Prof. Dr. Ralf-Jürgen Dettmar

Ruhr-University Bochum

The Evolution of Spiral Galaxies

The characteristic shape of spiral galaxies which allows for a picturesque manifold of different individual structures is not only one of the typical features frequently shown in many color photographs taken with modern astronomical telescopes, to explain the origin of the overall shape of galaxies is also one of the most challenging question for astrophysics today.

The talk will introduce to the rich morphology in the world of galaxies and will try to fit our Milky Way Galaxy into this picture. One such typical structure of a spiral or disk galaxy is the central elongated stellar mass distribution called "bar". It is shown that our Galaxy contains such a stucture, too. Starting with the most famous "deepest" image of the Universe, the so-called Hubble Deep Field (HDF), the concept of hirarchical structure formation and the role of merging and interaction is introduced. Comparing objects in the HDF with galaxies in our local Universe however reveals, that not all the structures observed today have been present since the formation of galaxies. It is rather demonstrated that some typical characteristics of spiral galaxies such as bars grow with time by intrinsic processes.

All these different aspects of galaxy formation aim at a better understanding of the relation between dark and baryonic matter in a more general evolutionary description of the Universe.

15. Mitglieder laden Mitglieder ein
ZOOM-Meeting | 13. Nov. 2021

Treffen der Regionalgruppe

ZOOM-Meeting | 17. Nov. 2021

Neues vom Club 02/2021

JSPS-Club bei der Nippon Connection
Die Deutsche Gesellschaft der JSPS-Stipendiaten e.V. (JSPS-Club) und das JSPS Bonn Office stellen sich beim Nippon Connection Filmfestival vor.


„Orden der Aufgehenden Sonne am Halsband, goldene Strahlen“ (旭日中綬章) der japanischen Regierung für Club-Mitglieder Prof. Dr. Werner Pascha und Prof. Dr. Peter Hennicke