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Dark energy survey year 3 results: Cosmology with peaks using an emulator approach
(2022)Monthly Notices of the Royal Astronomical SocietyWe constrain the matter density Omega(m) and the amplitude of density fluctuations sigma(s) within the Lambda CDM cosmological model with shear peak statistics and angular convergence power spectra using mass maps constructed from the first three years of data of the Dark Energy Survey (DES Y3). We use tomographic shear peak statistics, including cross-peaks: peak counts calculated on maps created by taking a harmonic space product of the ...Journal Article -
Constraining the baryonic feedback with cosmic shear using the DES Year-3 small-scale measurements
(2023)Monthly Notices of the Royal Astronomical SocietyWe use the small scales of the Dark Energy Survey (DES) Year-3 cosmic shear measurements, which are excluded from the DES Year-3 cosmological analysis, to constrain the baryonic feedback. To model the baryonic feedback, we adopt a baryonic correction model and use the numerical package BACCOEMU to accelerate the evaluation of the baryonic non-linear matter power spectrum. We design our analysis pipeline to focus on the constraints of the ...Journal Article -
Weak-lensing mass calibration of redMaPPer galaxy clusters in Dark Energy Survey Science Verification Data
(2017)Monthly Notices of the Royal Astronomical SocietyJournal Article -
Weak-lensing analysis of SPT-selected galaxy clusters using Dark Energy Survey Science Verification data
(2019)Monthly Notices of the Royal Astronomical SocietyWe present weak-lensing (WL) mass constraints for a sample of massive galaxy clusters detected by the South Pole Telescope (SPT) via the Sunyaev–Zel’dovich effect (SZE). We use griz imaging data obtained from the Science Verification (SV) phase of the Dark Energy Survey (DES) to fit the WL shear signal of 33 clusters in the redshift range 0.25 ≤ z ≤ 0.8 with NFW profiles and to constrain a four-parameter SPT mass–observable relation. To ...Journal Article -
Dark Energy Survey Year 1 results: weak lensing shape catalogues
(2018)Monthly Notices of the Royal Astronomical SocietyWe present two galaxy shape catalogues from the Dark Energy Survey Year 1 data set, covering 1500 deg² with a median redshift of 0.59. The catalogues cover two main fields: Stripe 82, and an area overlapping the South Pole Telescope survey region. We describe our data analysis process and in particular our shape measurement using two independent shear measurement pipelines, METACALIBRATION and IM3SHAPE. The METACALIBRATION catalogue uses ...Journal Article -
Dark Energy Survey Year 1 results: The impact of galaxy neighbours on weak lensing cosmology with IM3SHAPE
(2018)Monthly Notices of the Royal Astronomical SocietyWe use a suite of simulated images based on Year 1 of the Dark Energy Survey to explore the impact of galaxy neighbours on shape measurement and shear cosmology. The HOOPOE image simulations include realistic blending, galaxy positions, and spatial variations in depth and point spread function properties. Using the IM3SHAPE maximum-likelihood shape measurement code, we identify four mechanisms by which neighbours can have a non-negligible ...Journal Article -
Dark Energy Survey Year 1 results: Curved-sky weak lensing mass map
(2018)Monthly Notices of the Royal Astronomical SocietyWe construct the largest curved-sky galaxy weak lensing mass map to date from the DES first-year (DES Y1) data. The map, about 10 times larger than the previous work, is constructed over a contiguous ≈1500 deg2, covering a comoving volume of ≈10 Gpc3. The effects of masking, sampling, and noise are tested using simulations. We generate weak lensing maps from two DES Y1 shear catalogues, METACALIBRATION and IM3SHAPE, with sources at redshift ...Journal Article -
Cosmology from large scale galaxy clustering and galaxy-galaxy lensing with Dark Energy Survey Science Verification data
(2017)Monthly Notices of the Royal Astronomical SocietyJournal Article -
Inference from the small scales of cosmic shear with current and future Dark Energy Survey data
(2017)Monthly Notices of the Royal Astronomical SocietyCosmic shear is sensitive to fluctuations in the cosmological matter density field, including on small physical scales, where matter clustering is affected by baryonic physics in galaxies and galaxy clusters, such as star formation, supernovae feedback, and active galactic nuclei feedback. While muddying any cosmological information that is contained in small-scale cosmic shear measurements, this does mean that cosmic shear has the potential ...Journal Article