A Detailed Photoionization Study of the Broad Line Region of NGC 5548

Details A Detailed Photoionization Study of the Broad Line Region of NGC 5548 A Detailed Photoionization Study of the Broad Line Region of NGC 5548

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9926g&link_type=abstract

HST Proposal ID #9926

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Hst Proposal Id #9926 Agn/Quasars

Scientific paper

NGC 5548 probably has the best-studied broad line region {BLR} of any AGN. It therefore provides an excellent laboratory for investigating many fundamental BLR questions. We propose to use the large set of HST NGC 5548 spectra taken in 1993 to {a} test photoionization analyzes of BLR clouds, {b} attempt to unravel the various emission line components, and {c} understand how the BLR gas is moving. This data set is uniquely suited to this because of the excellent sampling, high signal-to-noise ratio and large sample of contemporaneous optical spectra available. Because we know the distribution of the BLR gas in NGC 5548 better than in any other AGN and because the multi-wavelength variability history is known, many major uncertainties in previous BLR studies are greatly reduced. We will be using Gary Ferland's photoionization code ``CLOUDY'' to derive physical conditions as a function of both projected velocity and time. The key ingredient in our proposed study is requiring consistency in derived conditions as NGC 5548 varied in continuum and line strength by almost a factor of two during the 1993 monitoring. From this we hope to be able to separate out the various kinematic components and understand the gas motions. We are particularly interested in evaluating disk and disk-plus-wind models

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