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EVIDENCE FOR A NEW SUPERWIND GALAXY - NGC 4666

Multi-wavelength observations of the edge-on galaxy NGC4666 have led to the detection of an outflow cone associated with a galactic superwind, emanating from a central starburst with a radial diameter of about 6.5 kpc. The outflow is traced up to 7.5 kpc above the plane by optical emission line l- aments,nonthermalradiocontinuumemission,associatedmag- netic elds perpendicular to the galactic plane, and soft X-ray emission from hot gas. Optical spectroscopy exhibits the kine- matic signature of an outflow and the observed line ratios indi- cate that shock heating is the most likely excitation mechanism for the emission line gas. The outflow is well approximated by a 6.5 kpc base (the extent of the central starburst) plus a cone with an opening angle of 30 10. In the outer disk of NGC4666 numerous luminous Hii re- gions were detected, which lead to additional outflows (galactic fountains or chimneys) of gas into the halo. Radially the radio halo is much more extended than the central outflow cone and it has an exponential z-scale height at 1.43 GHz of 1:7 0:28 kpc. NGC4666 is in many respects very similar to NGC4631, another edge-on galaxy with an extended gaseous halo.