TY - JOUR
T1 - Cosmic shear in harmonic space from the Dark Energy Survey Year 1 Data
T2 - compatibility with configuration space results
AU - DES Collaboration
AU - Camacho, H
AU - Andrade-Oliveira, F
AU - Troja, A
AU - Rosenfeld, R
AU - Faga, L
AU - Gomes, R
AU - Doux, C
AU - Fang, X
AU - Lima, M
AU - Miranda, V
AU - Eifler, TF
AU - Friedrich, O
AU - Gatti, M
AU - Bernstein, GM
AU - Blazek, J
AU - Bridle, SL
AU - Choi, A
AU - Davis, C
AU - DeRose, J
AU - Gaztanaga, E.
AU - Gruen, D
AU - Hartley, WG
AU - Hoyle, B
AU - Jarvis, M
AU - MacCrann, N
AU - Prat, J
AU - Rau, MM
AU - Samuroff, S
AU - Sánchez, C
AU - Sheldon, E
AU - Troxel, MA
AU - Vielzeuf, P
AU - Zuntz, J
AU - Abbott, TMC
AU - Aguena, M
AU - Allam, S
AU - Annis, J
AU - Bacon, D.
AU - Bertin, E
AU - Brooks, D
AU - Burke, DL
AU - Rosell, AC
AU - Kind, MC
AU - Carretero, J
AU - Castander, FJ
AU - Marshall, JL
AU - Morgan, R
AU - Smith, M
AU - Thomas, D.
AU - Weller, J
PY - 2022/11/1
Y1 - 2022/11/1
N2 - We perform a cosmic shear analysis in harmonic space using the first year of data collected by the Dark Energy Survey (DES-Y1). We measure the cosmic weak lensing shear power spectra using the metacalibration catalogue and perform a likelihood analysis within the framework of CosmoSIS. We set scale cuts based on baryonic effects contamination and model redshift and shear calibration uncertainties as well as intrinsic alignments. We adopt as fiducial covariance matrix an analytical computation accounting for the mask geometry in the Gaussian term, including non-Gaussian contributions. A suite of 1200 lognormal simulations is used to validate the harmonic space pipeline and the covariance matrix. We perform a series of stress tests to gauge the robustness of the harmonic space analysis. Finally, we use the DES-Y1 pipeline in configuration space to perform a similar likelihood analysis and compare both results, demonstrating their compatibility in estimating the cosmological parameters S8, σ8, and Ωm. We use the DES-Y1 metacalibration shape catalogue, with photometric redshifts estimates in the range of 0.2−1.3, divided in four tomographic bins finding σ8(Ωm/0.3)0.5 = 0.766 ± 0.033 at 68 per cent CL. The methods implemented and validated in this paper will allow us to perform a consistent harmonic space analysis in the upcoming DES data.
AB - We perform a cosmic shear analysis in harmonic space using the first year of data collected by the Dark Energy Survey (DES-Y1). We measure the cosmic weak lensing shear power spectra using the metacalibration catalogue and perform a likelihood analysis within the framework of CosmoSIS. We set scale cuts based on baryonic effects contamination and model redshift and shear calibration uncertainties as well as intrinsic alignments. We adopt as fiducial covariance matrix an analytical computation accounting for the mask geometry in the Gaussian term, including non-Gaussian contributions. A suite of 1200 lognormal simulations is used to validate the harmonic space pipeline and the covariance matrix. We perform a series of stress tests to gauge the robustness of the harmonic space analysis. Finally, we use the DES-Y1 pipeline in configuration space to perform a similar likelihood analysis and compare both results, demonstrating their compatibility in estimating the cosmological parameters S8, σ8, and Ωm. We use the DES-Y1 metacalibration shape catalogue, with photometric redshifts estimates in the range of 0.2−1.3, divided in four tomographic bins finding σ8(Ωm/0.3)0.5 = 0.766 ± 0.033 at 68 per cent CL. The methods implemented and validated in this paper will allow us to perform a consistent harmonic space analysis in the upcoming DES data.
KW - (cosmology:) large-scale structure of Universe
KW - Cosmology: observations
KW - Gravitational lensing: weak
KW - UKRI
KW - STFC
UR - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=webofscienceportsmouth2022&SrcAuth=WosAPI&KeyUT=WOS:000863748400005&DestLinkType=FullRecord&DestApp=WOS_CPL
U2 - 10.1093/mnras/stac2543
DO - 10.1093/mnras/stac2543
M3 - Article
SN - 0035-8711
VL - 516
SP - 5799
EP - 5815
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -