Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6108k&link_type=abstract
HST Proposal ID #6108
Physics
Hst Proposal Id #6108 Agn
Scientific paper
A significant number of AGN display intrinsic, broad, blueshifted UV absorption lines thought to arise from gas located close to the powerful central engine. The origin and physical properties of the absorbing gas are not well understood, but the absorbing gas has a clear advantage over the emission line gas in that it provides a probe of the nucleus along a well defined line-of-sight. As Seyfert 1 galaxies are believed to be the low luminosity analogues of QSOs, these low luminosity AGN provide a critical comparison source for stringent testing of AGN models. Based on IUE data, NGC 3516 has the strongest {largest equivalent-width} and most variable UV absorption line spectrum of any known Seyfert 1 galaxy. An extensive monitoring campaign of NGC 3516 showed that most of the important diagnostic broad absorption lines were undetectable with IUE. Therefore, we propose UV spectrophotometric monitoring of NGC 3516 with the HST/FOS, in order to conduct a detailed, simultaneous, high signal-to-noise ratio study of the highly variable absorption features which are associated with numerous ionic species. Analysis of the variable absorption line spectrum will constrain the location, density, column density, ionization parameter and velocity structure of the absorbing gas. High quality data on several ionic species will also constrain the broad emission line gas, and in particular the possible influence of a beamed ionizing continuum source which the previous IUE data suggest may affect the emission line cores.
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