Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...20114601k&link_type=abstract
American Astronomical Society Meeting 201, #146.01; Bulletin of the American Astronomical Society, Vol. 35, p.571
Other
Scientific paper
Over the past three years, the Far Ultraviolet Spectroscopic Explorer (FUSE) has obtained 87 spectra of 56 low-redshift (z<0.15) active galactic nuclei (AGN). This sample comprises 53 Type 1 AGN and 3 Type 2. All the Type 1 objects show broad O VI 1034 emission; two of the Type 2s show narrow O VI emission. In addition to O VI, we also identify emission lines due to C III 977, N III 991, S IV 1062,1072,1073, and He II 1085 in many of the Type-1 AGN. Of the Type 1 objects, 30 show intrinsic absorption by the O VI 1032,1038 doublet. Most of these intrinsic absorption systems show multiple components with intrinsic widths of 100 km/s spread over a blue-shifted velocity range of less than 1000 km/s. With the exception of three galaxies (Ton S180, Mrk 478, and Mrk 279), those galaxies in our sample with existing X-ray or longer wavelength UV observations also show C IV absorption and evidence of a soft X-ray warm absorber. In some cases, a UV absorption component has physical properties similar to the X-ray absorbing gas, but in others there is no clear physical correspondence between the UV and X-ray absorbing components. Models in which a thermally driven wind evaporates material from the obscuring torus naturally produce such inhomogeneous flows. Material spanning a broad range of temperatures co-exists in pressure equilibrium. Thus diffuse, highly ionized gas causing X-ray absorption can co-exist with more densely clumped, lower-temperature gas that forms UV absorption lines.
This work is based on data obtained for the Guaranteed Time Team by the NASA-CNES-CSA FUSE mission operated by the Johns Hopkins University. Financial support to U. S. participants has been provided by NASA contract NAS5-32985.
Alexander Tal
Brotherton Michael
Green Richard F.
Hutchings John
Kaiser Mary Elizabeth
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