Parts | Days | Selection | Search | Downloads | Help

EP: Fachverband Extraterrestrische Physik

EP 6: Astrophysics

EP 6.6: Talk

Tuesday, March 31, 2009, 16:35–16:50, Zahnklinik

Cosmic rays and magnetic fields in the halo of the spiral galaxy NGC253 — •Ralf-Jürgen Dettmar¹, Volker Heesen¹, Marita Krause², and Rainer Beck² — ¹Astronomisches Institut, Ruhr-Universität Bochum — ²Max-Planck-Institut für Radioastronomie Bonn

A radio continuum study at four wavelengths including a new high resolution VLA mosaic map at 6cm allows us to describe the transport of cosmic rays in the nearby starburst galaxy NGC253. Typical bulk velocities for cosmic rays are derived which are close to the escape velocity of the galaxy studied. From the polarized emission it is also possible to constrain the large scale structure of the magnetic field. A significant poloidal halo component is inferred from models of the magnetic field in the disk.