A5033796141- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- CCD and CMOS Imaging Sensors
- Dark Matter and Cosmic Phenomena
- Astro and Planetary Science
- Radio Astronomy Observations and Technology
- Astrophysics and Star Formation Studies
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Aerospace Engineering and Energy Systems
- Infrared Target Detection Methodologies
- Astrophysical Phenomena and Observations
- earthquake and tectonic studies
- Geophysics and Gravity Measurements
- Anomaly Detection Techniques and Applications
- Atmospheric Ozone and Climate
- Advanced Semiconductor Detectors and Materials
- Scientific Research and Discoveries
- Gaussian Processes and Bayesian Inference
- Fault Detection and Control Systems
- Advanced Measurement and Metrology Techniques
California Institute of Technology
2019-2025
Jet Propulsion Laboratory
2016-2024
The Ohio State University
2011-2022
University of California, Berkeley
2005-2011
Lawrence Berkeley National Laboratory
2010
University of Arizona
2009
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...
We use 26×106 galaxies from the Dark Energy Survey (DES) Year 1 shape catalogs over 1321 deg2 of sky to produce most significant measurement cosmic shear in a galaxy survey date. constrain cosmological parameters both flat ΛCDM and wCDM models, while also varying neutrino mass density. These results are shown be robust using two independent catalogs, photo-z calibration methods, analysis pipelines blind analysis. find 3.5% fractional uncertainty on σ8(Ωm/0.3)0.5=0.782+0.027−0.027 at 68%...
We present two galaxy shape catalogues from the Dark Energy Survey Year 1 data set, covering 1500 square degrees with a median redshift of $0.59$. The cover main fields: Stripe 82, and an area overlapping South Pole Telescope survey region. describe our analysis process in particular measurement using independent shear pipelines, METACALIBRATION IM3SHAPE. catalogue uses Gaussian model innovative internal calibration scheme, was applied to $riz$-bands, yielding 34.8M objects. IM3SHAPE...
The Wide Field Infrared Survey Telescope (WFIRST) is a 2.4m space telescope with 0.281 deg^2 field of view for near-IR imaging and slitless spectroscopy coronagraph designed > 10^8 starlight suppresion. As background information Astro2020 white papers, this article summarizes the current design anticipated performance WFIRST. While WFIRST does not have UV imaging/spectroscopic capabilities Hubble Space Telescope, wide surveys hundreds times more efficient. Some most ambitious multi-cycle...
We present weak lensing shear catalogues for 139 square degrees of data taken during the Science Verification (SV) time new Dark Energy Camera (DECam) being used Survey (DES). describe our object selection, point spread function estimation and measurement procedures using two independent pipelines, im3shape ngmix, which produce 2.12 million 3.44 galaxies, respectively. detail a set null tests measurements find that they pass requirements systematic errors at level necessary science...
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 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....
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.
One of the primary limiting sources systematic uncertainty in forthcoming weak lensing measurements is quantitative relationship between distortions due to gravitational and measurable properties galaxy images. We present a statistically principled, general solution this problem. Our technique infers multiplicative shear calibration parameters by modifying actual survey data simulate effects known shear. It can be applied any estimation method based on weighted averages shape measurements,...
Abstract Metacalibration is a recently introduced method to accurately measure weak gravitational lensing shear using only the available imaging data, without need for prior information about galaxy properties or calibration from simulations. The involves distorting image with small known shear, and calculating response of estimator that applied shear. was shown be accurate in moderate-sized simulations images had relatively high signal-to-noise ratios, significant selection effects. In this...
We simulate the scientific performance of Wide-Field Infrared Survey Telescope (WFIRST) High Latitude (HLS) on dark energy and modified gravity. The 1.6 year HLS Reference survey is currently envisioned to image 2000 deg$^2$ in multiple bands a depth $\sim$26.5 Y, J, H cover same area with slit-less spectroscopy beyond z=3. combination deep, multi-band photometry deep will allow scientists measure growth geometry Universe through variety cosmological probes (e.g., weak lensing, galaxy...
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...
ABSTRACT In this work, we present the galaxy clustering measurements of two DES lens samples: a magnitude-limited sample optimized for measurement cosmological parameters, maglim, and luminous red galaxies selected with redmagic algorithm. maglim/redmagic contains over 10 million/2.5 million is divided into six/five photometric redshift bins spanning range z ∈ [0.20, 1.05]/z [0.15, 0.90]. Both samples cover 4143 $\deg ^2$ which perform our analysis blind, measuring angular correlation...
We present cosmological constraints from the analysis of angular power spectra cosmic shear maps based on data first three years observations by Dark Energy Survey (DES Y3). Our measurements are pseudo-$C_\ell$ method and offer a view complementary to that two-point correlation functions in real space, as two estimators known compress select Gaussian information different ways, due scale cuts. They may also be differently affected systematic effects theoretical uncertainties, such baryons...
We describe an updated calibration and diagnostic framework, Balrog, used to directly sample the selection photometric biases of Dark Energy Survey's (DES) Year 3 (Y3) dataset. systematically inject onto single-epoch images a random 20% subset DES footprint ensemble nearly 30 million realistic galaxy models derived from Deep Field observations. These augmented are analyzed in parallel with original data automatically inherit measurement systematics that often too difficult capture...
We present and characterize the galaxy-galaxy lensing signal measured using first three years of data from Dark Energy Survey (DES Y3) covering 4132 deg$^2$. These measurements are used in DES Y3 3$\times$2pt cosmological analysis, which combines weak galaxy clustering information. use two lens samples: a magnitude-limited sample redMaGic sample, span redshift range $\sim 0.2-1$ with 10.7 M 2.6 galaxies respectively. For source catalog, we Metacalibration shape consisting $\simeq$100...
Cross-correlations of galaxy positions and shears with maps gravitational lensing the cosmic microwave background (CMB) are sensitive to distribution large-scale structure in Universe. Such cross-correlations also expected be immune some systematic effects that complicate correlation measurements internal surveys. We present modeling between measured first three years data from Dark Energy Survey CMB derived a combination 2500 deg2 SPT-SZ survey conducted South Pole Telescope full-sky Planck...
Number counts of galaxy clusters across redshift are a powerful cosmological probe, if precise and accurate reconstruction the underlying mass distribution is performed -- challenge called calibration. With advent wide deep photometric surveys, weak gravitational lensing by has become method choice to perform this measurement. We measure validate (WL) signature in shape galaxies observed first 3 years DES Y3 caused selected all-sky survey SRG/eROSITA. These data then used determine scaling...
Accurate statistical measurement with large imaging surveys has traditionally required throwing away a sizable fraction of the data. This is because most measurements have relied on selecting nearly complete samples, where variations in composition galaxy population seeing, depth, or other survey characteristics are small. We introduce new method that aims to minimize this wastage, allowing precision for any class stars galaxies detectable an survey. implemented our proposal Balrog, software...
We construct the largest curved-sky galaxy weak lensing mass map to date from DES first-year (DES Y1) data. The map, about 10 times larger than previous work, is constructed over a contiguous ≈1500 deg2, covering comoving volume of ≈10 Gpc3. effects masking, sampling, and noise are tested using simulations. generate maps two Y1 shear catalogues, MetaCalibration Im3shape, with sources at redshift 0.2 < z 1.3, in each four bins this range. In highest signal-to-noise ratio between mean signal...
Using the first three years of data from Dark Energy Survey, we use ratios small-scale galaxy-galaxy lensing measurements around same lens sample to constrain source redshift uncertainties, intrinsic alignments and other nuisance parameters our model. Instead using a simple geometric approach for ratios, full modeling measurements, including corresponding integration over power spectrum contributions magnification. We perform extensive testing shear ratio (SR) by studying impact different...