Spatially Resolved Far - Ultraviolet Spectroscopy of the Nuclear Region of NGC 1068 1

We carry out high-resolution FUSE spectroscopy of the nuclear region of NGC 1068. The first set of spectra was obtained with a 30 square aperture that collects all emission from the narrow-line region. The data reveal a strong broad O VI component of FWHM ∼ 3500 kms and two narrow O VI λλ1031/1037 components of ∼ 350 kms. The C III λ977 and N III λ991 emission lines in this spectrum can be fitted with a narrow component of FWHM ∼ 1000 kms and a broad one of ∼ 2500 kms. Another set of seven spatially resolved spectra were made using a long slit of 1. 25×20, at steps of∼ 1 along the axis of the emissionline cone. We find that (1) Major emission lines in the FUSE wavelength range consist of a broad and a narrow component; (2) There is a gradient in the velocity field for the narrow O VI component of ∼ 200 kms from ∼ 2 southwest of the nucleus to ∼ 4 northeast. A similar pattern is also observed with the broad O VI component, with a gradient of ∼ 3000 kms. These are consistent with 1 Based on observations made with the NASA-CNES-CSA Far Ultraviolet Spectroscopic Explorer (FUSE), which is operated for NASA by the Johns Hopkins University under NASA contract NAS5-32985, and observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities of Research in Astronomy, Inc., under NASA contract NAS5-26555. Center for Astrophysical Sciences, Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218 Center for Astrophysics, University of Science and Technology of China, Hefei, Anhui, 230026, China Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 5 Observatoire de Strasbourg, 67000 Strasbourg, France 6 Mount Stromlo & Siding Spring Observatories, Australian National University, ACT 2611, Australia NASA Headquarters, Washington, DC 20546-0001