The Angular Momentum Problem in Cosmological Simulations of Disk Galaxy Formation (2009)
Piontek, Franziska, Steinmetz, Matthias
We conduct a systematic study of the angular momentum problem in numerical simulations of disk galaxy formation. We investigate the role of numerical resolution using a semi-cosmological setup which...
The Modelling of Feedback Processes in Cosmological Simulations of Disk Galaxy Formation (2009)
Piontek, Franziska, Steinmetz, Matthias
We present a systematic study of stellar feedback processes in simulations of disk galaxy formation. Using a dark matter halo with properties similar to the ones for the Milky Way's stellar halo, we...
Orbital Eccentricity as a probe of Thick Disk Formation Scenarios (2009)
Sales, Laura V., Helmi, Amina, Abadi, Mario G., Brook, Chris B., Gomez, Facundo A., Roskar, Rok, ...
We study the orbital properties of stars in four (published) simulations of thick disks formed by: i) accretion from disrupted satellites, ii) heating of a pre-existing thin disk by a minor merger,...
The Seventh Data Release of the Sloan Digital Sky Survey (2009)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Allende Prieto, Carlos, An, Deokkeun, ...
This paper describes the Seventh Data Release of the Sloan Digital Sky Survey (SDSS), marking the completion of the original goals of the SDSS and the end of the phase known as SDSS-II. It includes...
Galaxy-Induced Transformation of Dark Matter Halos (2009)
Abadi, Mario G., Navarro, Julio F., Fardal, Mark, Babul, Arif, Steinmetz, Matthias
We use N-body/gasdynamical LambdaCDM cosmological simulations to examine the effect of the assembly of a central galaxy on the shape and mass profile of its dark halo. Two series of simulations are...
The seventh data release of the sloan digital sky survey (2009)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Allende Prieto, Carlos, An, Deokkeun, ...
Die Welt im Großen beobachten und interpretieren (2009)
Studium Generale Wintersemester 2008/2009: Galileis erster Blick durchs Fernrohr und die Folgen heute, 19. Januar 2009 Prof. Matthias Steinmetz, Astrophysikalisches Institut, Potsdam
An Alternative Origin for Hypervelocity Stars (2008)
Abadi, Mario G., Navarro, Julio F., Steinmetz, Matthias
Halo stars with unusually high radial velocity ("hypervelocity" stars, or HVS) are thought to be stars unbound to the Milky Way that originate from the gravitational interaction of stellar systems...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Prieto, Carlos Allende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
Absorbers At High Redshift --- Large Disks Or Galactic Building Blocks? (2008)
Martin Haehnelt, Matthias Steinmetz, Michael Rauch
We investigate the nature of the physical structures giving rise to damped Lyff absorption systems (DLAS) at high redshift. In particular, we examine the suggestion that rapidly rotating large disks...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
The sixth data release of the sloan digital sky survey (2008)
Adelman-McCarthy, Jennifer K., Agüros, Marcel A., Allam, Sahar S., Allende Prieto, Carlos, Anderson, Kurt S. J., Anderson, Scott F., ...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
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 accretion origin of the Milky Way's stellar halo (2008)
Bell, Eric F., Zucker, Daniel B., Belokurov, Vasily, Sharma, Sanjib, Johnston, Kathryn V., Bullock, James S., ...
We have used data from the Sloan Digital Sky Survey (SDSS) Data Release 5 to explore the overall structure and substructure of the stellar halo of the Milky Way using ~4 million color-selected...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
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 Cosmological Origin of Disk Galaxy Scaling Laws (2007)
I discuss possible origins of scaling laws relating structural properties of disk galaxies within the context of hierarchically clustering theories of galaxy formation. In particular, I focus on the...
J.G. Funes, S.J., and E.M. Corsini, eds. Numerical Simulation of Galaxy Formation (2007)
Abstract. I review recent progress in numerically simulating the formation and evolution of galaxies in hierarchically clustering universes. Special emphasis is given to results based on high...
CIV Absorption From Galaxies in the Process of Formation (2007)
Martin Haehnelt, Matthias Steinmetz, Michael Rauch
We investigate the heavy element QSO absorption systems caused by gas condensations at high redshift which evolve into galaxies at the present epoch. Artificial QSO spectra were generated for a...
Photometric Evolution of Galaxies in Cosmological Scenarios (2007)
Gertrud Contardo, Matthias Steinmetz
The photometric evolution of galaxies in a hierarchically clustering universe is investigated. The study is based on high resolution numerical simulations which include the effects of gas dynamics,...
Numerical Simulations of Galaxy Formation (2007)
Matthias Steinmetz, Steward Observatory
. The current status of numerical simulations of galaxy formation is reviewed. After a short description of the main numerical simulation techniques, three sample applications illustrate how...
Probing the thermal history of the Intergalactic Medium with (2007)
Absorption Lines, Martin G. Haehnelt, Matthias Steinmetz
The Doppler parameter distribution of Lyff absorption is calculated for a set of different reionization histories. The differences in temperature between different reionization histories are as large...
A Comparison of X-ray and Strong Lensing Properties of Simulated X-ray Clusters (2007)
Matthias Bartelmann, Matthias Steinmetz
We use gas-dynamical simulations of galaxy clusters to compare their X-ray and strong lensing properties. Special emphasis is laid on mass estimates. The cluster masses range between 6 \Theta 10 14 M...
Michael Rauch, Martin G. Haehnelt, Matthias Steinmetz
In a hierarchical cosmogony galaxies build up by continuous merging of smaller structures. At redshift three the matter content of a typical present-day galaxy is dispersed over several individual...
The Hierarchical Origin of Galaxy Morphologies (2007)
I review recent progress in numerically simulating the formation and evolution of galaxies. Special emphasis is given to results based on high resolution gas dynamical simulations that incorporate...
Numerical Simulation of Galaxy Formation: The Properties of High Redshift Galaxies (2007)
I review recent progress in numerically simulating the formation and evolution of galaxies. Special emphasis is given to results based on high resolution gas dynamical simulations that incorporate...
The accretion origin of the Milky Way's stellar halo (2007)
Bell, Eric F., Zucker, Daniel B., Belokurov, Vasily, Sharma, Sanjib, Johnston, Kathryn V., Bullock, James S., ...
We have used data from the Sloan Digital Sky Survey (SDSS) Data Release 5 to explore the overall structure and substructure of the stellar halo of the Milky Way using about 4 million color-selected...
Wagner, Christian, Müller, Volker, Steinmetz, Matthias
The measurement of the scale of the baryon acoustic oscillations (BAO) in the galaxy power spectrum as a function of redshift is a promising method to constrain the equation-of-state parameter of the...
AstroGrid-D: Enhancing Astronomic Science with Grid Technology (2007)
Enke, Harry, Steinmetz, Matthias, Radke, Thomas, Reiser, Angelika, Röblitz, Thomas, Högqvist, Mikael
We present AstroGrid-D, a project bringing together astronomers and experts in Grid technology to enhance astronomic science in many aspects. First, by sharing currently dispersed resources,...
AstroGrid-D: Enhancing Astronomic Science with Grid Technology (2007)
Enke, Harry, Steinmetz, Matthias, Radke, Thomas, Reiser, Angelika, Röblitz, Thomas, Högqvist, Mikael
We present AstroGrid-D, a project bringing together astronomers and experts in Grid technology to enhance astronomic science in many aspects. First, by sharing currently dispersed resources,...
Cosmic ménage à trois: the origin of satellite galaxies on extreme orbits (2007)
Sales, Laura V., Navarro, Julio F., Abadi, Mario G., Steinmetz, Matthias
The dependence of the mass assembly history of cold dark matter halos on environment (2007)
Maulbetsch, Christian, Avila-Reese, Vladimir, Colín, Pedro, Gottlöber, Stefan, Khalatyan, Arman, Steinmetz, Matthias
We show by means of a high-resolution N-body simulation how the mass assembly histories of galaxy-sized cold dark matter (CDM) halos depend on environment. Halos in high-density environments form...
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,...
Multi-Dimensional Density Estimation and Phase Space Structure Of Dark Matter Halos (2005)
Sharma, Sanjib, Steinmetz, Matthias
We present a method to numerically estimate the densities of a discretely sampled data based on binary space partitioning tree. We start with a root node containing all the particles and then...
Stars beyond Galaxies: The Origin of Extended Luminous Halos around Galaxies (2005)
Abadi, Mario G., Navarro, Julio F., Steinmetz, Matthias
(Abridged) We use numerical simulations to investigate the origin and structure of the luminous halos that surround isolated galaxies. These stellar structures extend out to several hundred kpc away...
Internal Alignment of the Halos of Disk Galaxies in Cosmological Hydrodynamic Simulations (2005)
Bailin, Jeremy, Kawata, Daisuke, Gibson, Brad K., Steinmetz, Matthias, Navarro, Julio F., Brook, Chris B., ...
Seven cosmological hydrodynamic simulations of disk galaxy formation are analyzed to determine the alignment of the disk within the dark matter halo and the internal structure of the halo. We find...
Bailin, Jeremy, Power, Chris, Gibson, Brad K., Steinmetz, Matthias
We investigate whether a correlation exists between the concentration and spin parameters of dark matter haloes forming in LCDM N-body simulations. In particular, we focus on haloes with virial...
Internal alignment of the halos of disk galaxies in cosmological hydrodynamic simulations (2005)
Bailin, Jeremy, Kawata, Daisuke, Gibson, Brad K., Steinmetz, Matthias, Navarro, Julio F., Brook, Chris B., ...
Seven cosmological hydrodynamic simulations of disk galaxy formation are analyzed to determine the alignment of the disk within the dark matter halo and the internal structure of the halo. We find...
Internal and external alignment of the shapes and angular momenta of ΛCDM halos (2005)
Bailin, Jeremy, Steinmetz, Matthias
We investigate how the shapes and angular momenta of galaxy and group mass dark matter halos in a ΛCDM N-body simulation are correlated internally and how they are aligned with respect to the...
Internal alignment of the halos of disk galaxies in cosmological hydrodynamic simulations (2005)
Bailin, Jeremy, Kawata, Daisuke, Gibson, Brad K., Steinmetz, Matthias, Navarro, Julio F., Brook, Chris B., ...
Seven cosmological hydrodynamic simulations of disk galaxy formation are analyzed to determine the alignment of the disk within the dark matter halo and the internal structure of the halo. We find...
Internal and external alignment of the shapes and angular momenta of ΛCDM halos (2005)
Bailin, Jeremy, Steinmetz, Matthias
We investigate how the shapes and angular momenta of galaxy and group mass dark matter halos in a ΛCDM N-body simulation are correlated internally and how they are aligned with respect to the...
Internal alignment of the halos of disk galaxies in cosmological hydrodynamic simulations (2005)
Bailin, Jeremy, Kawata, Daisuke, Gibson, Brad K., Steinmetz, Matthias, Navarro, Julio F., Brook, Chris B., ...
Seven cosmological hydrodynamic simulations of disk galaxy formation are analyzed to determine the alignment of the disk within the dark matter halo and the internal structure of the halo. We find...
Internal and external alignment of the shapes and angular momenta of ΛCDM halos (2005)
Bailin, Jeremy, Steinmetz, Matthias
We investigate how the shapes and angular momenta of galaxy and group mass dark matter halos in a ΛCDM N-body simulation are correlated internally and how they are aligned with respect to the...
Internal and external alignment of the shapes and angular momenta of ΛCDM halos (2005)
Bailin, Jeremy, Steinmetz, Matthias
We investigate how the shapes and angular momenta of galaxy and group mass dark matter halos in a ΛCDM N-body simulation are correlated internally and how they are aligned with respect to the...
Internal alignment of the halos of disk galaxies in cosmological hydrodynamic simulations (2005)
Bailin, Jeremy, Kawata, Daisuke, Gibson, Brad K., Steinmetz, Matthias, Navarro, Julio F., Brook, Chris B., ...
Seven cosmological hydrodynamic simulations of disk galaxy formation are analyzed to determine the alignment of the disk within the dark matter halo and the internal structure of the halo. We find...
Internal alignment of the halos of disk galaxies in cosmological hydrodynamic simulations (2005)
Bailin, Jeremy, Kawata, Daisuke, Gibson, Brad K., Steinmetz, Matthias, Navarro, Julio F., Brook, Chris B., ...
Seven cosmological hydrodynamic simulations of disk galaxy formation are analyzed to determine the alignment of the disk within the dark matter halo and the internal structure of the halo. We find...
Internal and external alignment of the shapes and angular momenta of ΛCDM halos (2005)
Bailin, Jeremy, Steinmetz, Matthias
We investigate how the shapes and angular momenta of galaxy and group mass dark matter halos in a ΛCDM N-body simulation are correlated internally and how they are aligned with respect to the...
Accretion relicts in the solar neighbourhood: debris from omegaCen's parent galaxy (2004)
Meza, Andres, Navarro, Julio F., Abadi, Mario G., Steinmetz, Matthias
We use numerical simulations to investigate the orbital characteristics of tidal debris from satellites whose orbits are dragged into the plane of galactic disks by dynamical friction before...
Internal and External Alignment of the Shapes and Angular Momenta of LCDM Halos (2004)
Bailin, Jeremy, Steinmetz, Matthias
(Abridged) We investigate how the shapes and angular momenta of galaxy and group mass dark matter halos in a LCDM N-body simulation are correlated internally, and how they are aligned with respect to...
The Angular Momentum Distribution of Gas and Dark Matter in Galactic Halos (2004)
Sharma, Sanjib, Steinmetz, Matthias
(Abridged) We report results of a series of non radiative N-body/SPH simulations in a LCDM cosmology. We find that the spin of the baryonic component is on average larger than that of the dark matter...
Figure Rotation of Cosmological Dark Matter Halos (2004)
Bailin, Jeremy, Steinmetz, Matthias
We have analyzed galaxy and group-sized dark matter halos formed in a high resolution LCDM numerical N-body simulation in order to study the rotation of the triaxial figure, a property in principle...
Tidal Torques and the Orientation of Nearby Disk Galaxies (2004)
Navarro, Julio F., Abadi, Mario G., Steinmetz, Matthias
We use numerical simulations to investigate the orientation of the angular momentum axis of disk galaxies relative to their surrounding large scale structure. We find that this is closely related to...
Astronomical catalogues – simultaneous querying and matching (2004)
Adorf, Hans-Martin, Lemson, Gerard, Voges, Wolfgang, Enke, Harry, Steinmetz, Matthias
Coupling between satellite dwarfs and the Milky Way warp (2003)
Bailin, Jeremy, Steinmetz, Matthias
The perturbations of satellite galaxies, in particular the Large Magellanic Cloud (LMC), have been repeatedly proposed and discounted as the cause of the Milky Way warp. While the LMC may excite a...
On the nature of the ring-like structure in the outer Galactic disk (2003)
Helmi, Amina, Navarro, Julio F., Meza, Andres, Steinmetz, Matthias, Eke, Vincent R.
We examine the tidal disruption of satellite galaxies in a cosmological simulation of the formation of a disk galaxy in the $\Lambda$CDM scenario. We find that the disruption of satellite galaxies in...
Meza, Andres, Navarro, Julio F., Steinmetz, Matthias, Eke, Vincent R.
We examine in detail the dynamical structure of an elliptical galaxy simulated in the Lambda CDM scenario. The morphology of the galaxy evolves dramatically over time in response to the mode and...
Abadi, Mario G., Navarro, Julio F., Steinmetz, Matthias, Eke, Vincent R.
We present a detailed analysis of the dynamical properties of a simulated disk galaxy assembled hierarchically in the Lambda CDM cosmogony. At z=0, two distinct dynamical components are identified on...
RAVE: The RAdial Velocity Experiment (2002)
RAVE (RAdial Velocity Experiment) is an ambitious program to conduct an all-sky survey (complete to V = 16) to measure the radial velocities, metallicities and abundance ratios of 50 million stars...
Abadi, Mario G., Navarro, Julio F., Steinmetz, Matthias, Eke, Vincent R.
We analyze the properties of a disk galaxy simulated with unprecedented numerical resolution in the Lambda CDM cosmogony. The galaxy is assembled through a number of high-redshift mergers followed by...
Tidal Torques and Galactic Warps (2002)
Bailin, Jeremy, Steinmetz, Matthias
(Abridged) We investigate how galactic disks react to external tidal torques. We calculate the strength and radial dependence of torques on disks that arise from a misalignment between the disk and...
Galaxy Formation Now and Then (2002)
I review the current state of our understanding of the galaxy formation and evolution process from the modeler's perspective. With the advent of the cold dark matter model and the support of fast...
Numerical studies of galaxy formation using special purpose hardware (2002)
I review recent progress in numerically simulating the formation and evolution of galaxies in hierarchically clustering universes. Special emphasis is given to results based on high-resolution gas...
Dark Halo and Disk Galaxy Scaling Laws in Hierarchical Universes (2000)
Navarro, Julio F., Steinmetz, Matthias
We use cosmological N-body/gasdynamical simulations that include star formation and feedback to examine the proposal that scaling laws between the total luminosity, rotation speed, and angular...
Haehnelt, Martin G., Steinmetz, Matthias, Rauch, Michael
We combine predictions for several hierarchical cosmogonies with observational evidence on damped Lyman alpha systems to establish a correspondence between the high redshift galaxy population and the...
The Cosmological Origin of Disk Galaxy Scaling Laws (1999)
Steinmetz, Matthias, Navarro, Julio F.
We discuss possible origins of scaling laws relating structural properties of disk galaxies within the context of hierarchically clustering theories of galaxy formation. Using gasdynamical...
Numerical Simulations of Galaxy Formation (1999)
The current status of numerical simulations of galaxy formation is reviewed. After a short description of the main numerical simulation techniques, three sample applications illustrate how numerical...
The core density of dark matter halos: a critical challenge to the Lambda-CDM paradigm? (1999)
Navarro, Julio F., Steinmetz, Matthias
We compare the central mass concentration of Cold Dark Matter halos found in cosmological N-body simulations with constraints derived from the Milky Way disk dynamics and from the Tully-Fisher...
Dark Halo and Disk Galaxy Scaling Laws in Hierarchical Universes (1999)
Julio F. Navarro, Matthias Steinmetz
We use cosmological N-body/gasdynamical simulations that include star formation and feedback to examine the proposal that scaling laws between the total luminosity, rotation speed, and angular...
The cosmological origin of the Tully-Fisher relation (1998)
Steinmetz, Matthias, Navarro, Julio
We use high-resolution cosmological simulations that include the effects of gasdynamics and star formation to investigate the origin of the Tully-Fisher relation in the standard Cold Dark Matter...
How universal are the density profiles of dark halos? (1998)
Huss, Andreas, Jain, Bhuvnesh, Steinmetz, Matthias
We investigate the formation of virialized halos due to the gravitational collapse of collisionless matter using high-resolution N-body simulations. A variety of formation scenarios are studied,...
Photometric Evolution of Galaxies in Cosmological Scenarios (1998)
Contardo, Gertrud, Steinmetz, Matthias, Alvensleben, Uta Fritze-von
The photometric evolution of galaxies in a hierarchically clustering universe is investigated. The study is based on high resolution numerical simulations which include the effects of gas dynamics,...
Model Predictions for Clustering and Morphologies at HDF depths (1998)
The current status of numerical simulations of the formation of galaxies is reviewed. Success and failure of modeling galaxies at low and high redshift is demonstrated using a variety of examples,...
The relation between QSO absorption systems and high redshift galaxies (1997)
The relation between high redshift galaxies and QSO absorption systems is discussed in the context of hierarchical galaxy formation. It is demonstrated that imprints of the reionization history of...
Probing the thermal history of the Intergalactic Medium with Lyman-alpha absorption lines (1997)
Haehnelt, Martin G., Steinmetz, Matthias
The Doppler parameter distribution of Lyman-alpha absorption is calculated for a set of different reionization histories. The differences in temperature between different reionization histories are...
Damped Lyman alpha absorbers at high redshift -- large disks or galactic building blocks? (1997)
Haehnelt, Martin G., Steinmetz, Matthias, Rauch, Michael
We investigate the nature of the physical structures giving rise to damped Lyman alpha absorption systems (DLAS) at high redshift. In particular, we examine the suggestion that rapidly rotating large...
Energy Input and Mass Redistribution by Supernovae in the Interstellar Medium (1997)
Thornton, Katsuyo, Gaudlitz, Michael, Janka, Hans-Thomas, Steinmetz, Matthias
We present the results of numerical studies of supernova remnant evolution and their effects on galactic and globular cluster evolution. We show that parameters such as the density and the...
Rauch, Michael, Haehnelt, Martin G., Steinmetz, Matthias
In hierarchical cosmogonies at redshift three the matter content of a typical present-day galaxy is dispersed over several individual clumps embedded in sheet-like structures, often aligned along...
Two--body heating in numerical galaxy formation experiments (1996)
Steinmetz, Matthias, White, Simon D. M.
We show that discreteness effects related to classical two-body relaxation produce spurious heating of the gaseous component in numerical simulations of galaxy formation. A simple analytic model...
Non-equilibrium effects on line-of-sight size estimates of QSO absorption systems (1996)
Haehnelt, Martin G., Rauch, Michael, Steinmetz, Matthias
Estimates of the linear extent of heavy-element absorption systems along the line-of-sight to a QSO often assume that the cloud is photoionized and that the temperature takes the equilibrium value...
Numerical Simulations of Galaxy Formation (1996)
An overview over the current status of modeling galaxies by means of numerical simulations is given. After a short description of how galaxies form in hierarchically clustering scenarios, success and...
The Effects of a Photoionizing UV Background on the Formation of Disk Galaxies (1996)
Navarro, Julio, Steinmetz, Matthias
We use high resolution N-body/gasdynamical simulations to investigate the effects of a photoionizing UV background on the assembly of disk galaxies in hierarchically clustering universes. We focus on...
A Comparison of X-ray and Strong Lensing Properties of Simulated X-ray Clusters (1996)
Bartelmann, Matthias, Steinmetz, Matthias
We use gas-dynamical simulations of galaxy clusters to compare their X-ray and strong lensing properties. Special emphasis is laid on mass estimates. The cluster masses range between 6 x 10^14 solar...
CIV Absorption From Galaxies in the Process of Formation (1995)
Haehnelt, Martin, Steinmetz, Matthias, Rauch, Michael
We investigate the heavy element QSO absorption systems caused by gas condensations at high redshift which evolve into galaxies with circular velocity of 100 to 200 km/s at the present epoch....
Galaxy Formation and Large-Scale Bias (1995)
Kauffmann, Guinevere, Nusser, Adi, Steinmetz, Matthias
We outline a simple approach to understanding the physical origin of bias in the distribution of galaxies relative to that of dark matter. The first step is to specify how collapsed, virialized halos...
Simulating Galaxy Formation (1995)
A review on numerical simulations of galaxy formation is given. Different numerical methods to solve collisionless and gas dynamical systems are outlined and one particular simulation technique,...
Mergers and the Formation of Disk Galaxies in Hierarchically Clustering Universes (1995)
New simulations are presented which investigate the formation of smaller groups of galaxies in a CDM like universe. The simulations follow the evolution of dark matter and gas and are performed with...
GRAPESPH: Cosmological SPH simulations with the special purpose hardware GRAPE (1995)
A combined N--body/SPH code is presented which benefits from the high speed of the special purpose hardware GRAPE (GRAvity PipE). Besides gravitational forces, GRAPE also returns the list of...
Photoionization Effects During Galaxy Formation (1995)
SPH hydrodynamical simulations of the formation of galaxies are presented including the effects of an UV background radiation field. Based on a talk presented at the 17th Texas Symposium on...
Bartelmann, Matthias, Steinmetz, Matthias, Weiss, Achim
We construct a sample of numerical models for clusters of galaxies and employ these to investigate their capability of imaging background sources into long arcs. Emphasis is laid on the statistics of...
The Formation of Disk Galaxies in a Cosmological Context: Structure and Kinematics (1994)
Steinmetz, Matthias, Mueller, Ewald
We present results concerning the internal structure and kinematics of disk galaxies formed in cosmologically motivated simulations. The calculations include dark matter, gas dynamics, radiative...
On the spin parameter of dark-matter haloes (1994)
Steinmetz, Matthias, Bartelmann, Matthias
The study by White (1984) on the growth of angular momentum in dark haloes is extended towards a more detailed investigation of the spin parameter $\lambda\equiv L\sqrt{E}/{G M^{2.5}}$. Starting from...
Simulating Self-gravitating Hydrodynamic Flows (1994)
Mueller, Ewald, Steinmetz, Matthias
An efficient algorithm for solving Poisson's equation in two and three spatial dimensions is discussed. The algorithm, which is described in detail, is based on the integral form of Poisson's...
The Formation of Galaxies: A Challenge for Supercomputers -- a Simple Task for GRAPE ? (1994)
We present numerical simulations of galaxy formation, one of the most challenging problems in computational astrophysics. The key point in such simulations is the efficient solution of the N--body...
Steinmetz, Matthias, Mueller, Ewald
We present first results concerning the metallicities and stellar populations of galaxies formed in a cosmologically motivated simulation. The calculations include dark matter, gas dynamics,...
Formation of spiral and elliptical galaxies in a CDM cosmogony (1993)
Steinmetz, Matthias, Mueller, Ewald
The formation of galaxies in a CDM cosmogony is investigated by following the evolution of dark and baryonic matter and of the frequency- dependent spatially averaged radiation field. The gas is...