Milli-arcsec Registration of Nuclear Optical and Radio Structures in the Seyferts NGC 1068 and NGC 4151

Details Milli-arcsec Registration of Nuclear Optical and Radio Structures in the Seyferts NGC 1068 and NGC 4151 Milli-arcsec Registration of Nuclear Optical and Radio Structures in the Seyferts NGC 1068 and NGC 4151

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9503n&link_type=abstract

HST Proposal ID #9503

Computer Science

Hst Proposal Id #9503

Scientific paper

We propose to obtain accurate {as good as 15 milli-arcsec} absolute positions for the complex optical continuum and emission-line structures in the nuclei of NGC 1068 and NGC 4151, by bootstrapping positions from Hipparcos catalog stars in the same ACS/WFC field-of-view. This will also allow us to obtain accurate absolute positions for the central engine - as traced by HST imaging polarimetry in NGC 1068, and by kinematics of emission-line clouds in NGC 4151. The absolute positions of the optical features will be compared with those of the complex milli-arcsec-scale nuclear radio structures in order to: {a} identify the radio component corresponding to the central engine or determine if it is absorbed; {b} use the central engine position, in conjunction with already determined nuclear radio structure and free-free- and H I- absorption to the nuclear radio sources, to construct a more accurate model for the central engine and obscuring torus in AGN; {c} look for detailed correlations {or lack thereof} between the radio jets and the emission-line gas at the milli- arcsec level. An absolute position determination makes all prior and future HST observations of these galaxies more useful. Prompt observations are required as the position uncertainties of the Hipparcos stars are increasing with time. In case of technical problems with ACS, the goals of the project can be achieved with WFPC2 imaging.

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