IMAGING SPECTROPHOTOMETRY OF MARKARIAN-573

Narrowband emission-line and continuum images obtained in subarcsecond seeing conditions are presented for the Seyfert 2 galaxy, Markarian 5 73. Images in the emission lines of [O I], [O II], [O III], [S II], an d H alpha + [N II] are used to measure the structure and excitation in the extended emission regions surrounding the active nucleus. The bic onical region contains a variety of complex features, including two ar clike structures within similar to 2 '' of the active nucleus that app ear to be associated with the extended radio continuum emission in the sense that the radio lobes lie just inside the centroids of the emiss ion-line arcs. These arcs probably arise from an interaction between t he ISM and the radio plasma from the active nucleus. Two other emissio n-line features he similar to 3 ''-4 '' on either side of the nucleus, and appear to be elongated nearly perpendicular to the symmetry axis of the inner radio and optical structures. The existence of multiple e mission-line components could be evidence for episodic ejection of rad io plasma from the active nucleus.