W. E. Schaap
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View article: Density estimators in particle hydrodynamics
Density estimators in particle hydrodynamics Open
We present the results of a study comparing density maps reconstructed by the Delaunay Tessellation Field Estimator (DTFE) and by regular SPH kernel-based techniques. The density maps are constructed from the outcome of an SPH particle hyd…
View article: Density Estimators in Particle Hydrodynamics: DTFE versus regular SPH
Density Estimators in Particle Hydrodynamics: DTFE versus regular SPH Open
We present the results of a study confronting density maps reconstructed by the Delaunay Tessellation Field Estimator (DTFE) and by regular SPH kernel-based techniques. The comparison between the two methods clearly demonstrates the superi…
View article: Deprojection of luminosity functions of galaxies in the Coma cluster
Deprojection of luminosity functions of galaxies in the Coma cluster Open
\n We use a simple analytic model to deproject 2-d\nluminosity functions (LF) of galaxies in the Coma cluster measured by Beijersbergen et al.\n[CITE]. We demonstrate that the shapes of the LFs\nchange after deprojection. It is therefore e…
View article: Delaunay recovery of cosmic density and velocity probes
Delaunay recovery of cosmic density and velocity probes Open
Optimally resolved one-dimensional density and velocity profiles through cosmological N-body simulations are constructed by means of the Voronoi-Delaunay tessellation reconstruction technique. In a fully self-adaptive fashion a strikingly …
View article: Reconstructing cosmological fields using tessellation methods
Reconstructing cosmological fields using tessellation methods Open
Astronomical observations, physical experiments as well as computer simulations often involve discrete data sets supposed to represent a fair sample of an underlying smooth and continuous field. Reconstructing the underlying fields from a …
View article: Continuous Fields and Discrete Samples: Reconstruction through Delaunay Tessellations
Continuous Fields and Discrete Samples: Reconstruction through Delaunay Tessellations Open
Here we introduce the Delaunay Density Estimator Method. Its purpose is rendering a fully volume-covering reconstruction of a density field from a set of discrete data points sampling this field. Reconstructing density or intensity fields …
View article: Continuous Fields and Discrete Samples: Reconstruction through Delaunay Tessellations
Continuous Fields and Discrete Samples: Reconstruction through Delaunay Tessellations Open
Here we introduce the Delaunay Density Estimator Method. Its purpose is rendering a fully volume-covering reconstruction of a density field from a set of discrete data points sampling this field. Reconstructing density or intensity fields …
View article: The vertical extent and kinematics of the HI in NGC 2403
The vertical extent and kinematics of the HI in NGC 2403 Open
The neutral hydrogen line profiles along the major axis of the nearby spiral galaxy NGC 2403 show a wing towards the sytemic velocity. This asymmetry can be explained with the presence of an abnormally thick HI disk (FWHM ~ 5 kpc) or with …
View article: The vertical extent and kinematics of the HI in NGC 2403
The vertical extent and kinematics of the HI in NGC 2403 Open
The neutral hydrogen line profiles along the major axis of the nearby spiral galaxy NGC 2403 show a wing towards the sytemic velocity. This asymmetry can be explained with the presence of an abnormally thick HI disk (FWHM ~ 5 kpc) or with …