S. Everett
A5005790069- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- CCD and CMOS Imaging Sensors
- Gaussian Processes and Bayesian Inference
- Pulsars and Gravitational Waves Research
- Remote Sensing in Agriculture
- Impact of Light on Environment and Health
- Scientific Research and Discoveries
- Advanced Vision and Imaging
- Aerospace Engineering and Energy Systems
- Planetary Science and Exploration
- Atmospheric Ozone and Climate
- Statistical and numerical algorithms
- Computational Physics and Python Applications
- Spacecraft and Cryogenic Technologies
Jet Propulsion Laboratory
2022-2025
California Institute of Technology
2023-2025
University College London
2024
University of Oslo
2024
Columbia University
2023
University of Michigan
2023
University of Hull
2023
University of California, Santa Cruz
2019-2022
The Ohio State University
2022
Campbell Collaboration
2021
We present the first cosmology results from large-scale structure in Dark Energy Survey (DES) spanning 5000 deg$^2$. perform an analysis combining three two-point correlation functions (3$\times$2pt): (i) cosmic shear using 100 million source galaxies, (ii) galaxy clustering, and (iii) cross-correlation of with lens positions. The was designed to mitigate confirmation or observer bias; we describe specific changes made sample following unblinding results. model data within flat $\Lambda$CDM...
This work, together with its companion paper, Secco and Samuroff et al. (2021), presents the Dark Energy Survey Year 3 cosmic shear measurements cosmological constraints based on an analysis of over 100 million source galaxies. With data spanning 4143 deg$^2$ sky, divided into four redshift bins, we produce highest significance measurement to date, a signal-to-noise 40. We conduct blind in context $\Lambda$CDM model find 3% constraint clustering amplitude, $S_8\equiv \sigma_8 (\Omega_{\rm...
This work and its companion paper, Amon et al. (2021), present cosmic shear measurements cosmological constraints from over 100 million source galaxies in the Dark Energy Survey (DES) Year 3 data. We constrain lensing amplitude parameter $S_8\equiv\sigma_8\sqrt{\Omega_\textrm{m}/0.3}$ at 3% level $\Lambda$CDM: $S_8=0.759^{+0.025}_{-0.023}$ (68% CL). Our constraint is 2% when using angular scale cuts that are optimized for $\Lambda$CDM analysis: $S_8=0.772^{+0.018}_{-0.017}$ With alone, we...
We perform a comprehensive study of Milky Way (MW) satellite galaxies to constrain the fundamental properties dark matter (DM). This analysis fully incorporates inhomogeneities in spatial distribution and detectability MW satellites marginalizes over uncertainties mapping between DM halos, system, disruption subhalos by disk. Our results are consistent with cold, collisionless paradigm yield strongest cosmological constraints date on particle models warm, interacting, fuzzy matter. At 95%...
We constrain the mass–richness scaling relation of redMaPPer galaxy clusters identified in Dark Energy Survey Year 1 data using weak gravitational lensing. split into 4 × 3 bins richness λ and redshift |$z$| for ≥ 20 0.2 ≤ 0.65 measure mean masses these their stacked lensing signal. By modelling as 〈M200m|λ, |$z$|〉 = M0(λ/40)F((1 + |$z$|)/1.35)G, we normalization at 5.0 per cent level, finding M0 [3.081 ± 0.075(stat) 0.133(sys)] · 1014 M⊙ 40 0.35. The recovered index is F 1.356 0.051 (stat)...
We describe the Dark Energy Survey (DES) photometric data set assembled from first three years of science operations to support DES Year 3 cosmology analyses, and provide usage notes aimed at broad astrophysics community. Y3 Gold improves on previous releases DES, Y1 Data Release 1 (DES DR1), presenting an expanded curated that incorporates algorithmic developments in image detrending processing, calibration, object classification. comprises nearly 5000 square degrees grizY imaging south...
Abstract We report the results of a systematic search for ultra-faint Milky Way satellite galaxies using data from Dark Energy Survey (DES) and Pan-STARRS1 (PS1). Together, DES PS1 provide multi-band photometry in optical/near-infrared wavelengths over ∼80% sky. Our targets ∼25,000 deg 2 high-Galactic-latitude sky reaching 10 σ point-source depth ≳22.5 mag g r bands. While galaxy searches have been performed independently on before, this is first time that self-consistent across both sets....
ABSTRACT We present and characterize the galaxy shape catalogue from first 3 yr of Dark Energy Survey (DES) observations, over an effective area 4143 deg2 southern sky. describe our data analysis process self-calibrating shear measurement pipeline metacalibration, which builds improves upon used in DES Year 1 several aspects. The weak-lensing consists 100 204 026 galaxies, measured riz bands, resulting a weighted source number density neff = 5.59 gal arcmin−2 corresponding noise σe 0.261....
Determining the distribution of redshifts galaxies observed by wide-field photometric experiments like Dark Energy Survey is an essential component to mapping matter density field with gravitational lensing. In this work we describe methods used assign individual weak lensing source from Year 3 Weak Lensing Source Catalogue four tomographic bins and estimate redshift distributions in these bins. As first application data, validate that assumptions made apply DES Y3 develop a full treatment...
We present a joint cosmic shear analysis of the Dark Energy Survey (DES Y3) and Kilo-Degree (KiDS-1000) in collaborative effort between two survey teams. find consistent cosmological parameter constraints DES Y3 KiDS-1000 which, when combined joint-survey analysis, constrain $S_8 = \sigma_8 \sqrt{\Omega_{\rm m}/0.3}$ with mean value $0.790^{+0.018}_{-0.014}$. The marginal is lower than maximum posteriori estimate, $S_8=0.801$, owing to skewness distribution projection effects...
The authors use Dark Energy Survey data on galaxy clustering and lensing from the first three years of observations combined with five prominent external datasets. They robustly constrain six potential extensions to currently prevalent cosmological paradigm \ensuremath{\Lambda}CDM (Cold Matter a constant). All would add significant new physics, such as deviations General Relativity or non-zero spatial curvature, but no evidence for physics is found.
We present angular diameter measurements obtained by measuring the position of Baryon Acoustic Oscillations (BAO) in an optimised sample galaxies from first three years Dark Energy Survey data (DES Y3). The consists 7 million distributed over a footprint 4100 deg$^2$ with $0.6 < z_{\rm photo} 1.1$ and typical redshift uncertainty $0.03(1+z)$. selection is same as BAO measurement year DES data, but analysis presented here uses times area, extends to higher makes number improvements, including...
We present cosmological constraints from the analysis of two-point correlation functions between galaxy positions and lensing measured in Dark Energy Survey (DES) Year 3 data measurements cosmic microwave background (CMB) South Pole Telescope (SPT) Planck. When jointly analyzing DES-only DES cross-correlations with SPT+Planck CMB lensing, we find Ωm=0.344±0.030 S8≡σ8(Ωm/0.3)0.5=0.773±0.016, assuming ΛCDM. additionally combining autospectrum, Ωm=0.306+0.018−0.021 S8=0.792±0.012. The high...
We present a measurement of the cross-correlation between MagLim galaxies selected from Dark Energy Survey (DES) first three years observations (Y3) and cosmic microwave background (CMB) lensing Atacama Cosmology Telescope (ACT) Data Release 4 (DR4), reconstructed over $\sim 436$ sq.deg. sky. Our galaxy sample, which covers 4143$ sq.deg., is divided into six redshift bins spanning range $0.20<z<1.05$. adopt blinding procedure until passing all consistency systematics tests. After imposing...
ABSTRACT We measure the current expansion rate of Universe, Hubble’s constant $H_0$, by calibrating absolute magnitudes supernovae to distances measured baryon acoustic oscillations (BAO). This ‘inverse distance ladder’ technique provides an alternative using nearby measurements, replacing calibration with a high-redshift anchor. use recent release 1829 from Dark Energy Survey spanning $0.01\lt z\lt 1.13$ anchored oscillation measurements Spectroscopic Instrument (DESI) $0.30 \lt...
We present a measurement of the Hubble constant $H_0$ using gravitational wave (GW) event GW190814, which resulted from coalescence 23 $M_\odot$ black hole with 2.6 compact object, as standard siren. No compelling electromagnetic counterpart has been identified for this event, thus our analysis accounts thousands potential host galaxies within statistical framework. The redshift information is obtained photometric (photo-$z$) catalog Dark Energy Survey. luminosity distance provided by...
ABSTRACT As the statistical power of galaxy weak lensing reaches per cent level precision, large, realistic, and robust simulations are required to calibrate observational systematics, especially given increased importance object blending as survey depths increase. To capture coupled effects in both shear photometric redshift calibration, we define effective distribution for lensing, nγ(z), describe how estimate it using image simulations. We use an extensive suite tailored characterize...
We present the first joint analysis of cluster abundances and auto or cross-correlations three cosmic tracer fields: galaxy density, weak gravitational lensing shear, density split by optical richness. From a (4×2pt+N) abundances, cross-correlations, correlations measured from year data Dark Energy Survey, we obtain Ωm=0.305+0.055−0.038 σ8=0.783+0.064−0.054. This result is consistent with constraints DES-Y1 clustering two-point correlation functions for flat νΛCDM model. Consequently,...
We perform a joint analysis of the counts redMaPPer clusters selected from Dark Energy Survey (DES) Y1 data and multi-wavelength follow-up collected within 2500 deg$^2$ South Pole Telescope (SPT) SZ survey. The SPT data, calibrating richness--mass relation optically catalog, enable cosmological exploitation DES cluster abundance data. To explore possible systematics related to modeling projection effects, we consider two calibrations observational scatter on richness estimates: simple...
ABSTRACT We describe and test the fiducial covariance matrix model for combined two-point function analysis of Dark Energy Survey Year 3 (DES-Y3) data set. Using a variety new ansatzes modelling testing, we validate assumptions approximations this model. These include assumption Gaussian likelihood, trispectrum contribution to covariance, impact evaluating at wrong set parameters, masking survey geometry, deviations from Poissonian shot noise, galaxy weighting schemes, other sub-dominant...
ABSTRACT We present reconstructed convergence maps, mass from the Dark Energy Survey (DES) third year (Y3) weak gravitational lensing data set. The maps are weighted projections of density field (primarily dark matter) in foreground observed galaxies. use four reconstruction methods, each is a maximum posteriori estimate with different model for prior probability map: Kaiser–Squires, null B-mode prior, Gaussian and sparsity prior. All methods implemented on celestial sphere to accommodate...
ABSTRACT We evaluate the consistency between lensing and clustering based on measurements from Baryon Oscillation Spectroscopic Survey combined with galaxy–galaxy Dark Energy (DES) Year 3, Hyper Suprime-Cam Subaru Strategic Program (HSC) 1, Kilo-Degree (KiDS)-1000. find good agreement these data sets. model observations using Emulator fit at two fixed cosmologies: Planck (S8 = 0.83), a Lensing cosmology 0.76). For joint analysis limited to large scales, we that both cosmologies provide an...
We constrain cosmological and galaxy-bias parameters using the combination of galaxy clustering galaxy-galaxy lensing measurements from Dark Energy Survey Year-3 data. describe our modeling framework, choice scales analyzed, validating their robustness to theoretical uncertainties in small-scale by analyzing simulated Using a linear bias model redMaGiC sample, we obtain constraints on matter density be $\Omega_{\rm m} = 0.325^{+0.033}_{-0.034}$. also implement non-linear probe smaller that...
Quantifying tensions -- inconsistencies amongst measurements of cosmological parameters by different experiments has emerged as a crucial part modern data analysis. Statistically-significant between two or probes may indicate new physics extending beyond the standard model and need to be promptly identified. We apply several tension estimators proposed in literature Dark Energy Survey (DES) large-scale structure measurement Planck cosmic microwave background data. first evaluate...
We present the calibration of Dark Energy Survey Year 3 (DES Y3) weak lensing source galaxy redshift distributions $n(z)$ from clustering measurements. In particular, we cross-correlate (WL) galaxies sample with redMaGiC (luminous red secure photometric redshifts) and a spectroscopic BOSS/eBOSS to estimate distribution DES sources sample. Two distinct methods for using statistics are described. The first uses information independently mean within window, as done in Y1 analysis. second method...