The First Generation of Virgo Cluster Dwarf Elliptical Galaxies? (2009)
Lisker, T., Janz, J., Hensler, G., Kim, S., Rey, S. -C., Weinmann, S., ...
In the light of the question whether most early-type dwarf (dE) galaxies in clusters formed through infall and transformation of late-type progenitors, we search for an imprint of such an infall...
The effect of clouds on the dynamical and chemical evolution of gas-rich dwarf galaxies (2009)
We study the effects of clouds on the dynamical and chemical evolution of gas-rich dwarf galaxies, in particular focusing on two model galaxies similar to IZw18 and NGC1569. We consider both...
The first generation of Virgo cluster dwarf elliptical galaxies? (2009)
Lisker, T., Janz, J., Hensler, G., Kim, S., Rey, S.C., Weinmann, S., ...
Original article can be found at: http://www.iop.org/EJ/journal/apjl Copyright American Astronomical Society DOI: 10.1088/0004-637X/706/1/L124 [Full text of this article is not available in the UHRA]
The role of the Rayleigh-Taylor instability in ram pressure stripped disk galaxies (2008)
Ram pressure stripping, i.e. the removal of a galaxy's gas disk due to its motion through the intracluster medium of a galaxy cluster, appears to be a common phenomenon. Not every galaxy, however, is...
ROSAT X-RAY OBSERVATIONS OF CENTRAL GALACTIC STARBURSTS (2007)
Presentamos observaciones espectroscopicas de las galaxias NGC 4569 and NGC 4303 hechas con ROSAT. Ambos objetos son miembros del cumulo de Virgo y tienen compa~neras cercanas mas peque~nas con...
ROSAT X-RAY OBSERVATIONS OF CENTRAL GALACTIC STARBURSTS (2007)
Presentamos observaciones espectroscópicas de las galaxias NGC 4569 and NGC 4303 hechas con ROSAT. Ambos objetos son miembros del cúmulo de Virgo y tienen compañeras cercanas más pequeñas con...
The effect of clouds in a galactic wind on the evolution of gas-rich dwarf galaxies (2007)
(Abridged) We study the effects of interstellar clouds on the dynamical and chemical evolution of gas-rich dwarf galaxies. In particular, we focus on two model galaxies similar to IZw18 and NGC1569...
Shortened version: The fate of IS clouds embedded in a hot tenuous medium depends on whether the clouds suffer from evaporation or whether material condensates onto them. Analytical solutions for the...
The early evolution of tidal dwarf galaxies (2007)
Recchi, S., Theis, Ch., Kroupa, P., Hensler, G.
Context: Dwarf galaxies can arise from self-gravitating structures emerging from tidal tails. What fraction of the known dwarf galaxies in the Local Universe can have this origin is still a matter of...
The evolution of interstellar clouds in a streaming hot plasma including heat conduction (2007)
To examine the evolution of giant molecular clouds in the stream of a hot plasma we performed two-dimensional hydrodynamical simulations that take full account of self-gravity, heating and cooling...
Star Formation Regulation, Gas cycles and the Chemical Evolution of Dwarf Irregular Galaxies (2006)
Due to their low gravitational energies, dwarf galaxies are greatly exposed to energetical influences from internal and external sources. By means of chemodynamical models we show that their star...
Early evolution of Tidal Dwarf Galaxies (2006)
Recchi, S., Kroupa, P., Theis, Ch., Hensler, G.
Our aim is to study the evolution of tidal dwarf galaxies. The first step is to understand whether a model galaxy without Dark Matter can sustain the feedback of the ongoing star formation. We...
Rosat x-ray observations of central galactic starbursts (2006)
Rosat x-ray observations of central galactic starbursts
Dynamical and chemical evolution of NGC1569 (2005)
Recchi, S., Hensler, G., Angeretti, L., Matteucci, F.
Blue Compact Dwarf and Dwarf Irregular galaxies are generally believed to be unevolved objects, due to their blue colors, compact appearance and large gas fractions. Many of these objects show an...
Effects of episodic gas infall on the chemical abundances in galaxies (2005)
The chemical evolution of galaxies that undergo an episode of massive and rapid accretion of metal-poor gas is investigated with models using both simplified and detailed nucleosynthesis recipes. The...
Ram pressure stripping of disk galaxies (2004)
(Abridged) We perform high resolution 2D hydrodynamical simulations of face-on ram pressure stripping (RPS) of disk galaxies to compile a comprehensive parameter study varying galaxy properties...
Continuous star formation in gas-rich dwarf galaxies (2004)
Blue Compact Dwarf and Dwarf Irregular galaxies are generally believed to be unevolved objects, due to their blue colors, compact appearance and large gas fractions. Many of these objects show an...
Massive stars and the energy balance of the ISM: I. The imapct of an isolated 60 M star (2004)
Yorke, H. W., Freyer, T., Hensler, G.
We present results of numerical simulations carried out with a 2D radiation hydrodynamics code in order to study the impact of massive stars on their surrounding interstellar medium. This first paper...
Chemical enrichment and star formation in the Milky Way disk III. Chemodynamical constraints (2004)
Rocha-Pinto, H. J., Flynn, C., Scalo, J., Hanninen, J., Maciel, W. J., Hensler, G.
In this paper, we investigate some chemokinematical properties of the Milky Way disk, by using a sample composed by 424 late-type dwarfs. We show that the velocity dispersion of a stellar group...
Modelling Galaxies with a Multi-Phase ISM in 3d (2004)
Harfst, S., Theis, C., Hensler, G.
We present a modified TREESPH code to model galaxies in 3d. The model includes a multi-phase description of the interstellar medium which combines two numerical techniques. A diffuse warm/hot gas...
G. Hensler, Ch. Theis, J. S. Gallagher
Abstract. Here we present as an extension to already published models of massive spherical galaxies one-dimensional chemodynamical models of dwarf elliptical galaxies in the mass range between 10 9...
Physical Processes in Star-Gas Systems (2003)
Spurzem, R., Berczik, P., Hensler, G., Theis, Ch., Amaro-Seoane, P., Freitag, M., ...
First we present a recently developed 3D chemodynamical code for galaxy evolution from the K**2 collaboration. It follows the evolution of all components of a galaxy such as dark matter, stars,...
Star Formation in a Multi-Phase ISM (2003)
Harfst, S., Theis, Ch., Hensler, G.
We present a 3d code for the dynamical evolution of a multi-phase interstellar medium (ISM) coupled to stars via star formation (SF) and feedback processes. The multi-phase ISM consists of clouds...
Chemo-dynamical Evolution of the ISM in Galaxies (2003)
Harfst, S., Hensler, G., Theis, Ch.
Chemo-dynamical models have been introduced in the late eighties and are a generally accepted tool for understanding galaxy evolution. They have been successfully applied to one-dimensional problems,...
A Multi-Phase Chemo-Dynamical SPH Code for Galaxy Evolution (2003)
Berczik, P., Hensler, G., Theis, Ch., Spurzem, R.
In this paper we present some test results of our newly developed Multi-Phase Chemo-Dynamical Smoothed Particle Hydrodynamics (MP- CD-SPH) code for galaxy evolution. At first, we present a test of...
An X-ray halo in the "hot-spot" galaxy NGC 2903 (2003)
Tschoke, D., Hensler, G., Junkes, N.
In this paper we present ROSAT PSPC and HRI observations of the "hot-spot" galaxy NGC 2903. This isolated system strikingly reveals a soft extended X-ray feature reaching in north-west direction up...
Chemodynamical Modeling of Dwarf Galaxy Evolution (2002)
Berczik, P., Hensler, G., Theis, Ch., Spurzem, R.
We present our recently developed 3-dimensional chemodynamical code for galaxy evolution. It follows the evolution of all components of a galaxy such as dark matter, stars, molecular clouds and...
Chemodynamical Modelling of Galaxy Formation and Evolution (2001)
Berczik, P., Hensler, G., Theis, Ch., Spurzem, R.
We present our recently developed 3-dimensional chemodynamical code for galaxy evolution. This code follows the evolution of different galactic components like stars, dark matter and different...
X-rays from the barred galaxy NGC 4303 (2000)
Tsch"oke, D., Hensler, G., Junkes, N.
The late-type galaxy NGC 4303 (M61) is one of the most intensively studied barred galaxies in the Virgo Cluster. Its prominent enhanced star formation throughout large areas of the disk can be nicely...
ROSAT X-ray observations of Central Galactic Starbursts (1999)
We present spatial and spectral results of ROSAT observations of two galaxies: NGC 4569 and NGC 4303. Both objects are members of the Virgo Cluster and have nearby smaller companions with which they...
Tsch"oke, D., Hensler, G., Junkes, N.
We present X-ray observations of the interacting pair of galaxies NGC 4410a/b with the ROSAT HRI and PSPC. The ROSAT HRI images reveal a point-like source corresponding to NGC 4410a and an X-ray...
Chemical Abundance Ratios and Gas-Phase Mixing in Dwarf Galaxy Evolution (1998)
Because of their low gravitational energies dwarf galaxies are greatly exposed to energetical influences by the interstellar medium, like e.g.\ stellar radiation, winds or explosions, or by their...
Chemical Evolution of Galaxies and the Relevance of Gas Processes (1998)
Since stellar populations enhance particular element abundances according to the yields and lifetimes of the stellar progenitors, the chemical evolution of galaxies serves as one of the key tools...
The Exceptionally Soft X-ray Spectrum of the Low-mass Starburst Galaxy NGC 1705 (1998)
Hensler, G., Dickow, R., Junkes, N., Gallagher, J. S.
NGC 1705 is one of the optically brightest and best studied dwarf galaxies. It appears to be in the late stage of a major starburst and contains a young super star cluster. Type II supernovae are...
Condensation and Evaporation of Interstellar Clouds in Chemodynamical Models of Galaxies (1997)
K"oppen, J., Theis, Ch., Hensler, G.
The network of interactions between hot gas, cool clouds, massive stars, and stellar remnants used in the chemodynamical modeling of the interstellar medium is investigated for the types of its...
Fragmentation of Expanding Shells in Spiral and Irregular Galaxies (1997)
Ehlerova, S., Palous, J., Theis, Ch., Hensler, G.
Conditions for the fragmentation of expanding shells due to gravitational instability are discussed. The self-similar analytical solution is compared with the results of 3-dimensional computer...
TIME-RESOLVED AND POLARIZED EMISSION SPECTROSCOPY OF SINGLE-CRYSTAL [Ru(bpy)3](PF6) (1985)
Yersin, H., Gallhuber, E., Hensler, G.
The lowest excited states of [Ru(bpy)3](PF6)2 single crystals are investigated by a detailed analysis of the temperature dependence of the polarized emissions (down to 1.6 K). It is possible to...
TIME-RESOLVED AND POLARIZED EMISSION SPECTROSCOPY OF SINGLE-CRYSTAL [Ru(bpy)3](PF6) (1985)
Yersin, H., Gallhuber, E., Hensler, G.
The lowest excited states of [Ru(bpy)3](PF6)2 single crystals are investigated by a detailed analysis of the temperature dependence of the polarized emissions (down to 1.6 K). It is possible to...
TIME-RESOLVED AND POLARIZED EMISSION SPECTROSCOPY OF SINGLE-CRYSTAL [Ru(bpy)3](PF6) (1985)
Yersin, H., Gallhuber, E., Hensler, G.
The lowest excited states of [Ru(bpy)3](PF6)2 single crystals are investigated by a detailed analysis of the temperature dependence of the polarized emissions (down to 1.6 K). It is possible to...
TIME-RESOLVED AND POLARIZED EMISSION SPECTROSCOPY OF SINGLE-CRYSTAL [Ru(bpy)3](PF6) (1985)
Yersin, H., Gallhuber, E., Hensler, G.
The lowest excited states of [Ru(bpy)3](PF6)2 single crystals are investigated by a detailed analysis of the temperature dependence of the polarized emissions (down to 1.6 K). It is possible to...
TIME-RESOLVED AND POLARIZED EMISSION SPECTROSCOPY OF SINGLE-CRYSTAL [Ru(bpy)3](PF6) (1985)
Yersin, H., Gallhuber, E., Hensler, G.
The lowest excited states of [Ru(bpy)3](PF6)2 single crystals are investigated by a detailed analysis of the temperature dependence of the polarized emissions (down to 1.6 K). It is possible to...