scholarly journals Dark Energy Survey Year 1 Results: Cross-correlation between Dark Energy Survey Y1 galaxy weak lensing and South Pole Telescope +Planck CMB weak lensing

2019 ◽  
Vol 100 (4) ◽  
Author(s):  
Y. Omori ◽  
E. J. Baxter ◽  
C. Chang ◽  
D. Kirk ◽  
A. Alarcon ◽  
...  
Keyword(s):  
Dark Energy ◽  
Cross Correlation ◽  
Weak Lensing ◽  
South Pole ◽  
Dark Energy Survey ◽  
South Pole Telescope ◽  
Energy Survey

scholarly journals Measurement of the splashback feature around SZ-selected Galaxy clusters with DES, SPT, and ACT

2019 ◽  
Vol 487 (2) ◽  
pp. 2900-2918 ◽  
Author(s):  
T Shin ◽  
S Adhikari ◽  
E J Baxter ◽  
C Chang ◽  
B Jain ◽  
...  
Keyword(s):  
Dark Energy ◽  
Galaxy Clusters ◽  
Selection Effects ◽  
South Pole ◽  
Atacama Cosmology Telescope ◽  
Dark Energy Survey ◽  
South Pole Telescope ◽  
The Galaxy ◽  
Blue Galaxies ◽  
Energy Survey

ABSTRACT We present a detection of the splashback feature around galaxy clusters selected using the Sunyaev–Zel’dovich (SZ) signal. Recent measurements of the splashback feature around optically selected galaxy clusters have found that the splashback radius, rsp, is smaller than predicted by N-body simulations. A possible explanation for this discrepancy is that rsp inferred from the observed radial distribution of galaxies is affected by selection effects related to the optical cluster-finding algorithms. We test this possibility by measuring the splashback feature in clusters selected via the SZ effect in data from the South Pole Telescope SZ survey and the Atacama Cosmology Telescope Polarimeter survey. The measurement is accomplished by correlating these cluster samples with galaxies detected in the Dark Energy Survey Year 3 data. The SZ observable used to select clusters in this analysis is expected to have a tighter correlation with halo mass and to be more immune to projection effects and aperture-induced biases, potentially ameliorating causes of systematic error for optically selected clusters. We find that the measured rsp for SZ-selected clusters is consistent with the expectations from simulations, although the small number of SZ-selected clusters makes a precise comparison difficult. In agreement with previous work, when using optically selected redMaPPer clusters with similar mass and redshift distributions, rsp is ∼2σ smaller than in the simulations. These results motivate detailed investigations of selection biases in optically selected cluster catalogues and exploration of the splashback feature around larger samples of SZ-selected clusters. Additionally, we investigate trends in the galaxy profile and splashback feature as a function of galaxy colour, finding that blue galaxies have profiles close to a power law with no discernible splashback feature, which is consistent with them being on their first infall into the cluster.

scholarly journals Weak-lensing analysis of SPT-selected galaxy clusters using Dark Energy Survey Science Verification data

2019 ◽  
Vol 485 (1) ◽  
pp. 69-87 ◽  
Author(s):  
C Stern ◽  
J P Dietrich ◽  
S Bocquet ◽  
D Applegate ◽  
J J Mohr ◽  
...  
Keyword(s):  
Dark Energy ◽  
Galaxy Clusters ◽  
Weak Lensing ◽  
Dark Energy Survey ◽  
Energy Survey

scholarly journals Dark Energy Survey Year 1 Results: Cosmological constraints from cluster abundances and weak lensing

2020 ◽  
Vol 102 (2) ◽  
Author(s):  
T. M. C. Abbott ◽  
M. Aguena ◽  
A. Alarcon ◽  
S. Allam ◽  
S. Allen ◽  
...  
Keyword(s):  
Dark Energy ◽  
Weak Lensing ◽  
Cosmological Constraints ◽  
Dark Energy Survey ◽  
Energy Survey

scholarly journals Dark Energy Survey Year 1 Results: redshift distributions of the weak-lensing source galaxies

2018 ◽  
Vol 478 (1) ◽  
pp. 592-610 ◽  
Author(s):  
B Hoyle ◽  
D Gruen ◽  
G M Bernstein ◽  
M M Rau ◽  
J De Vicente ◽  
...  
Keyword(s):  
Dark Energy ◽  
Weak Lensing ◽  
Dark Energy Survey ◽  
Energy Survey

scholarly journals Dark Energy Survey Year 1 results: the impact of galaxy neighbours on weak lensing cosmology with im3shape

2017 ◽  
Vol 475 (4) ◽  
pp. 4524-4543 ◽  
Author(s):  
S Samuroff ◽  
S L Bridle ◽  
J Zuntz ◽  
M A Troxel ◽  
D Gruen ◽  
...  
Keyword(s):  
Dark Energy ◽  
Weak Lensing ◽  
Dark Energy Survey ◽  
The Impact ◽  
Energy Survey

scholarly journals Dark Energy Survey Year 1 results: validation of weak lensing cluster member contamination estimates from P(z) decomposition

2019 ◽  
Vol 489 (2) ◽  
pp. 2511-2524 ◽  
Author(s):  
T N Varga ◽  
J DeRose ◽  
D Gruen ◽  
T McClintock ◽  
S Seitz ◽  
...  
Keyword(s):  
Dark Energy ◽  
Decomposition Method ◽  
Weak Lensing ◽  
Cluster Member ◽  
Photometric Redshift ◽  
Cluster Mass ◽  
Dark Energy Survey ◽  
Mass Calibration ◽  
The Masses ◽  
Energy Survey

ABSTRACT Weak lensing source galaxy catalogues used in estimating the masses of galaxy clusters can be heavily contaminated by cluster members, prohibiting accurate mass calibration. In this study, we test the performance of an estimator for the extent of cluster member contamination based on decomposing the photometric redshift P(z) of source galaxies into contaminating and background components. We perform a full scale mock analysis on a simulated sky survey approximately mirroring the observational properties of the Dark Energy Survey Year One observations (DES Y1), and find excellent agreement between the true number profile of contaminating cluster member galaxies in the simulation and the estimated one. We further apply the method to estimate the cluster member contamination for the DES Y1 redMaPPer cluster mass calibration analysis, and compare the results to an alternative approach based on the angular correlation of weak lensing source galaxies. We find indications that the correlation based estimates are biased by the selection of the weak lensing sources in the cluster vicinity, which does not strongly impact the P(z) decomposition method. Collectively, these benchmarks demonstrate the strength of the P(z) decomposition method in alleviating membership contamination and enabling highly accurate cluster weak lensing studies without broad exclusion of source galaxies, thereby improving the total constraining power of cluster mass calibration via weak lensing.

scholarly journals Redshift distributions of galaxies in the Dark Energy Survey Science Verification shear catalogue and implications for weak lensing

2016 ◽  
Vol 94 (4) ◽  
Author(s):  
C. Bonnett ◽  
M. A. Troxel ◽  
W. Hartley ◽  
A. Amara ◽  
B. Leistedt ◽  
...  
Keyword(s):  
Dark Energy ◽  
Weak Lensing ◽  
Dark Energy Survey ◽  
Energy Survey

scholarly journals Dark Energy Survey Year 1 results: weak lensing mass calibration of redMaPPer galaxy clusters

2018 ◽  
Vol 482 (1) ◽  
pp. 1352-1378 ◽  
Author(s):  
T McClintock ◽  
T N Varga ◽  
D Gruen ◽  
E Rozo ◽  
E S Rykoff ◽  
...  
Keyword(s):  
Dark Energy ◽  
Galaxy Clusters ◽  
Weak Lensing ◽  
Dark Energy Survey ◽  
Mass Calibration ◽  
Energy Survey
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