the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mi>Λ</mml:mi> </mml:math> CDM model. These results are the culmination of a series of rigorous studies that characterize and validate the DECADE dataset and the associated analysis methodologies (Anbajagane et. al 2025a,b,c). Overall, the DECADE project demonstrates that the cosmic shear analysis methods employed in Stage-III weak lensing surveys can provide robust cosmological constraints for fairly inhomogeneous datasets. This opens the possibility of using data that have been previously categorized as ``unusable’’ for cosmic shear analyses, thereby increasing the statistical power of upcoming weak lensing surveys.

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Publication Details

Journal
The Open Journal of Astrophysics
Published
2025-10-22
DOI
https://doi.org/10.33232/001c.146161
Citations
3
Primary Topic
Astronomy and Astrophysical Research
Type
article
Field-Weighted Citation Impact
3.58
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article

The DECADE cosmic shear project IV: cosmological constraints from 107 million galaxies across 5,400 deg <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"> <a:msup> <a:mi/> <a:mn>2</a:mn> </a:msup> </a:math> of the sky

T. Shin, J. Blazek, L. F. Secco, D. J. James et al.
3 citations
The Open Journal of Astrophysics
Astronomy and Astrophysical Research
3.58
article

The DECADE cosmic shear project IV: cosmological constraints from 107 million galaxies across 5,400 deg <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"> <a:msup> <a:mi/> <a:mn>2</a:mn> </a:msup> </a:math> of the sky

T. Shin, J. Blazek, L. F. Secco, D. J. James, J. Prat, Katherine Herron, K. Herner, J. Myles, G. E. Medina, A. K. Vivas, H. Camacho, S Dodelson, M. Adamów, M. R. Becker, G. Giannini, Chin Yi Tan, D. Gruen, W. Cerny, Y. Zhang, C. E. Martínez-Vázquez, J. Esteves, S. Mau, Guy S. Stringfellow, A. Amon, A. Porredon, A Navarro-Alsina, Eric Huff, Alexander H. Riley, J. Zuntz, Pol Massana, C. Chang, Rayane Brinck Teixeira, E. S. Rykoff, J. A. Carballo-Bello, Nathalie Chicoine, N. Kuropatkin, A. Choi, F. Andrade-Oliveira, Andrew B. Pace, J. McCullough, Burçı̇n Mutlu-Pakdı̇l, A. Carnero Rosell, S. Samuroff, P. S. Ferguson, C. R. Bom, Marco Raveri, Amy S. K. Tong, J. D. Sakowska, M. Navabi, C. To, K. Eckert, D. J. Suson, Dhayaa Anbajagane, Mike Jarvis, A. Drlica-Wagner, Noelia E. D. Noël, L. Santana-Silva, E. Krause, A. Alarcon, C. Doux, R. Cawthon, I. Sevilla-Noarbe, J. Elvin-Poole, Z. Zhang, Young‐Jun Choi, M. Yamamoto, M. A. Troxel, B Yanny, W. G. Hartley, M. Soares-Santos, B. Yin, M. Gatti, D. J. Sand, R. A. Gruendl, D. Sanchez-Cid
article en
3 citations

Abstract

We present cosmological constraints from the Dark Energy Camera All Data Everywhere (DECADE) cosmic shear analysis. This work uses shape measurements for 107 million galaxies measured through Dark Energy Camera (DECam) imaging of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mn>5</mml:mn> <mml:mo>,</mml:mo> <mml:mspace width="-0.167em"/> <mml:mn>412</mml:mn> </mml:mrow> </mml:math> deg <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mi/> <mml:mn>2</mml:mn> </mml:msup> </mml:math> of sky that is outside the Dark Energy Survey (DES) footprint. We derive constraints on the cosmological parameters <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:msub> <mml:mi>S</mml:mi> <mml:mn>8</mml:mn> </mml:msub> <mml:mo>=</mml:mo> <mml:msubsup> <mml:mn>0.791</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.032</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.027</mml:mn> </mml:mrow> </mml:msubsup> </mml:mrow> </mml:math> and for the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mi>Λ</mml:mi> </mml:math> CDM model, which are consistent with those from other weak lensing surveys and from the cosmic microwave background. We combine our results with cosmic shear results from DES Y3 at the likelihood level, since the two datasets span independent areas on the sky. The combined measurements, which cover <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mo>≈</mml:mo> <mml:mspace width="-0.167em"/> <mml:mn>10</mml:mn> <mml:mo>,</mml:mo> <mml:mspace width="-0.167em"/> <mml:mn>000</mml:mn> </mml:mrow> </mml:math> deg <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mi/> <mml:mn>2</mml:mn> </mml:msup> </mml:math> , prefer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:msub> <mml:mi>S</mml:mi> <mml:mn>8</mml:mn> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>0.791</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.023</mml:mn> </mml:mrow> </mml:math> and under the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mi>Λ</mml:mi> </mml:math> CDM model. These results are the culmination of a series of rigorous studies that characterize and validate the DECADE dataset and the associated analysis methodologies (Anbajagane et. al 2025a,b,c). Overall, the DECADE project demonstrates that the cosmic shear analysis methods employed in Stage-III weak lensing surveys can provide robust cosmological constraints for fairly inhomogeneous datasets. This opens the possibility of using data that have been previously categorized as ``unusable’’ for cosmic shear analyses, thereby increasing the statistical power of upcoming weak lensing surveys.

The Open Journal of AstrophysicsVol. 8
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Astronomy and Astrophysical Research
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