Search
Results
-
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 -
Dark Energy Survey Year 3 results: Cosmology with moments of weak lensing mass maps
(2022)Physical Review DWe present a cosmological analysis using the second and third moments of the weak lensing mass (convergence) maps from the first three years of data (Y3) data of the Dark Energy Survey. The survey spans an effective area of 4139 square degrees and uses the images of over 100 million galaxies to reconstruct the convergence field. The second moment of the convergence as a function of smoothing scale contains information similar to standard ...Journal Article -
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 -
Dark Energy Survey Year 3 results: Cosmology from cosmic shear and robustness to modeling uncertainty
(2022)Physical Review DThis work and its companion paper, Amon et al. [Phys. Rev. D 105, 023514 (2022)PRVDAQ2470-001010.1103/PhysRevD.105.023514], present cosmic shear measurements and cosmological constraints from over 100 million source galaxies in the Dark Energy Survey (DES) Year 3 data. We constrain the lensing amplitude parameter S8σ8ωm/0.3 at the 3% level in ΛCDM: S8=0.759-0.023+0.025 (68% CL). Our constraint is at the 2% level when using angular scale ...Journal Article -
The PAU survey: measurement of narrow-band galaxy properties with approximate bayesian computation
(2021)Journal of Cosmology and Astroparticle PhysicsNarrow-band imaging surveys allow the study of the spectral characteristics of galaxies without the need of performing their spectroscopic follow-up. In this work, we forward-model the Physics of the Accelerating Universe Survey (PAUS) narrow-band data. The aim is to improve the constraints on the spectral coefficients used to create the galaxy spectral energy distributions (SED) of the galaxy population model in Tortorelli et al. 2020. ...Journal Article -
Dark Energy Survey Year 3 results: Curved-sky weak lensing mass map reconstruction
(2021)Monthly Notices of the Royal Astronomical SocietyWe present reconstructed convergence maps, mass maps, from the Dark Energy Survey (DES) third year (Y3) weak gravitational lensing data set. The mass maps are weighted projections of the density field (primarily dark matter) in the foreground of the observed galaxies. We use four reconstruction methods, each is a maximum a posteriori estimate with a different model for the prior probability of the map: Kaiser-Squires, null B-mode prior, ...Journal 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 -
The Dark Energy Survey: Data Release 1
(2018)The Astrophysical Journal. Supplement SeriesJournal 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: Cosmological constraints from cosmic shear
(2018)Physical Review DWe use 26×106 galaxies from the Dark Energy Survey (DES) Year 1 shape catalogs over 1321 deg2 of the sky to produce the most significant measurement of cosmic shear in a galaxy survey to date. We constrain cosmological parameters in both the flat ΛCDM and the wCDM models, while also varying the neutrino mass density. These results are shown to be robust using two independent shape catalogs, two independent photo-z calibration methods, and ...Journal Article