SUB-ARCSECOND RESOLUTION 2D (X,Y,LAMBDA) SPECTROGRAPHY OF THE EMISSION-LINE REGION OF NGC-5929 WITH TIGER

We report observations of the Seyfert 2 galaxy NGC 5929 with the integ ral field spectrograph TIGER. These 2D spectrographic data, with sub-a rcsecond spatial resolution, consist of 394 flux-calibrated spectra, c overing the [NII], H alpha and [S II] emission associated with the two radio-lobes. The two optical line emission components have been kinem atically separated using Gaussian fitting of the spectra. From this de composition, we have derived line intensities, ratios and velocities f or each component. Although the line-of-sight velocities of the clouds are consistent with normal rotational motions, their high internal ve locity dispersions and spatial association with the radio components c learly indicate an interaction between the radio ejecta and the ambien t medium. We discuss four specific models describing this interaction but conclude that none of them is completely satisfactory.