A5073278093- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Stellar, planetary, and galactic studies
- Scientific Research and Discoveries
- CCD and CMOS Imaging Sensors
- Geophysics and Gravity Measurements
- Astronomical Observations and Instrumentation
- Computational Physics and Python Applications
- Pulsars and Gravitational Waves Research
- History and Developments in Astronomy
- Distributed and Parallel Computing Systems
- Relativity and Gravitational Theory
- Solar and Space Plasma Dynamics
- Astrophysics and Star Formation Studies
- Advanced Image Processing Techniques
- Advanced Thermodynamics and Statistical Mechanics
- Advanced Adaptive Filtering Techniques
- Impact of Light on Environment and Health
- Data-Driven Disease Surveillance
Northeastern University
2021-2025
Universidad del Noreste
2022-2025
École Polytechnique Fédérale de Lausanne
2017-2023
The Ohio State University
2014-2022
University of Hull
2022
Campbell Collaboration
2021
NGC Aerospace (Canada)
2016
University of California, Berkeley
2011-2014
Lawrence Berkeley National Laboratory
2011-2014
Center for Astrophysics Harvard & Smithsonian
2006
(Abridged) We describe here the most ambitious survey currently planned in optical, Large Synoptic Survey Telescope (LSST). A vast array of science will be enabled by a single wide-deep-fast sky survey, and LSST have unique capability faint time domain. The design is driven four main themes: probing dark energy matter, taking an inventory Solar System, exploring transient optical sky, mapping Milky Way. wide-field ground-based system sited at Cerro Pach\'{o}n northern Chile. telescope 8.4 m...
We present cosmological results from the final galaxy clustering data set of Baryon Oscillation Spectroscopic Survey, part Sloan Digital Sky Survey III. Our combined sample comprises 1.2 million massive galaxies over an effective area 9329 deg^2 and volume 18.7 Gpc^3, divided into three partially overlapping redshift slices centred at redshifts 0.38, 0.51, 0.61. measure angular diameter distance DM Hubble parameter H baryon acoustic oscillation (BAO) method after applying reconstruction to...
We present cosmological results from a combined analysis of galaxy clustering and weak gravitational lensing, using 1321 deg$^2$ $griz$ imaging data the first year Dark Energy Survey (DES Y1). combine three two-point functions: (i) cosmic shear correlation function 26 million source galaxies in four redshift bins, (ii) angular autocorrelation 650,000 luminous red five (iii) galaxy-shear cross-correlation positions shears. To demonstrate robustness these results, we use independent pairs...
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 overview paper describes the legacy prospect and discovery potential of Dark Energy Survey (DES) beyond cosmological studies, illustrating it with examples from DES early data.DES is using a wide-field camera (DECam) on 4 m Blanco Telescope in Chile to image 5000 sq deg sky five filters (grizY).
Abstract We describe the first public data release of Dark Energy Survey, DES DR1, consisting reduced single-epoch images, co-added source catalogs, and associated products services assembled over 3 yr science operations. DR1 is based on optical/near-infrared imaging from 345 distinct nights (2013 August to 2016 February) by Camera mounted 4 m Blanco telescope at Cerro Tololo Inter-American Observatory in Chile. wide-area survey covering ∼5000 deg 2 southern Galactic cap five broad...
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 measurements of the Baryon Acoustic Oscillation (BAO) scale in redshift-space using clustering quasars. consider a sample 147 000 quasars from extended Spectroscopic Survey (eBOSS) distributed over 2044 square degrees with redshifts 0.8 < z 2.2 and measure their spherically averaged both configuration Fourier space. Our observational data set 1400 simulated realizations allow us to detect preference for BAO that is greater than 2.8σ. determine distance = 1.52 3.8 per cent...
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 combine Dark Energy Survey Year 1 clustering and weak lensing data with Baryon Acoustic Oscillations (BAO) Big Bang Nucleosynthesis (BBN) experiments to constrain the Hubble constant. Assuming a flat $\Lambda$CDM model minimal neutrino mass ($\sum m_\nu = 0.06$ eV) we find $H_0=67.2^{+1.2}_{-1.0}$ km/s/Mpc (68% CL). This result is completely independent of constant measurements based on distance ladder, Cosmic Microwave Background (CMB) anisotropies (both temperature polarization), strong...
We present constraints on extensions of the minimal cosmological models dominated by dark matter and energy, $\Lambda$CDM $w$CDM, using a combined analysis galaxy clustering weak gravitational lensing from first-year data Dark Energy Survey (DES Y1) in combination with external data. consider four energy-dominated scenarios: 1) nonzero curvature $\Omega_k$, 2) number relativistic species $N_{\rm eff}$ different standard value 3.046, 3) time-varying equation-of-state energy described...
We present the first constraints on cosmology from Dark Energy Survey (DES), using weak lensing measurements preliminary Science Verification (SV) data. use 139 square degrees of SV data, which is less than 3% full DES survey area. Using cosmic shear 2-point over three redshift bins we find ${\ensuremath{\sigma}}_{8}({\mathrm{\ensuremath{\Omega}}}_{\mathrm{m}}/0.3{)}^{0.5}=0.81\ifmmode\pm\else\textpm\fi{}0.06$ (68% confidence), after marginalizing 7 systematics parameters and 3 other...
Galaxy intrinsic alignments (IA) are a critical uncertainty for current and future weak lensing measurements. We describe perturbative expansion of IA, analogous to the treatment galaxy biasing. From an astrophysical perspective, this model includes expected large-scale alignment mechanisms galaxies that pressure-supported (tidal alignment) rotation-supported torquing) as well cross-correlation between two. Alternatively, can be viewed effective capturing all relevant effects up given order....
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.
Abstract We present cosmological constraints from the sample of Type Ia supernovae (SNe Ia) discovered and measured during full 5 yr Dark Energy Survey (DES) SN program. In contrast to most previous samples, in which SNe are classified based on their spectra, we classify DES using a machine learning algorithm applied light curves four photometric bands. Spectroscopic redshifts acquired dedicated follow-up survey host galaxies. After accounting for likelihood each being an Ia, find 1635...
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 cosmological constraints from the sample of Type Ia supernovae (SN Ia) discovered during full five years Dark Energy Survey (DES) Supernova Program. In contrast to most previous samples, in which SN are classified based on their spectra, we classify DES SNe using a machine learning algorithm applied light curves four photometric bands. Spectroscopic redshifts acquired dedicated follow-up survey host galaxies. After accounting for likelihood each being Ia, find 1635 redshift range...
We measure the clustering of DES Year 1 galaxies that are intended to be combined with weak lensing samples in order produce precise cosmological constraints from joint analysis large-scale structure and correlations. Two-point correlation functions measured for a sample $6.6 \times 10^{5}$ luminous red selected using \textsc{redMaGiC} algorithm over an area $1321$ square degrees, redshift range $0.15 < z 0.9$, split into five tomographic bins. The has mean uncertainty $\sigma_{z}/(1+z) =...
We present the methodology for and detail implementation of Dark Energy Survey (DES) 3x2pt DES Year 1 (Y1) analysis, which combines configuration-space two-point statistics from three different cosmological probes: cosmic shear, galaxy-galaxy lensing, galaxy clustering, using data first year observations. have developed two independent modeling pipelines describe code validation process. derive expressions analytical real-space multi-probe covariances, their with numerical simulations....
We present a novel algorithm, FAST-PT, for performing convolution or mode-coupling integrals that appear in nonlinear cosmological perturbation theory. The algorithm uses several properties of gravitational structure formation—the locality the dark matter equations and scale invariance problem—as well as Fast Fourier Transforms to describe input power spectrum superposition laws. This yields extremely fast performance, enabling integral computations enough embed Monte Carlo Markov Chain...
Intrinsic alignment (IA) of source galaxies is one the major astrophysical systematics for ongoing and future weak lensing surveys. This paper presents first forecasts impact IA on cosmic shear measurements current surveys (DES, Euclid, LSST, WFIRST) using simulated likelihood analyses realistic covariances that include higher-order moments density field in computation. We consider a range possible scenarios test mitigation schemes, which parameterize by fraction red galaxies, normalization,...
We derive cosmological constraints from the probability distribution function (PDF) of evolved large-scale matter density fluctuations. do this by splitting lines sight based on their count tracer galaxies, and measuring both gravitational shear around counts-in-cells in overdense underdense sight, Dark Energy Survey (DES) First Year Sloan Digital Sky (SDSS) data. Our analysis uses a perturbation theory model [O. Friedrich et al., Phys. Rev. D 98, 023508 (2018)] is validated using $N$-body...
The Large Synoptic Survey Telescope (LSST) Dark Energy Science Collaboration (DESC) will use five cosmological probes: galaxy clusters, large scale structure, supernovae, strong lensing, and weak lensing. This Requirements Document (SRD) quantifies the expected dark energy constraining power of these probes individually together, with conservative assumptions about analysis methodology follow-up observational resources based on our current understanding evolution within field in coming...