Jena 2013 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 1: Astrophysik

EP 1.3: Vortrag

Montag, 25. Februar 2013, 14:45–15:00, HS 9

Cosmic Rays and Magnetic Fields in Halos of Spiral Galaxies — •Ralf-Juergen Dettmar — Ruhr-Universitaet Bochum

The distribution of cosmic rays and the structure of magnetic fields in halos of galaxies can be deduced from radiocontinuum polarization observations of the synchrotron radiation caused by cosmic ray electrons gyrating in the interstellar magnetic field. Recent advances in radioastronomical receiver technology have allowed for significant upgrades of major radio facilities such as the Westerbork Synthesis Radio Telescope (WSRT) or the Jansky Very Large Array (JVLA).

We report first results from observations of edge-on galaxies obtained with the new broad-band receivers. These new receivers not only provide higher sensitivity due to the increase in bandwidth, the large number of available frequency channels in the different bandpasses also allows for new analyses methods such as "Rotation Measure (RM) Synthesis".

The results for some prototypical galaxies with extended gaseous halos like NGC4631, M82, and NGC3079 will be presented and discussed in the context of cosmic ray propagation and magnetic field structure and generation.