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S.B. Kraemer (Catholic University/NASA's GSFC), D.M. Crenshaw (Georgia State University), I.M. George (UMBC/NASA's GSFC), H. Netzer (Tel-Aviv University), T.J. Turner (UMBC/NASA's GSFC)
We have examined the physical conditions in the intrinsic UV absorbing gas in the Seyfert 1.5 galaxy NGC 3516, using echelle spectra obtained with the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope on 2000 October 1. We confirm the presence of the 4 kinematic components detected in earlier Goddard High Resolution Spectrograph (GHRS) spectra, as well as 4 new absorption features with radial velocities ranging from -692 to -1372 km s-1. The C IV column densities of components 3 and 4 appear to have increased significantly compared to the GHRS epoch. Based on photoionization modeling and our analysis of contemporaneous Chandra X-ray Observatory spectra, we argue that these changes are in response to the drop in ionizing flux.
The author(s) of this abstract have provided an email address for comments about the abstract: kraemer@yancey.gsfc.nasa.gov