Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....6.2378d&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
Scientific paper
We present results of a recent radiocontinuum polarization study of the spiral galaxy NGC 5775 with regard to its large scale magnetic field structure and discuss the influence of the observed magnetic field on cosmic ray propagation. Our analysis is based on Very Large Array data at 4.85 GHz and 1.49 GHz. We found that regular magnetic fields extend beyond 2 kpc from the mid-plane of the galaxy into the halo and possess a substantial component oriented perpendicular to the plane. In particular, the magnetic field forms X-shaped vertical extensions with a field direction parallel to Hα emitting spurs of ionized gas. The analysis of Faraday rotation between the mentioned frequencies suggests a dipolar magnetic field, in agreement with a rigid rotation curve of NGC 5775 which is implied by our Hα velocity field. We suggest that vertical magnetic field components support the gas and cosmic ray transport along the magnetic lines from the disk into the halo. Magnetic reconnection may also contribute to the heating balance for halo gas.
Dettmar Ralf-Juergen
Rossa Joern
Soida Marian
Tuellmann Ralph
Urbanik Marek
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