Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pasp...96..593n&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 96, Aug. 1984, p. 593-597.
Astronomy and Astrophysics
Astronomy
32
Astronomical Spectroscopy, Nebulae, Photoionization, Astronomical Models, Line Spectra, Quasars
Scientific paper
The emission-line predictions of several independent photoionization codes are compared and it is shown that details of the techniques and assumptions made in calculating such models do not strongly affect the results. Such predictions are both non-controversial and reliable. An outline is presented of the basic processes which must be included in modern models, and the He II L-alpha transfer problem is identified as one of the major sources of uncertainty in models today. Given the present atomic data base, accuracies better than 10 percent are easily attainable even for the relatively complicated conditions in quasars' clouds. A comparison with models computed nearly a decade ago shows that, even with dramatic changes in many atomic rate coefficients, strong lines are predicted with accuracies better than 30 percent.
Ferland Gary J.
Netzer Hagai
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