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In order to better determine the large-scale 3D-structure of magnetic fieldsin spiral galaxies we present a Faraday rotation analysis of the edge-on spiralgalaxy NGC 5775. Deep radio-continuum observations in total power and linearpolarization were performed at 8.46 GHz with the VLA and the 100-m Effelsbergtelescope. They were analyzed together with archival 4.86 and 1.49 GHzVLA-data. We thus can derive rotation measures from a comparison of threefrequencies and determine the intrinsic magnetic field structure. A veryextended halo is detected in NGC 5775, with magnetic field lines forming anX-shaped structure. Close to the galactic disk the magnetic field isplane-parallel. The scaleheights of the radio emission esimated for NGC 5775are comaprable with other galaxies. The rotation measure distribution variessmoothly on both sides along the major axis from positive to negative values.From the derived distribution of rotation measures and the plane-parallelintrinsic magnetic field orientation along the galactic midplane we concludethat NGC 5775 has an 'even axisymmetric' large-scale magnetic fieldconfiguration in the disk as generated by an \alpha \Omega -dynamo which isaccompanied by a quadrupolar poloidal field. The magnetic field lines of theplane-parallel component are pointing 'outwards'. The observed X-shaped halomagnetic field, however, cannot be explained by the action of the disk'smean-field dynamo alone. It is probably due to the influence of the galacticwind together with the dynamo action.

The large scale magnetic field structure of the spiral galaxy NGC 5775