A5061797552- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Stellar, planetary, and galactic studies
- Adaptive optics and wavefront sensing
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- Distributed and Parallel Computing Systems
- Advanced Data Storage Technologies
- Astrophysics and Star Formation Studies
- Scientific Computing and Data Management
- Remote Sensing in Agriculture
- Spectroscopy and Laser Applications
- Calibration and Measurement Techniques
- Astro and Planetary Science
- Radio Astronomy Observations and Technology
- Astrophysical Phenomena and Observations
- Impact of Light on Environment and Health
- Astrophysics and Cosmic Phenomena
- History and Developments in Astronomy
- CCD and CMOS Imaging Sensors
- Scientific Research and Discoveries
- Atmospheric Ozone and Climate
- Advanced Computational Techniques and Applications
- Advanced Vision and Imaging
University of Groningen
2015-2024
Marconi University
2023-2024
Institut National de Physique Nucléaire et de Physique des Particules
2023
Centre National de la Recherche Scientifique
2023
Lyon College
2023
Université Claude Bernard Lyon 1
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2023
Centre de Recerca Matemàtica
2023
RWTH Aachen University
2023
École Polytechnique Fédérale de Lausanne
2023
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} =...
The Kilo-Degree Survey (KiDS) is a multi-band imaging survey designed for cosmological studies from weak lensing and photometric redshifts. It uses the European Southern Observatory VLT Telescope with its wide-field camera OmegaCAM. KiDS images are taken in four filters similar to Sloan Digital Sky ugri bands. best seeing time reserved deep r-band observations. median 5σ limiting AB magnitude 24.9 below 0.7 arcsec. Initial observations have concentrated on Galaxy Mass Assembly (GAMA) regions...
Context . The Kilo-Degree Survey (KiDS) is an ongoing optical wide-field imaging survey with the OmegaCAM camera at VLT Telescope, specifically designed for measuring weak gravitational lensing by galaxies and large-scale structure. When completed it will consist of 1350 square degrees imaged in four filters ( ugri ). Aims Here we present fourth public data release which more than doubles area sky covered 3. We also include aperture-matched Z Y J H K s photometry from our partner VIKING on...
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...
The Kilo Degree Survey (KiDS) is a 1500 square degree optical imaging survey with the recently commissioned OmegaCAM wide-field imager on VLT Telescope (VST). A suite of data products will be delivered to European Southern Observatory (ESO) and community by KiDS team. Spread over Europe, team uses Astro-WISE as its main tool collaborate efficiently pool hardware resources. In shares, calibrates archives all data. data-centric architectural design realizes dynamic 'live archive' in which new...
We present weak lensing shear catalogues from the fourth data release of Kilo-Degree Survey, KiDS-1000, spanning 1006 square degrees deep and high-resolution imaging. Our `gold-sample' galaxies, with well-calibrated photometric redshift distributions, consists 21 million galaxies an effective number density $6.17$ per arcminute. quantify accuracy spatial, temporal, flux-dependent point-spread function (PSF) model, verifying that model meets our requirements to induce less than a $0.1\sigma$...
Context. Studies of low surface brightness (LSB) galaxies in nearby clusters have revealed a sub-population extremely diffuse with central μ0,g′ > 24 mag arcsec-2, total luminosity Mg′ fainter than −16 and effective radius between 1.5 kpc <Re < 10 kpc. The origin these ultra (UDGs) is still unclear, although several theories been suggested. As the UDGs overlap dwarf-sized their luminosities, it important to compare properties same environment. If continuum found rest LSB population, would be...
Context. The Kilo-Degree Survey (KiDS) is an ongoing optical wide-field imaging survey with the OmegaCAM camera at VLT Telescope. It aims to image 1500 square degrees in four filters (ugri). core science driver mapping large-scale matter distribution Universe, using weak lensing shear and photometric redshift measurements. Further cases include galaxy evolution, Milky Way structure, detection of high-redshift clusters, finding rare sources such as strong lenses quasars.
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 present scaling relations between structural properties of nuclear star clusters and their host galaxies for a sample early-type dwarf observed as part the Hubble Space Telescope (HST) Advanced Camera Surveys (ACS) Coma Cluster Survey.We have analysed light profiles 200 in magnitude range 16.0 < m F814W 22.6 mag, corresponding to -19.0 M -12.4 mag.Nuclear are detected 80 per cent galaxies, thus doubling HST-observed with clusters.We confirm that cluster detection fraction decreases...
In recent years, multiple studies have reported substantial populations of large, low-surface-brightness galaxies in local galaxy clusters. Various theories that aim to explain the presence such ultra-diffuse (UDGs) since been proposed. A key question will help differentiate between models is whether UDGs counterparts lower-mass host haloes, and what their abundance as a function halo mass is. this study we extend our previous clusters groups. We measure 325 spectroscopically-selected groups...
The Fornax Deep Survey (FDS), an imaging survey in the u', g', r', and i'-bands, has a supreme resolution image depth compared to previous spatially complete Cluster Catalog (FCC). Our new data allows us study galaxies down r'-band magnitude m$_{r'}\approx$21 mag (M$_{r'}\approx$-10.5 mag). These provide important legacy dataset cluster. We aim present (FDS) dwarf galaxy catalog, focusing on explaining reduction calibrations, assessing quality of data, describing methods used for defining...
Verlinde proposed that the observed excess gravity in galaxies and clusters is consequence of emergent (EG). In this theory, standard gravitational laws are modified on galactic larger scales due to displacement dark energy by baryonic matter. EG gives an estimate (described as apparent matter density) terms mass distribution Hubble parameter. work, we present first test using weak lensing, within regime validity current model. Although there no direct description lensing cosmology yet, can...
We present measurements of the radial gravitational acceleration around isolated galaxies, comparing expected given baryonic matter with observed acceleration, using weak lensing from fourth data release Kilo-Degree Survey. These extend relation (RAR) by 2 decades into low-acceleration regime beyond outskirts observable galaxy. compare our RAR to predictions two modified gravity (MG) theories: MOND and Verlinde's emergent gravity. find that measured agrees well MG predictions. In addition,...
We present the results of our first year quasar search in on-going ESO public Kilo Degree Survey (KiDS) and VISTA Kilo-Degree Infrared Galaxy (VIKING) surveys. These surveys are among deeper wide-field that can be used to uncovered large numbers z~6 quasars. This allows us probe a more common population quasars is fainter than well-studied from main Sloan Digital Sky Survey. From this set combined survey catalogues covering ~250 deg^2 we selected point sources down Z_AB=22 had very red i-Z...