Subparsec-scale radio structure in NGC 1275 - Complex structure in the vicinity of the central engine

Abstract

view Abstract Citations (25) References (37) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Subparsec-Scale Radio Structure in NGC 1275: Complex Structure in the Vicinity of the Central Engine Venturi, T. ; Readhead, A. C. S. ; Marr, J. M. ; Backer, D. C. Abstract We present a detailed reanalysis of a series of observations of NGC 1275 at 22.23 GHz, which reveals remarkable new structures on both the scales 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" cm over the period of 1 yr covered by the observations. A persistent feature of this region is a ridge of emission extending to the north. At a distance 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 of 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- brightened 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 surface of this cone. Great care was taken in the analysis to make the best possible images from these observations, and detailed model fitting was found to be invaluable to the hybrid mapping procedure, given the complexity of the object and the limitations of the data. The dynamics of the region within 10^18^ cm of the nucleus is probably dominated by the gravitational potential of the central engine in which case these observations likely provide detailed and reliable multi-epoch models of the radio emission regions within the dynamical realm of a supermassive black hole. Publication: The Astrophysical Journal Pub Date: July 1993 DOI: 10.1086/172857 Bibcode: 1993ApJ...411..552V Keywords: Black Holes (Astronomy); Galactic Clusters; Galactic Nuclei; Galactic Structure; Radio Emission; Seyfert Galaxies; Elliptical Galaxies; Gravitational Fields; Radio Galaxies; Spiral Galaxies; Astrophysics; GALAXIES: KINEMATICS AND DYNAMICS; GALAXIES: NUCLEI; RADIO CONTINUUM: GALAXIES full text sources ADS | data products SIMBAD (1) NED (1)