A5006351673- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Stellar, planetary, and galactic studies
- CCD and CMOS Imaging Sensors
- Adaptive optics and wavefront sensing
- Astrophysics and Cosmic Phenomena
- Gaussian Processes and Bayesian Inference
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Black Holes and Theoretical Physics
- Geophysics and Gravity Measurements
- Remote Sensing in Agriculture
- Space Science and Extraterrestrial Life
- Advanced Fluorescence Microscopy Techniques
- Particle physics theoretical and experimental studies
- History and Developments in Astronomy
- Earth Systems and Cosmic Evolution
- Advanced Differential Geometry Research
- Quantum Chromodynamics and Particle Interactions
- Hemophilia Treatment and Research
- Force Microscopy Techniques and Applications
Perimeter Institute
2021-2025
Stanford University
2019-2024
Ludwig-Maximilians-Universität München
2024
Lancaster University
2024
Centre National de la Recherche Scientifique
2024
Austin Peay State University
2024
University of Zurich
2024
Oak Ridge National Laboratory
2024
Aix-Marseille Université
2024
American Public University System
2024
We present UV, optical, and NIR photometry of the first electromagnetic counterpart to a gravitational wave source from Advanced LIGO/Virgo, binary neutron star merger GW170817. Our data set extends discovery optical at $0.47$ days $18.5$ post-merger, includes observations with Dark Energy Camera (DECam), Gemini-South/FLAMINGOS-2 (GS/F2), {\it Hubble Space Telescope} ({\it HST}). The spectral energy distribution (SED) inferred this $0.6$ is well described by blackbody model $T\approx 8300$...
We present constraints on cosmological parameters from the Pantheon+ analysis of 1701 light curves 1550 distinct Type Ia supernovae (SNe Ia) ranging in redshift $z=0.001$ to 2.26. This work features an increased sample size, span, and improved treatment systematic uncertainties comparison original Pantheon results a factor two improvement constraining power. For Flat$\Lambda$CDM model, we find $\Omega_M=0.334\pm0.018$ SNe alone. Flat$w_0$CDM measure $w_0=-0.90\pm0.14$ alone, H$_0=73.5\pm1.1$...
Abstract We present the Dark Energy Camera (DECam) discovery of optical counterpart first binary neutron star merger detected through gravitational-wave emission, GW170817. Our observations commenced 10.5 hr post-merger, as soon localization region became accessible from Chile. imaged 70 deg 2 in i and z bands, covering 93% initial integrated probability, to a depth necessary identify likely counterparts (e.g., kilonova). At 11.4 post-merger we bright transient located nucleus NGC 4993 at...
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 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...
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 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...
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,...
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 constrain the matter density $\Omega_{\mathrm{m}}$ and amplitude of fluctuations $\sigma_8$ within $\Lambda$CDM cosmological model with shear peak statistics angular convergence power spectra using mass maps constructed from first three years data Dark Energy Survey (DES Y3). use tomographic statistics, including cross-peaks: counts calculated on created by taking a harmonic space product two redshift bins. Our analysis follows forward-modelling scheme to create likelihood these N-body...
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...
The cosmological information extracted from photometric surveys is most robust when multiple probes of the large scale structure Universe are used. Two sensitive clustering galaxies and tangential shear background galaxy shapes produced by those foreground galaxies, so-called galaxy-galaxy lensing. Combining measurements these two two-point functions leads to constraints that independent way trace matter (the bias factor). optimal choice foreground, or lens, governed joint, but conflicting...
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...