THE NUCLEAR HIGH-EXCITATION OUTFLOW CONE IN NGC-1365

The conical structure of nuclear high excitation gas in the Seyfert 1. 5 galaxy NGC 1365 has been studied in terms of morphology and kinemati cs. The observations considered are narrow-band images in [O III] lamb da 5007 and in H alpha (Jorsater et al. 1995), as well as long slit sp ectra obtained at different orientations over the galaxy (P.O. Lindbla d et al. 1995). The [O III] lambda 5007 image shows a conical structur e that does not have any resemblance with the H alpha image. While the H alpha, H beta, [N II] lambda 6548, lambda 6583 and [S II] lambda 67 16, lambda 6731 spectral lines show the galactic rotation, perturbed b y the bar, of the disc gas, the [O III] lambda 4959, lambda 5007 and [ Ne III] lambda 3869 lines establish a completely different velocity fi eld. Sometimes the emission lines are split. We present a kinematic mo del of this peculiar velocity field in terms of an accelerated outflow in a hollow biconical structure seen projected against the emission d isc, and derive geometric and kinematic parameters for the outflow. Th e cone axis of our model is directed closely along the rotation axis o f the galaxy as a whole. The opening angle of 100 degrees of the cone is such that the line of sight to the partially obscured Seyfert nucle us falls just inside the cone. The accelerated radial outflow has a ma ximum on the cone axis. A counter cone is seen partially obscured by t he galactic disc. The cone is in projection aligned with a 5 '' long, one-sided jet-like radio structure emanating from the nucleus. Reasons for the one-sidedness of this possible jet is briefly discussed. Diag nostic line ratios for the cone fall in an interval occupied by narrow line regions in AGNs.