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We have the unique opportunity to observe and model nearby streams around the two large Local Group spirals Milky Way and M31 in great detail. However, the detection of streams around other external galaxies is required to verify the general application of the derived results. We give a short summary of streams around other galaxies known in the

The evolution of exploding granules is studied by using a spatially as well as temporally highly resolved time series of white-light images of 80 minute duration. The results of this study show that the dynamics of exploding granules is strongly affected by their surroundings and that their appearance is closely related to the mesogranular flow

The central engines of Seyfert galaxies are thought to be enshrouded by geometrically thick gas and dust structures. In this paper, we derive observable properties for a self-consistent model of such toroidal gas and dust distributions, where the geometrical thickness is achieved and maintained with the help of X-ray heating and radiation pressure

We study the evolution of galaxy structure and of the major merger fraction since z ˜ 1 to present in GOODS-S field for MB ≤ -20 and M* ≥ 1010 Msun selected galaxies. We segregate the galaxies into early-type galaxies (ET, E/S0/Sa), and late-type galaxies (LT, Sb-Irr) by their position in the concentration-asymmetry plane, while we pick up high

Does a merging event always precede AGN activity? In this starting PhD project, we will try to address this question by quantifying the distortions and interaction signatures that can be detected on a sample of AGN galaxies from the ACS-COSMOS survey. In order to do this, we will investigate and combine all the different available galaxy