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Locally Optimally-Emitting Clouds and the Variable Broad Emission Line Spectrum of NGC 5548 | | Kirk T. Korista
; Michael R. Goad
; | | Date: |
24 Dec 1999 | | Subject: | astro-ph | | Affiliation: | WMU), Michael R. Goad (Univ. Leicester | | Abstract: | [abridged] We test the ``locally optimally-emitting clouds’’ (LOC) model against the extensive spectroscopic data base of the Seyfert~1, NGC 5548. The time-averaged, integrated-light UV broad emission line spectrum from the 1993 {em HST} monitoring campaign is reproduced via the optimization of three global geometric parameters: the outer radius, the index controlling the radial cloud covering fraction of the continuum source, and the integrated cloud covering fraction. We make an {em ad~hoc} selection from the range of successful models, and for a simple spherical BLR geometry we simulate the emission line light curves for the 1989 {em IUE} and 1993 {em HST} campaigns, using the respective observed UV continuum light curves as drivers. We find good agreement between the predicted and observed light curves and lags --- a demonstration of the LOC picture’s viability as a means to understanding the BLR environment. Finally, we discuss the next step in developing the LOC picture which involves the marriage of echo-mapping techniques with spectral simulation grids such as those presented here, using the constraints provided by a high quality, temporally well-sampled spectroscopic data set. | | Source: | arXiv, astro-ph/0001399 | | Services: | Forum | Review | PDF | Favorites | |
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