AAS 197, January 2001
Session 109. AGN Host Galaxies
Display, Thursday, January 11, 2001, 9:30-4:00pm, Exhibit Hall

[Previous] | [Session 109] | [Next]

[109.11] Intrinsic Ultraviolet Absorption in the Seyfert\,1 Galaxy NGC\,3783

M.E. Kaiser (JHU), G.A. Kriss (STScI), K.R. Sembach, W.R. Oegerle, A.F. Davidsen, S.D. Friedman, W. Zheng (JHU), R.F Green, M. Brotherton (NOAO), B. Woodgate (NASA/GSFC), J.B. Hutchings (NRC/HIA), J.M. Shull (Colorado), D.G. York (Chicago)

We present ultraviolet spectra of the z=0.010 Seyfert\,1 galaxy NGC\,3783. For wavelengths extending from 920-1185\,Å~we have obtained high spectral resolution, ~,20\,km\,s-1, observations with the {\em Far Ultraviolet Spectroscopic Explorer (FUSE)}. These data are complemented by longer wavelength, 1145-3145\,Å, lower resolution Space Telescope Imaging Spectrograph (STIS) spectra. The {\em FUSE} and STIS observations were made within three months of one another. Our {\em FUSE} spectra exhibit both strong O\,VI emission and strong associated absorption lines of O\,VI \lambda\lambda1032, 1038 as well as Lyman\,\beta emission and associated absorption. Lyman\,\alpha, N\,V\lambda1240, Si\,IV\,\lambda1398, C\,IV \lambda1549, C\,III] \lambda1909 and Mg\,II\,\lambda2800 emission are detected in the low resolution STIS spectra.

NGC\,3783 is one of several Seyfert\,1 galaxies which exhibit deep O\,VII and O\,VIII absorption edges in the X-ray and intrinsic absorption in the ultraviolet. {\em FUSE} observations of O\,VI are important for characterizing the ionization state of this warm X-ray absorbing gas and providing a link between the lower ionization species, such as N\,V and C\,IV, seen in the ultraviolet and the higher ionization X-ray warm absorber. We will discuss the intrinsic absorption present in both our {\em FUSE} and STIS spectra. These kinematic components will be compared with the components present in the {\em Chandra} X-ray observations (Kaspi et al. 2000, ApJ) and the earlier {\em HST}/GHRS/FOS spectra (Crenshaw et al. 1999, ApJ).

The {\em FUSE} observations were obtained for the Guaranteed Time Team. Financial support for these observations was provided by contract NAS5-32985.

[Previous] | [Session 109] | [Next]