Tailoring triaxial N-body models via a novel made-to-measure method (2009)
The made-to-measure N-body method (Syer & Tremaine 1996) slowly adapts the particle weights of an N-body model, whilst integrating the trajectories in an assumed static potential, until some...
The radial velocity experiment (rave): second data release (2008)
Zwitter, Tomaz, Siebert, Arnaud, Munari, Ulisse, Freeman, Kenneth C., Siviero, Alessandro, Watson, Fred G., ...
We present the second data release of the Radial Velocity Experiment (RAVE), an ambitious spectroscopic survey to measure radial velocities and stellar atmosphere parameters (temperature,...
The radial velocity experiment (RAVE): second data release (2008)
Zwitter, Tomaz, Siebert, Arnaud, Munari, Ulisse, Freeman, Kenneth C., Siviero, Alessandro, Watson, Fred G., ...
We present the second data release of the Radial Velocity Experiment (RAVE), an ambitious spectroscopic survey to measure radial velocities and stellar atmosphere parameters (temperature,...
Initial conditions for disc galaxies (2007)
McMillan, Paul J., Dehnen, Walter
We present a general recipe for constructing N-body realizations of galaxies comprised of near-spherical and disc components. First, an exact spherical distribution function for the spheroids (halo &...
The velocity dispersion and mass profile of the Milky Way (2006)
Dehnen, Walter, McLaughlin, Dean, Sachania, Jalpesh
We re-analyse the velocity-dispersion profile sigma(r) at radii r>10 kpc in the Galactic stellar halo, recently derived by Battaglia et al. (2005), who concluded that, for constant velocity...
Weighing the young stellar discs around Sgr A* (2006)
Nayakshin, Sergei, Dehnen, Walter, Cuadra, Jorge, Genzel, Reinhard
Weighing the young stellar discs around Sgr A* (2006)
Nayakshin, Sergei, Dehnen, Walter, Cuadra, Jorge, Genzel, Reinhard
The radial velocity experiment (RAVE) : first data release (2006)
Steinmetz, Matthias, Zwitter, Tomaz, Siebert, Arnaud, Watson, Fred G., Freeman, Kenneth C., Munari, Ulisse, ...
We present the first data release of the Radial Velocity Experiment (RAVE), an ambitious spectroscopic survey to measure radial velocities and stellar atmosphere parameters (temperature, metallicity,...
The radial velocity experiment (RAVE) : first data release (2006)
Steinmetz, Matthias, Zwitter, Tomaz, Siebert, Arnaud, Watson, Fred G., Freeman, Kenneth C., Munari, Ulisse, ...
We present the first data release of the Radial Velocity Experiment (RAVE), an ambitious spectroscopic survey to measure radial velocities and stellar atmosphere parameters (temperature, metallicity,...
The radial velocity experiment (RAVE) : first data release (2006)
Steinmetz, Matthias, Zwitter, Tomaz, Siebert, Arnaud, Watson, Fred G., Freeman, Kenneth C., Munari, Ulisse, ...
We present the first data release of the Radial Velocity Experiment (RAVE), an ambitious spectroscopic survey to measure radial velocities and stellar atmosphere parameters (temperature, metallicity,...
The radial velocity experiment (RAVE) : first data release (2006)
Steinmetz, Matthias, Zwitter, Tomaz, Siebert, Arnaud, Watson, Fred G., Freeman, Kenneth C., Munari, Ulisse, ...
We present the first data release of the Radial Velocity Experiment (RAVE), an ambitious spectroscopic survey to measure radial velocities and stellar atmosphere parameters (temperature, metallicity,...
The radial velocity experiment (RAVE) : first data release (2006)
Steinmetz, Matthias, Zwitter, Tomaz, Siebert, Arnaud, Watson, Fred G., Freeman, Kenneth C., Munari, Ulisse, ...
We present the first data release of the Radial Velocity Experiment (RAVE), an ambitious spectroscopic survey to measure radial velocities and stellar atmosphere parameters (temperature, metallicity,...
Probing dark matter with X-ray binaries (2005)
Low-mass X-ray binaries (LMXBs), which occur in old stellar populations, have velocities exceeding those of their parent distribution by at least 20 km/s. This makes them ideal probes for dark...
Weighing the young stellar discs around Sgr A* (2005)
Nayakshin, Sergei, Dehnen, Walter, Cuadra, Jorge, Genzel, Reinhard
It is believed that young massive stars orbiting Sgr A* in two stellar discs on scales of 0.1-0.2 parsecs were formed either farther out in the Galaxy and then quickly migrated inward, or in situ in...
Halo evolution in the presence of a disc bar (2005)
McMillan, Paul J., Dehnen, Walter
Angular momentum transfer from a rotating stellar bar has been proposed by Weinberg & Katz (2002) as a mechanism to destroy dark-matter cusps in a few rotation periods. The N-body simulations...
Dynamical insight into dark-matter haloes (2005)
Dehnen, Walter, McLaughlin, Dean
We investigate, using the spherical Jeans equation, self-gravitating dynamical equilibria satisfying a relation rho/sigma_r^3 propto r^-alpha, which holds for simulated dark-matter haloes over their...
Phase-space mixing and the merging of cusps (2005)
Collisionless stellar systems are driven towards equilibrium by mixing of phase-space elements. I show that the excess-mass function D(f)= int_{F(x,v)>f} (F(x,v)-f) d^3x d^3v (with F(x,v) the...
Hierarchical Merging, Ultraluminous and Hyperluminous X-ray Sources (2004)
King, Andrew R., Dehnen, Walter
Various arguments strongly suggest that the population of ultraluminous X-ray sources (ULXs: apparent X-ray luminosity > Eddington limit for 10 Msun ~10^39 erg/s) in nearby galaxies are mostly...
Modeling the disruption of the globular cluster Palomar 5 by galactic tides (2004)
Dehnen, Walter, Odenkirchen, Michael, Grebel, Eva K., Rix, Hans-Walter
The globular cluster Palomar 5 is remarkable not only because of its extended massive tidal tails, but also for its very low mass and velocity dispersion, and its size, which is much larger than its...
Kinematic study of the tidal tails of Palomar 5 (2004)
Kayser, Andrea, Grebel, Eva K., Odenkirchen, Michael, Dehnen, Walter, Rix, Hans-Walter
Not Available
Kinematic response of the outer stellar disk to a central bar (2003)
M"uhlbauer, Gerhard, Dehnen, Walter
We study, using direct orbit integrations, the kinematic response of the outer stellar disk to the presence of a central bar, as in the Milky-Way. We find that the bar's outer Lindblad resonance...
The Oort Constants Measured from Proper Motions (2003)
Olling, Rob P., Dehnen, Walter
The Oort constants describe the local variations of the stellar streaming field. Classically, they are determined from stellar proper motions. We discuss problems arising in this procedure. A large,...
The Extended Tidal Tails of Palomar 5: Tracers of the Galactic Potential (2003)
Odenkirchen, Michael, Grebel, Eva K., Rix, Hans-Walter, Dehnen, Walter, Newberg, Heidi Jo, Rockosi, Constance M., ...
We detected extended, curved stellar tidal tails emanating from the sparse, disrupting halo globular cluster Pal 5, which cover 10 degrees on the sky. These streams allow us to infer the orbit of Pal...
The extended tails of palomar 5: A 10° arc of globular cluster tidal debris (2003)
Odenkirchen, Michael, Grebel, Eva K., Dehnen, Walter, Rix, Hans-Walter, Yanny, Brian, Newberg, Heidi Jo, ...
Using wide-field photometric data from the Sloan Digital Sky Survey (SDSS), we recently showed that the Galactic globular cluster Palomar 5 is in the process of being tidally disrupted. Its tidal...
Kinematic study of the disrupting globular cluster Palomar 5 using VLT spectra (2002)
Odenkirchen, Michael, Grebel, Eva K., Dehnen, Walter, Rix, Hans-Walter, Cudworth, Kyle M.
Wide-field photometric data from the Sloan Digital Sky Survey have recently revealed that the Galactic globular cluster Palomar 5 is in the process of being tidally disrupted (Odenkirchen et al....
A Hierarchical O(N) Force Calculation Algorithm (2002)
A novel code for the approximate computation of long-range forces between N mutually interacting bodies is presented. The code is based on a hierarchical tree of cubic cells and features mutual...
Sloan Digital Sky Survey: Early data release (2002)
Stoughton, Chirs, Lupton, Rpbert H., Bernardi, Mariangela, Blanton, Michael R., Burles, Scott, Castander, Francsico J., ...
The Sloan Digital Sky Survey (SDSS) is an imaging and spectroscopic survey that will eventually cover approximately one-quarter of the celestial sphere and collect spectra of 10 6 galaxies, 100,000...
Sloan Digital Sky Survey: Early Data Release (2002)
Stoughton, Chris, Lupton, Robert H., Bernardi, Mariangela, Blanton, Michael R., Burles, Scott, Castander, Francisco J., ...
A Matched-Filter Analysis of the Tidal Tails of the Globular Cluster Palomar 5 (2002)
Rockosi, Constance M., Odenkirchen, Michael, Grebel, Eva K., Dehnen, Walter, Cudworth, Kyle M., Gunn, James E., ...
Kinematic Study of the Disrupting Globular Cluster Palomar 5 Using VLT Spectra (2002)
Odenkirchen, Michael, Grebel, Eva K., Dehnen, Walter, Rix, Hans-Walter, Cudworth, Kyle M.
Newberg, Heidi Jo, Yanny, Brian, Rockosi, Connie, Grebel, Eva K., Rix, Hans-Walter, Brinkmann, Jon, ...
Sloan Digital Sky Survey: early data release (2002)
Stoughton, Chris, Lupton, Robert H., Bernardi, Mariangela, Blanton, Michael R., Burles, Scott M., Castander, Francisco J., ...
The Sloan Digital Sky Survey (SDSS) is an imaging and spectroscopic survey that will eventually cover approximately one-quarter of the celestial sphere and collect spectra of ≈ 106 galaxies,...
Sloan Digital Sky Survey: early data release (2002)
Stoughton, Chris, Lupton, Robert H., Bernardi, Mariangela, Blanton, Michael R., Burles, Scott M., Castander, Francisco J., ...
The Sloan Digital Sky Survey (SDSS) is an imaging and spectroscopic survey that will eventually cover approximately one-quarter of the celestial sphere and collect spectra of ≈ 106 galaxies,...
Odenkirchen, Michael, Grebel, Eva K., Harbeck, Daniel, Dehnen, Walter, Rix, Hans-Walter
We have investigated the spatial extent and structure of the Draco dwarf spheroidal galaxy using deep wide-field multicolor CCD photometry from the Sloan Digital Sky Survey (SDSS). Our study covers...
Towards optimal softening in 3D N-body codes: I. Minimizing the force error (2000)
In N-body simulations of collisionless stellar systems, the forces are softened to reduce the shot noise. Softening modifies gravity at r=|x-y| smaller than softening length epsilon and the softened...
The Age of the Solar Neighbourhood (2000)
Binney, James, Dehnen, Walter, Bertelli, Gianpaolo
High-quality Hipparcos data for a complete sample of nearly 12000 main-sequence and subgiant stars, together with Padua isochrones, are used to constrain the star-formation history of the solar...
A Very Fast and Momentum-Conserving Tree Code (2000)
The tree code for the approximate evaluation of gravitational forces is extended and substantially accelerated by including mutual cell-cell interactions. These are computed by a Taylor series in...
Hydro-dynamical modeling of the inner Galaxy suggest that the radius of the outer Lindblad resonance (OLR) of the Galactic bar lies in the vicinity of the Sun. How does this resonance affect the...
The Pattern Speed of the Galactic Bar (1999)
Most late-type stars in the solar neighborhood have velocities similar to the local standard of rest (LSR), but there is a clearly separated secondary component corresponding to a slower rotation and...
Approximating Stellar Orbits: Improving on Epicycle Theory (1999)
Already slightly eccentric orbits, such as those occupied by many old stars in the Galactic disk, are not well approximated by Lindblad's epicycle theory. Here, alternative approximations for flat...
Simple Distribution Functions for Stellar Disks (1999)
Distribution functions (DFs) for dynamically warm thin stellar disks residing in arbitrary axisymmetric potentials are presented which approximately reproduce pre-described surface-density and...
A Dynamical Model of the Inner Galaxy (1999)
Hafner, Ralf M., Evans, N. Wyn, Dehnen, Walter, Binney, James
An extension of Schwarzschild's galaxy-building technique is presented that, for the first time, enables one to build Schwarzschild models with known distribution functions (DFs). The new extension...
A Dynamical Model of the Inner Galaxy (1999)
Ralf Häfner, N. Wyn Evans, Walter Dehnen, James Binney
An extension of Schwarzschild's (1979) galaxy-building technique is presented that, for the first time, enables one to build Schwarzschild models with known distribution functions (DFs). The new...
The Distribution of Nearby Stars in Velocity Space (1998)
From the tangential velocities of stars all over the sky, one can, in a statistical way, infer their 3D velocity distribution. An application to Hipparcos data reveals rich structure in the planar...
The Distribution of Nearby Stars in Velocity Space Inferred from Hipparcos Data (1998)
(abridged) The velocity distribution f(v) of nearby stars is estimated, via a maximum- likelihood algorithm, from the positions and tangential velocities of a kinematically unbiased sample of 14369...
I review recent studies about the gravitational potential and stellar dynamics of M87 in particular, and the dynamics of the stars in the presence of a super-massive central black hole, in general....
Local stellar kinematics from Hipparcos data (1997)
(shortened) From a kinematically unbiased subsample of the Hipparcos catalogue we have redetermined as a function of colour the kinematics of main-sequence stars. The stars' mean heliocentric...
The outer rotation curve of the Milky Way (1996)
A straightforward determination of the circular-speed curve vc(R) of the Milky Way suggests that near the Sun, vc starts to rise approximately linearly with R. If this result were correct, the...
Mass models of the Milky Way (1996)
A parameterized model of the mass distribution within the Milky Way is fitted to the available observational constraints. The most important single parameter is the ratio of the scale length R_d* of...
Dynamical Models for the Milky Way (1996)
The only way to map the Galaxy's gravitational potential $\Phi({\bf x})$ and the distribution of matter that produces it is by modelling the dynamics of stars and gas. Observations of the kinematics...
Modelling Galaxies with f(E,Lz); a Black Hole in M32 (1994)
A technique for the construction of axisymmetric distribution functions for individual galaxies is presented. It starts from the observed surface bright- ness distribution, which is deprojected to...
Dynamische Modelle für Elliptische Galaxien / (1994)
Heidelberg, Universiẗat, Diss., 1994.
Kouros, Mohammad, Mönch, Wolfgang, Reiffer, Franz Josef, Dehnen, Walter
Alcohol appears to be a predisposing factor for the high incidence of oesophageal cancer in Western France. Therefore, we have investigated the influence of ethanol on the alkylation of DNA by a...
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Aus: Fortschritte d. Neurologie, Psychiatrie u. ihrer Grenzgebiete. Jg. 29. 1961, H. 7