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7 papers · 2 filters
Observations of planetary nebulae in the Galactic Bulge
F. Cuisinier, W. J. Maciel, J. Köppen +2
High quality spectrophotometric observations of 30 Planetary Nebulae in the Galactic Bulge have been made. Accurate reddenings, plasma parameters, and abundances of He,O,N,S,Ar,Cl…
Modeling Interacting Galaxies Using a Parallel Genetic Algorithm
Christian Theis, Stefan Harfst
Modeling of interacting galaxies suffers from an extended parameter space prohibiting traditional grid based search strategies. As an alternative approach a combination of a Geneti…
Chemical Evolution of Dwarf Irregular Galaxies - chemodynamical models and the effect of gas infall
Gerhard Hensler, Andreas Rieschick, Joachim K"oppen
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 explosion…
Modeling Encounters of Galaxies: The Case of NGC4449
Christian Theis
(abridged) Several N-body methods were combined in order to develop a method for the determination of the parameters of interacting galaxies. This method has been applied to the HI…
Global Spiral Modes in Star-Forming Gravitating Disks
Vladimir Korchagin, Christian Theis
Using 2D nonlinear simulations, we study the generation and nonlinear evolution of spiral structure in a star-forming multi-component gravitating disk. We confirm in agreement with…
TeV Gamma-ray Observations of the Crab and Mkn 501 during Moonshine and Twilight
D. Kranich, R. Mirzoyan, D. Petry +1
TeV Gamma-ray signals from the Crab Nebula and Mkn 501 were detected with the HEGRA CT1 imaging Cerenkov telescope during periods when the moon was shining and during twilight. Thi…