DES Year 1 Cosmology Results: Papers

This page serves as the portal for a series of 10 papers on and in support of the DES cosmology results from the first year (Y1) of the survey, which were released on Aug. 3, 2017. For each paper, clicking on ‘Link’ will take you to the arXiv, where the pdfs can be accessed. On Thurs., Aug. 3, 2017, Daniel Gruen delivered a talk on these results at the APS Division of Particles & Fields meeting at Fermilab. A video of this talk as well as the slides can be accessed here, as well as in our Video Gallery, where you can find all our DES videos.

All papers are also listed on the DES Publications page.

All media coverage and press releases can be found on the DES in the News page.

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Constraints on a measure of the clumpiness of the matter distribution (S8) and the fractional density of the Universe in matter (Ωm) from the combined 3 DES Y1 measurements (blue), Planck CMB measurements (green), and their combination (red).

 

Dark Energy Survey Year 1 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing

DES collaboration | Corresponding Author: [email protected] | Link 

This paper combines DES Y1 measurements of galaxy clustering, galaxy-galaxy lensing, and weak lensing cosmic shear to derive constraints on cosmological parameters, compares with measurements from other experiments, and combines with external data to obtain stringent constraints.


 

 

 

 

 

DES Y1 measurement of cosmic shear in 10 pairs of source galaxy redshift bins, using shapes of 26 million galaxies.

 

Dark Energy Survey Year 1 Results: Cosmological Constraints from Cosmic Shear

M. A. Troxel, et al | Corresponding Author: [email protected]  | Link 

This paper presents the most significant detection of weak gravitational lensing cosmic shear in a galaxy survey to date, using shapes of 26 million galaxies in 4 redshift bins, and derives constraints on cosmological parameters therefrom. This is one of the 3 measurements used in “Cosmological Constraints from Galaxy Clustering and Weak Lensing.”


 

DES Y1 measurement of angular clustering of 660,000 red galaxies in 5 redshift bins.

 

Dark Energy Survey Year 1 Results: Galaxy clustering for combined probes

J. Elvin-Poole, et al | Corresponding Author: [email protected] | Link 

This paper presents measurements of the spatial clustering of 660,000 red galaxies in 5 redshift bins and demonstrates robustness of the results against systematic errors. This is one of the 3 measurements used in “Cosmological Constraints from Galaxy Clustering and Weak Lensing.” 

 

 


 

DES Y1 galaxy-galaxy lensing measurement in 5 lens redshift bins, showing results for 4 source galaxy redshift bins in each case.

 

Dark Energy Survey Year 1 Results: Galaxy-Galaxy Lensing

J. Prat, C. Sanchez, et al | Corresponding Authors: [email protected], [email protected] | Link 

This paper presents measurements of the correlation of galaxy shear from 26 million source galaxies (from Zuntz, et al) with the positions of 660,000 red foreground lens galaxies (from Elvin-Poole, et al), due to weak gravitational lensing. This is one of the 3 data sets used in “Cosmological Constraints from Galaxy Clustering and Weak Lensing.” 


 

 

 

Footprint showing galaxy density for the DES Y1 Metacalibration shear catalogue, which contains 34.8 million objects over 1500 square degrees. The outline of the 5000 square degree 5-year DES footprint is shown in blue.

 

Dark Energy Survey Year 1 Results: Weak Lensing Shape Catalogues

J. Zuntz, E. Sheldon, et al | Corresponding Authors: [email protected], [email protected] | Link 

This paper presents galaxy shape catalogues for the DES Y1 weak lensing measurements, using two independent shear measurement pipelines, Metacalibration and im3shape. These measurements are used in the Cosmic Shear analysis (Troxel, et al) and the Galaxy-galaxy lensing analysis (Prat, et al).  

 


 

 

 

Redshift distributions derived from 3 different methods for the 26 million source galaxies used in the DES Y1 weak lensing measurements.

 

Dark Energy Survey Year 1 Results: Redshift distributions of the weak lensing source galaxies

B. Hoyle, D. Gruen, et al | Corresponding Authors: [email protected], [email protected]| Link 

This paper describes the derivation and validation of the distribution of redshifts for the source galaxies used in the DES Y1 weak lensing measurements.


 

 

 

Illustration of the problem of measuring galaxy shapes in images with nearby galaxies in the field: input objects are circular but the inferred shape is elliptical .

 

Dark Energy Survey Year 1 Results: The Impact of Galaxy Neighbours on Weak Lensing Cosmology with IM3SHAPE

S. Samuroff, et al | Corresponding Author: [email protected]| Link 

This paper uses simulated DES Y1 images to explore the impact of neighboring galaxies on galaxy shape measurements with im3shape and thereby on cosmology constraints from weak lensing cosmic shear.  


 

 

 

 

Model correlation matrix for the 3 measurements used in the DES Y1 analysis: cosmic shear, galaxy-galaxy lensing, and galaxy clustering.

 

Dark Energy Survey Year 1 Results: Multi-Probe Methodology and Simulated Likelihood Analyses

E. Krause, T. Eifler, et al | Corresponding Authors: [email protected], [email protected]| Link 

This paper presents the methodology for combining the 3 measurements used in DES Y1 to derive cosmological constraints: galaxy clustering, galaxy-galaxy lensing, and cosmic shear.


 

 

 

Map of the matter distribution inferred from DES Y1 weak lensing shape measurements.

 

Curved-sky Weak Lensing Mass Map from the First Year Data of the Dark Energy Survey

C. Chang, et al | Corresponding Author: [email protected] | Link 

Using slight distortions of the shapes of 26 million distant galaxies due to weak gravitational lensing, this paper presents a map of the projected density of dark matter that spans several billion light years. 

 

 

 

Map showing the reproducibility of DES Y1 measurements of the brightness of objects in the r-band, comparing different exposures of the same parts of sky.

 

Dark Energy Survey Year 1 Results: Photometric Data Set for Cosmology

A. Drlica-Wagner, et al | Corresponding Author: [email protected] | Link 

This paper describes the DES Y1 Gold catalog, which includes measurements of 137 million objects (galaxies and stars) in 5 filters (grizY) over 1800 square degrees of the sky. These data underlie many of the DES Y1 cosmology results.