Crosses mark the centers of the two galaxies.
The total column density neutral hydrogen map is shown in colour and the contours are of the 20cm radio continuum emission. Kpc scale HI arcs are seen above the plane of NGC 5775 as well as a large radio continuum halo extending to approximately 16 kpc with significant substructure. Recently, it has become clear that spiral galaxies can experience outflows, not only outflows from active nuclei, but also from their disks, with the latter likely due to star forming activity. Moreover, it is not yet clear what the triggers of such activity are, since not all galaxies experience such outflows. Therefore telescopes like the Very Large Array, the James Clerk Maxwell Telescope, and the Nobeyama Mm-wave Array have been used.