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K. Forster, P.J. Green, I.N. Evans (SAO), A.P. Koratkar (STScI), T.L. Aldcroft (SAO)
We describe a study of the relationships between the broadband spectral energy distribution in AGN and their emission and absorption line properties. The study combines HST FOS observations of a sample of 450 AGN with ROSAT PSPC observations and includes all classes AGN. The Hubble/ROSAT Continuum and Ultraviolet Line Emission Study (H/RCULES) of AGN enables characterization of:
\bullet Spectral energy distributions from X-ray to Radio.
\bullet Emission line properties.
\bullet UV and X-ray absorption.
\bullet is there Luminosity dependence of absorption?
The FOS observations consist of both pre and post-COSTAR spectra, the pre-COSTAR spectra will appear in a complete atlas of recalibrated HST FOS spectra of AGN (Evans, Koratkar, & Pesto 1999; Koratkar, et al. 1999). The challenge of analyzing such a large sample of AGN spectra is tackled using software developed for the Chandra mission. This also allows an analysis of the combined X-ray-UV-Optical SED. Absorption lines in the UV spectra are identified and measured using FINDSL (Aldcroft 1995) and the Fe~II emission features are fitted using a template generated from the UV spectrum of I~Zw~1 (Vestergaard & Wilkes 1997).
Preliminary results from a study of a sample of 99 objects with pre-COSTAR spectra are presented here. This sub-sample contains proportions of radio-loud (80%) and radio-quiet (20%) objects similar to the full FOS sample. ROSAT PSPC observations are available for approximately half of this sub-sample.
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