SUBPARSEC-SCALE RADIO STRUCTURE IN NGC-1275 - COMPLEX STRUCTURE IN THE VICINITY OF THE CENTRAL ENGINE

We present a detailed reanalysis of a series of observations of NGC 12 75 at 22.23 GHz, which reveals remarkable new structures on both the s cales 10(17)-10(18) and 10(18)-10(19) CM . On the scale 10(17)-10(18) cm a complex configuration is found in which the relative positions of the components appear to have changed by less than 10(17) cm over the period of 1 yr covered by the observations. A persistent feature of t his region is a ridge of emission extending to the north. At a distanc e of 1.3 x 10(18) cm from the northern extreme of the source there is an abrupt change in structure accompanied by a drop of over a factor o f 30 in surface brightness, and from this point there is an outflow of material at (0.6 +/- 0.2)c-for H-0 = 75 km s -1 Mpc-1-into a limb-bri ghtened cone of emitting material which extends 10(19) cm to the south . Correlated bright regions on opposite sides of the cone suggest that most of the radio emission originates in a helical filament on the su rface of this cone. Great care was taken in the analysis to make the b est possible images from these observations, and detailed model fittin g was found to be invaluable to the hybrid mapping procedure, given th e complexity of the object and the limitations of the data. The dynami cs of the region within 10(18) cm of the nucleus is probably dominated by the gravitational potential of the central engine in which case th ese observations likely provide detailed and reliable multi-epoch mode ls of the radio emission regions within the dynamical realm of a super massive black hole.