A5089984010- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Statistical and numerical algorithms
- Stellar, planetary, and galactic studies
- Radio Astronomy Observations and Technology
- Black Holes and Theoretical Physics
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- History and Developments in Astronomy
- Astrophysical Phenomena and Observations
- Astrophysics and Star Formation Studies
- Gaussian Processes and Bayesian Inference
- Dark Matter and Cosmic Phenomena
- Space Satellite Systems and Control
- Astro and Planetary Science
- Remote Sensing in Agriculture
- Astrophysics and Cosmic Phenomena
- Soil Geostatistics and Mapping
- Planetary Science and Exploration
- Solar and Space Plasma Dynamics
- Statistical Methods and Inference
Kavli Institute for the Physics and Mathematics of the Universe
2017-2021
Ruhr University Bochum
2020-2021
The University of Tokyo
2017-2021
Leiden University
2013-2018
Heidelberg University
2010-2013
Space Telescope Science Institute
2010
We present cosmological parameter constraints from a tomographic weak gravitational lensing analysis of ~450deg$^2$ imaging data the Kilo Degree Survey (KiDS). For flat $\Lambda$CDM cosmology with prior on $H_0$ that encompasses most recent direct measurements, we find $S_8\equiv\sigma_8\sqrt{\Omega_{\rm m}/0.3}=0.745\pm0.039$. This result is in good agreement other low redshift probes large scale structure, including cosmic shear results, along pre-Planck microwave background constraints. A...
We present a joint cosmological analysis of weak gravitational lensing observations from the Kilo-Degree Survey (KiDS-1000), with redshift-space galaxy clustering Baryon Oscillation Spectroscopic (BOSS), and galaxy-galaxy overlap between KiDS-1000, BOSS spectroscopic 2-degree Field Lensing (2dFLenS). This combination large-scale structure probes breaks degeneracies parameters for individual observables, resulting in constraint on growth parameter $S_8=\sigma_8 \sqrt{\Omega_{\rm m}/0.3} =...
Abstract We measure cosmic weak lensing shear power spectra with the Subaru Hyper Suprime-Cam (HSC) survey first-year catalog covering 137 deg2 of sky. Thanks to high effective galaxy number density ∼17 arcmin−2, even after conservative cuts such as a magnitude cut i < 24.5 and photometric redshift 0.3 ≤ z 1.5, we obtain high-significance measurement in four tomographic bins, achieving total signal-to-noise ratio 16 multipole range 300 ℓ 1900. carefully account for various...
The Kilo-Degree Survey (KiDS) is an optical wide-field imaging survey carried out with the VLT Telescope and OmegaCAM camera. KiDS will image 1500 square degrees in four filters (ugri), together its near-infrared counterpart VIKING produce deep photometry nine bands. Designed for weak lensing shape photometric redshift measurements, core science driver of mapping large-scale matter distribution Universe back to a ~0.5. Secondary cases are manifold, covering topics such as galaxy evolution,...
We present cosmological parameter constraints from a joint analysis of three probes: the tomographic cosmic shear signal in $\sim$450 deg$^2$ data Kilo Degree Survey (KiDS), galaxy-matter cross-correlation galaxies Galaxies And Mass Assembly (GAMA) survey determined with KiDS weak lensing, and angular correlation function same GAMA galaxies. use fast power spectrum estimators that are based on simple integrals over real-space functions, show they practically unbiased relevant frequency...
We present measurements of the weak gravitational lensing shear power spectrum based on $450$ sq. deg. imaging data from Kilo Degree Survey. employ a quadratic estimator in two and three redshift bins extract band powers auto-correlation cross-correlation spectra multipole range $76 \leq \ell 1310$. The cosmological interpretation measured is performed Bayesian framework assuming $\Lambda$CDM model with spatially flat geometry, while accounting for small residual uncertainties calibration...
We test extensions to the standard cosmological model with weak gravitational lensing tomography using 450 deg$^2$ of imaging data from Kilo Degree Survey (KiDS). In these extended cosmologies, which include massive neutrinos, nonzero curvature, evolving dark energy, modified gravity, and running scalar spectral index, we also examine discordance between KiDS cosmic microwave background measurements Planck. The two datasets is largely unaffected by a more conservative treatment systematics...
We present a tomographic cosmic shear analysis of the Kilo-Degree Survey (KiDS) combined with VISTA Infrared Galaxy (VIKING). This is first time that full optical to near-infrared data set has been used for wide-field cosmological weak lensing experiment. unprecedented data, spanning $450~$deg$^2$, allows us improve significantly estimation photometric redshifts, such we are able include robustly higher-redshift sources measurement, and - most importantly solidify our knowledge redshift...
We present the methodology for a joint cosmological analysis of weak gravitational lensing from fourth data release ESO Kilo-Degree Survey (KiDS-1000) and galaxy clustering partially overlapping Baryon Oscillation Spectroscopic (BOSS) 2-degree Field Lensing (2dFLenS). Cross-correlations between BOSS 2dFLenS positions source ellipticities have been incorporated into analysis, necessitating development hybrid model non-linear scales that blends perturbative non-perturbative approaches, an...
We present cosmological constraints from a cosmic shear analysis of the fourth data release Kilo-Degree Survey (KiDS-1000), doubling survey area with nine-band optical and near-infrared photometry respect to previous KiDS analyses. Adopting spatially flat $\Lambda$CDM model, we find $S_8 = \sigma_8 (\Omega_{\rm m}/0.3)^{0.5} 0.759^{+0.024}_{-0.021}$ for our fiducial analysis, which is in $3\sigma$ tension prediction Planck Legacy microwave background. compare COSEBIs (Complete Orthogonal...
We compute the spherical-sky weak-lensing power spectrum of shear and convergence.We discuss various approximations, such as flat-sky, first-and second-order Limber equations for projection.We find that impact adopting these approximations is negligible when constraining cosmological parameters from current surveys.This demonstrated using data Canada-France-Hawaii Telescope Lensing Survey.We reported tension with Planck cosmic microwave background temperature anisotropy results cannot be...
We present a catalog of 5324 massive stars in the Small Magellanic Cloud (SMC), with accurate spectral types compiled from literature, and photometric for subset 3654 these stars, goal exploring their infrared properties. The consists counterparts Spitzer SAGE-SMC survey database, which we uniform photometry 0.3to24 μm UBVIJHKs+IRAC+MIPS24 bands. compare color–magnitude diagrams color–color to those Large (LMC), finding that brightest sources SMC are also red supergiants, supergiant B[e]...
Torques acting on galaxies lead to physical alignments, but the resulting ellipticity correlations are difficult predict. As they constitute a major contaminant for cosmic shear studies, it is important constrain intrinsic alignment signal observationally. We measured alignments of satellite within 90 massive galaxy clusters in redshift range 0.05 <z< 0.55 and quantified their impact signal. combined sample 38 104 with spectroscopic redshifts high-quality data from Canada-France-Hawaii...
ABSTRACT We present constraints on Horndeski gravity from a combined analysis of cosmic shear, galaxy–galaxy lensing and galaxy clustering $450\, \mathrm{deg}^2$ the Kilo-Degree Survey Galaxy And Mass Assembly survey.The class dark energy/modified models includes majority universally coupled extensions to ΛCDM with one scalar field in addition metric. study functions time that fully describe evolution linear perturbations gravity. Our results are compatible throughout model. By imposing...
We measure the weak gravitational lensing shear power spectra and their cross-power in two photometric redshift bins from Canada–France–Hawaii Telescope Lensing Survey (CFHTLenS). The measurements are performed directly multipole space terms of adjustable band powers. For extraction powers data we have implemented extended a quadratic estimator, maximum likelihood method that allows us to readily take into account irregular survey geometries, masks, varying sampling densities. find 68 per...
We propose a principled Bayesian method for quantifying tension between correlated datasets with wide uninformative parameter priors. This is achieved by extending the Suspiciousness statistic, which insensitive to Our uses global summary statistics, and as such it can be used diagnostic internal consistency. show how our approach combined methods that use space data identify existing discrepancies. As an example, we test consistency of KiDS-450 in 4 photometric redshift bins, recover...
We present constraints on extensions to the standard cosmological model of a spatially flat Universe governed by general relativity, constant (Λ), and cold dark matter (CDM) varying spatial curvature Ω K , sum neutrino masses ∑ m ν energy equation state parameter w Hu-Sawicki f ( R ) gravity 0 parameter. With combined 3 × 2 pt measurements cosmic shear from Kilo-Degree Survey (KiDS-1000), galaxy clustering Baryon Oscillation Spectroscopic (BOSS), galaxy-galaxy lensing overlap between...
We present three tiers of Bayesian consistency tests for the general case $correlated$ datasets. Building on duplicates model parameters assigned to each dataset, these range from evidence ratios as a global summary statistic, posterior distributions parameter differences, in data domain derived predictive distributions. For test we motivate meaningful threshold criteria internal Without loss generality focus mutually exclusive, correlated subsets same dataset this work. As an application,...
Upcoming and ongoing large area weak lensing surveys will also discover samples of galaxy clusters. Accurate precise masses clusters are major importance for cosmology, example, in establishing well calibrated observational halo mass functions comparison with cosmological predictions. We investigate the level statistical uncertainties sources systematic errors expected estimates. Future that cover areas on sky, such as Euclid or LSST to lesser extent DES, provide largest cluster lowest noise...
Summary statistics of the likelihood, such as Bayesian evidence, offer a principled way comparing models and assessing tension between, or within, results physical experiments. Noisy realisations data induce scatter in these model comparison statistics. For realistic case cosmological inference from large-scale structure we show that logarithm Bayes factor attains order unity, increasing significantly with stronger between under comparison. We develop an approximate procedure quantifies...
We present a revised strong lensing mass reconstruction of the galaxy cluster RX J1347.5-1145. The X-ray luminous at redshift z=0.451 has already been studied intensively in past. Based on information two such previous (strong-)lensing studies by Halkola et al. (2008) and Bradac (2008), as well incorporating newly available data from Cluster Lensing And Supernovae survey with Hubble (CLASH, Postman 2012), we identified four systems multiply lensed images (anew) range 1.75 <= z 4.19. One...
One-opposition near-Earth asteroids (NEAs) are growing in number, and they must be recovered to prevent loss mismatch risk, improve their orbits, as likely too faint for detection shallow surveys at future apparitions. We aimed recover more than half of the one-opposition NEAs recommended observations by Minor Planet Center (MPC) using Isaac Newton Telescope (INT) soft-override mode some fractions available D-nights. During about 130 hours total between 2013 2016, we targeted 368 NEAs, among...