Publications (29)
Metal enrichment of the intra-cluster medium over a Hubble time for merging and relaxed galaxy clusters
W. Kapferer, T. Kronberger, J. Weratschnig +6
We investigate the efficiency of galactic mass loss, triggered by ram-pressure stripping and galactic winds of cluster galaxies, on the chemical enrichment of the intra-cluster med…
Metal Enrichment of the Intra-Cluster Medium: Ram-Pressure Stripping of Cluster Galaxies
W. Domainko, W. Kapferer, S. Schindler +4
We present numerical simulations of the dynamical and chemical evolution of galaxy clusters. X-ray spectra show that the intra-cluster medium contains a significant amount of metal…
Three-Dimensional Hydrodynamic Bondi-Hoyle Accretion. V. Specific Heat Ratio 1.01, Nearly Isothermal Flow
M. Ruffert
We investigate the hydrodynamics of three-dimensional classical Bondi-Hoyle accretion. A totally absorbing sphere of different sizes (1, 0.1 and 0.02 accretion radii) moves at diff…
Metal enrichment of the intra-cluster medium by thermally and cosmic-ray driven galactic winds
W. Kapferer, T. Kronberger, D. Breitschwerdt +6
We investigate the efficiency and time-dependence of thermally and cosmic ray driven galactic winds for the metal enrichment of the intra-cluster medium (ICM) using a new analytica…
r-Process Nucleosynthesis in Hot Accretion Disk Flows from Black Hole - Neutron Star Mergers
R. Surman, G. C. McLaughlin, M. Ruffert +2
We consider hot accretion disk outflows from black hole - neutron star mergers in the context of the nucleosynthesis they produce. We begin with a three dimensional numerical model…
Polytropic neutron star - black hole merger simulations with a Paczynski-Wiita potential
M. Ruffert, H. -Th. Janka
Context: Mergers of neutron stars (NS) and black holes (BH) are among the strongest sources of gravitational waves and are potential central engines for short gamma-ray bursts. Aim…
A fresh look at the unstable simulations of Bondi-Hoyle-Lyttleton accretion
T. Foglizzo, P. Galletti, M. Ruffert
The instability of Bondi-Hoyle-Lyttleton accretion, observed in numerical simulations, is analyzed through known physical mechanisms and possible numerical artefacts. The mechanism…
Coalescing Neutron Stars -- a Step Towards Physical Models. I. Hydrodynamic Evolution and Gravitational-Wave Emission
M. Ruffert, H. -Th. Janka, G. Schaefer
We investigate the dynamics and evolution of coalescing neutron stars. Although the code (Piecewise Parabolic Method) is purely Newtonian, we do include the emission of gravitation…
An analytic study of Bondi-Hoyle-Lyttleton accretion
T. Foglizzo, M. Ruffert
The adiabatic shock produced by a compact object moving supersonically relative to a gas with uniform entropy and no vorticity is a source of entropy gradients and vorticity. We in…
Black Hole - Neutron Star Mergers as Central Engines of Gamma-Ray Bursts
H. -Th. Janka, Th. Eberl, M. Ruffert +1
Hydrodynamic simulations of the merger of stellar mass black hole - neutron star binaries (BH/NS) are compared with mergers of binary neutron stars (NS/NS). The simulations are New…
Can neutrinos from neutron star mergers power gamma-ray bursts?
H. -Th. Janka, M. Ruffert
We perform three-dimensional hydrodynamical simulations of the coalescence of binary neutron stars. We include the emission and backreaction of gravitational waves into the Newtoni…
Merging Neutron Stars and Black Holes as Sources of Gamma-Ray Bursts and Heavy Elements
H. -Th. Janka, M. Ruffert, T. Eberl
Hydrodynamic simulations were performed of the dynamical phase of the merging of binary neutron stars (NS-NS) and of neutron star black hole binaries (NS-BH), using the physical nu…
Non-axisymmetric wind-accretion simulations. II. Density gradients
M. Ruffert
The hydrodynamics of a variant of classical Bondi-Hoyle-Lyttleton accretion is investigated: a totally absorbing sphere moves at various Mach numbers (3 and 10) relative to a mediu…
Detectable Signals from Mergers of Compact Stars
H. -Th. Janka, M. Ruffert
Merging neutron stars and neutron star-black holes binaries are powerful sources of gravitational waves. They have also been suggested as possible sources of cosmic gamma-ray burst…
Simulations of non-axisymmetric rotational core collapse
M. Rampp, E. Mueller, M. Ruffert
We report on the first three-dimensional hydrodynamic simulations of secular and dynamical non-axisymmetric instabilities in collapsing, rapidly rotating stellar cores which extend…
Metal Enrichment Processes in the Intra-Cluster Medium
S. Schindler, W. Kapferer, W. Domainko +7
We present numerical simulations of galaxy clusters which include interaction processes between the galaxies and the intra-cluster gas. The considered interaction processes are gal…
Coalescing neutron stars - a step towards physical models III. Improved numerics and different neutron star masses and spins
M. Ruffert, H. -Th. Janka
(Abridged) In this paper we present a compilation of results from our most advanced neutron star merger simulations, including a description of the employed numerical procedures an…
Enrichment of the ICM of galaxy clusters due to ram-pressure stripping
W. Domainko, M. Mair, W. Kapferer +6
We investigate the impact of galactic mass loss triggered by ram-pressure stripping of cluster galaxies on the evolution of the intra-cluster medium (ICM). We use combined N-body a…
Long-term remnant evolution of compact binary mergers
W. Domainko, M. Ruffert
We investigate the long-term evolution and observability of remnants originating from the merger of compact binary systems and discuss the differences to supernova remnants. Compac…
Coalescing neutron stars -- a step towards physical models. II. Neutrino emission, neutron tori, and gamma-ray bursts
M. Ruffert, H. -Th. Janka, K. Takahashi +1
Three-dimensional hydrodynamical, Newtonian calculations of the coalescence of equal-mass binary neutron stars are performed, including a physical high-density equation of state an…
THREE-DIMENSIONAL HYDRODYNAMIC BONDI-HOYLE ACCRETION. IV. SPECIFIC HEAT RATIO 4/3.
M. Ruffert
We investigate the hydrodynamics of three-dimensional classical Bondi-Hoyle accretion. A totally absorbing sphere of different sizes (1, 0.1 and 0.02 accretion radii) exerts gravit…
Three-dimensional simulations of non-stationary accretion by remnant black holes of compact object mergers
S. Setiawan, M. Ruffert, H. -Th. Janka
(abridged) Three-dimensional hydrodynamic simulations with an Eulerian PPM code are presented for the time-dependent evolution of accretion tori around nonrotating and rotating ste…
Simulations of Metal Enrichment in Galaxy Clusters by AGN Outflows
R. Moll, S. Schindler, W. Domainko +6
We assess the importance of AGN outflows with respect to the metal enrichment of the intracluster medium (ICM) in galaxy clusters. We use combined N-body and hydrodynamic simulatio…
Coalescing neutron stars -- gravitational waves from polytropic models
M. Ruffert, M. Rampp, H. -Th. Janka
The dynamics, time evolution of the mass distribution, and gravitational wave signature of coalescing neutron stars described by polytropes are compared with three simulations publ…
Non-stationary hyperaccretion of stellar-mass black holes in three dimensions: Torus evolution and neutrino emission
S. Setiawan, M. Ruffert, H. -Th. Janka
We present three-dimensional hydrodynamic simulations of the evolution of selfgravitating, thick accretion discs around hyperaccreting stellar-mass black holes. The black hole-toru…
Simulations of galactic winds and starbursts in galaxy clusters
W. Kapferer, C. Ferrari, W. Domainko +7
We present an investigation of the metal enrichment of the intra-cluster medium (ICM) by galactic winds and merger-driven starbursts. We use combined N-body/hydrodynamic simulation…
Remnants of compact binary mergers
W. Domainko, M. Ruffert
We investigate the long-term evolution and observability of remnants originating from the merger of compact binary systems and discuss the differences to supernova remnants. Compac…
Gamma-ray bursts from accreting black holes in neutron star mergers
M. Ruffert, H. -Th. Janka
By means of three-dimensional hydrodynamic simulations with a Eulerian PPM code we investigate the formation and the properties of the accretion torus around the stellar mass black…
COALESCING NEUTRON STARS AS GAMMA RAY BURSTERS ?
M. Ruffert, H. -Th. Janka, W. Keil +1
We investigate the dynamics and evolution of coalescing neutron stars. The three-dimensional Newtonian equations of hydrodynamics are integrated by the `Piecewise Parabolic Method'…